Patent Publication Number: US-2020276113-A1

Title: Taste-masked and orally administered pharmaceutical preparation containing varenicline or pharmaceutically acceptable salt thereof

Description:
FIELD 
     The present application claims priority to Korean Patent Application No. 10-2016-0002797 filed on Jan. 8, 2016 in the Republic of Korea, the disclosures of which are incorporated herein by reference. 
     The present disclosure relates to a pharmaceutical preparation having varenicline or a pharmaceutically acceptable salt thereof as an active ingredient. More particularly, it relates to an orally administered pharmaceutical preparation which allows limited use of a sweetening agent or a flavoring agent by effectively masking the unique taste of varenicline, particularly bitterness, which is a bitter and burning taste, and ensures convenience in taking the pharmaceutical preparation by being orally administrable without irritation, while containing a pharmaceutically effective amount of varenicline or a pharmaceutically acceptable salt thereof, and a method for preparing the same. 
     BACKGROUND 
     Varenicline has the following chemical formula: 
     
       
         
         
             
             
         
       
     
     Varenicline is also called 5,8,14-triazatetracyclo[10.3.1.0 2,11 .0 4,9 ]-hexadeca-2(11),3,5,7,9-pentane or 7,8,9,10-tetrahydro-6,10-methano-6H-pyrazino[2,3-h][3]-benzazepine. Varenicline and a pharmaceutically acceptable acid addition salt thereof are mentioned in International Patent Publication No. WO1999/35131. 
     Varenicline binds to the neuronal nicotinic acetylcholine receptor and is useful in regulating cholinergic action. Accordingly, varenicline is useful in treating various conditions or diseases, for example, inflammatory bowel disease (non-limiting examples: ulcerative colitis, pyoderma gangrenosum and Crohn&#39;s disease), irritable bowel syndrome, spasmodic dystonia, chronic pain, acute pain, celiac sprue, pouchitis, vasoconstriction, anxiety, panic disorder, depression, bipolar disorder, autism, sleep disorder, jet lag syndrome, amyotrophic lateral sclerosis (ALS), cognitive impairment, hypertension, bulimia, anorexia, obesity, cardiac arrhythmia, gastric acid hypersecretion, ulcer, pheochromocytoma, progressive supranuclear palsy, drug dependence and addiction (dependence on or addiction to, e.g., nicotine (and (or) tobacco products), alcohol, benzodiazepine, barbiturate, opioid or cocaine), headache, migraine, spasm, traumatic brain injury (TBI), obsessive-compulsive disorder (OCD), psychosis, Huntington&#39;s chorea, tardive dyskinesia, hyperkinesia, alexia, schizophrenia, multi-infarct dementia, age-related cognitive decline, epilepsy (including absence epilepsy), Alzheimer&#39;s disease (AD), Parkinson&#39;s disease (PD), attention deficit hyperactivity disorder (ADHD) and Tourette syndrome. 
     Varenicline tartrate is sold as a 1-mg or 0.5-mg tablet and is used as a smoking cessation aid to treat nicotine addiction or reduce tobacco addiction or consumption. 
     Varenicline can be administered through various routes. When considering the convenience of carrying and medication, it may be provided specifically as an oral formulation, more specifically an intraoral dispersible formulation. However, varenicline has a unique bitterness, i.e., a bitter and burning taste, and may cause an unpleasant sensation when swallowing. The bitterness problem remains unsolved even when varenicline is prepared into a salt (e.g., varenicline tartrate, varenicline salicylate, varenicline sulfate, varenicline fumarate, varenicline oxalate, varenicline hydrochloride, varenicline hydrobromide, varenicline citrate, varenicline maleate, varenicline succinate, varenicline phosphate, varenicline tosylate, varenicline free base and varenicline mesylate). Therefore, it is not easy to be prepared into a formulation for oral administration, particularly an intraoral dispersible formulation whose taste is directly felt during oral administration, e.g., an orally dissolving film, an orally disintegrating tablet, a suspension, a suspension tablet, a rapidly disintegrating tablet, an orally disintegrating capsule, an orally disintegrating granule, an orally disintegrating troche, a sublingual tablet, a powder and/or a chewable tablet. Especially, it is difficult to be used as an active ingredient of an orally administered pharmaceutical preparation for treating a condition or a disease requiring regular medication for a long period of time. 
     There have been attempts to mask the bitterness of varenicline or a pharmaceutically acceptable salt thereof using various ingredients known to have taste masking (TM) effect in the art, such as a sweetening agent, a flavoring agent, etc. However, these ingredients cannot solve the irritation problem during swallowing. Accordingly, development of an orally administered pharmaceutical preparation with the bitterness of varenicline or a pharmaceutically acceptable salt thereof masked is necessary. 
     SUMMARY 
     Technical Problem 
     The present disclosure is directed to providing an orally administered pharmaceutical preparation containing varenicline as an active ingredient, which can be taken regularly for a long period of time by effectively masking the unique bitterness of varenicline and removing irritation during swallowing, thereby effectively masking unpleasant sensation when the pharmaceutical preparation is administered orally, and a method for preparing the same. 
     Technical Solution 
     In order to solve the technical problems described above, the present disclosure provides an orally administered pharmaceutical preparation containing varenicline or a pharmaceutically acceptable salt thereof as an active ingredient and containing both an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as a bitter taste masking agent, a method for preparing the same and a method for treating a subject in need thereof by orally administering the same. 
     The inventors of the present disclosure have identified that, although ion-exchange resins have been used to mask the bitterness of drugs prior to this application, it is difficult to effectively the strong bitterness of varenicline or a salt thereof only with the ion-exchange resins. They have found out that use of an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups in combination is very effective in masking the unique bitterness of varenicline or a pharmaceutically acceptable salt even with a small amount due to their synergy effect, allows the masking of bitterness without using another sweetening agent or flavoring agent and can reduce irritation during swallowing and have completed the present disclosure. 
     In an aspect, the present disclosure provides a bitterness-masked orally administered pharmaceutical preparation containing varenicline or a pharmaceutically acceptable salt thereof as an active ingredient and containing both an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups. 
     In the present disclosure, varenicline or a pharmaceutically acceptable salt thereof is used as an active ingredient. 
     In the present disclosure, the ‘active ingredient’ means a therapeutically active compound, any prodrug thereof or a pharmaceutically acceptable salt or solvate of the compound or the prodrug. 
     In the present disclosure, the ‘varenicline’ includes a parent drug, a prodrug thereof and a pharmaceutically acceptable salt or solvate of the parent drug or the prodrug. The parent drug of varenicline is described in WO99/35131, the disclosures of which are incorporated herein by reference. A method for preparing varenicline is described in U.S. Pat. No. 6,410,550, the disclosures of which are incorporated herein by reference. The resolution of a racemic mixture of varenicline is described in WO01/62736, the disclosures of which are incorporated herein by reference. 
     The pharmaceutical preparation according to the present disclosure may contain, instead of or together with varenicline, a varenicline derivative as an active ingredient. Accordingly, the pharmaceutical preparation according to the present disclosure may contain a derivative having pharmacological activity comparable to that of varenicline. 
     In the present disclosure, ‘pharmaceutically acceptable’ means chemical, physical and/or toxicological compatibility with other ingredients of a composition and/or a mammal treated with the same. 
     In the present disclosure, the ‘pharmaceutically acceptable salt’ refers to a nontoxic acid addition salt derived from an inorganic acid or an organic acid. Adequate salt derivatives include, for example, halide, tosylate, mesylate, thiocyanate, sulfate, bisulfate, sulfite, bisulfite, aryl sulfonate, alkyl sulfate, fumarate, oxalate, phosphonate, phosphate, monohydrogen phosphate, dihydrogen phosphate, metaphosphate, pyrophosphate, alkanoate, cycloalkyl alkanoate, aryl alkanoate, adipate, alginate, aspartate, benzoate, glucoheptanoate, glycerophosphate, lactate, maleate, nicotinate, palmitate, pectinate, picrate, pivalate, succinate, tartrate, citrate, camphorate, camphorsulfonate, digluconate, trifluoroacetate, hydrochloride, hydrobromide, salicylate, etc. and are not limited as long as they are pharmaceutically acceptable salts having the unique bitterness of varenicline. Specifically, the varenicline or a pharmaceutically acceptable salt thereof may be one or more selected from a group consisting of varenicline salicylate, varenicline sulfate, varenicline fumarate, varenicline oxalate, varenicline hydrochloride, varenicline hydrobromide, varenicline citrate, varenicline maleate, varenicline succinate, varenicline phosphate, varenicline tosylate and varenicline mesylate. The acid addition salt may be prepared by a common method. For example, it may be prepared by dissolving the compound in an excess amount of aqueous acid solution and precipitating the salt using a water-miscible organic solvent, e.g., methanol, ethanol, acetone or acetonitrile. After heating the compound and an acid in water or an alcohol, the salt precipitated by evaporating and drying the mixture may be filtered through suction. 
     The active ingredient according to the present disclosure may be varenicline or a pharmaceutically acceptable salt thereof without limitation. Specifically, varenicline salicylate, varenicline sulfate, varenicline fumarate, varenicline oxalate, varenicline hydrochloride, varenicline hydrobromide, varenicline citrate, varenicline maleate, varenicline succinate, varenicline phosphate, varenicline tosylate or varenicline mesylate may be preferred to varenicline tartrate. More specifically, varenicline sulfate, varenicline hydrochloride, varenicline salicylate, varenicline hydrobromide or varenicline free base may be used. Most specifically, varenicline salicylate may be used. Varenicline salicylate is superior in terms of stability against oxidation. 
     In the present disclosure, both the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups are used as bitter taste masking agents. 
     In the present disclosure, the ‘ingredient’ refers to any substance that constitutes a pharmaceutical preparation with varenicline, a prodrug, a pharmaceutically acceptable salt or a solvate thereof, such as an excipient, a plasticizer, a disintegrant, a diluent, a solvent, a penetration enhancer, a preservative, a buffer, a gelator, a lubricant, a carrier, a stabilizer, a gel, a dye, a pigment, a surfactant, an inert filler, an adhesive, a texturizer, a softener, an emulsifier and a mixture thereof. 
     In the present disclosure, as the ‘anionic polymer containing carboxyl groups’, any one which is nontoxic and does not negatively affect the pharmacological activity of varenicline or a pharmaceutically acceptable salt thereof may be used without limitation. Specifically, polyacryls may be used. More specifically, a crosslinked polymer of acrylic acid and divinylbenzene, a crosslinked polymer of methacrylic acid and divinylbenzene (e.g., Kyron-T-104®, Kyron-T-114®, Kyron-T-134® AmberliteIRP64®, AmberliteIRP88®, AmberliteIRC50®, TulsionT339®, TulsionT 335®, Purolite C102DR®, PuroliteC108DR®, PuroliteC115HMR®, PuroliteC115KMR®, INDION204®, INDION214®, INDION234®, INDION234S®, INDION264®, INDION414®, INDION464®, INDION294®, etc., although not being limited thereto) or a copolymer of methacrylic acid and methyl methacrylate (e.g., Eudragit®L30 D-55, Eudragit® L 100-55, Eudragit® L 100, Eudragit® L 12,5, Eudragit® S100, Eudragit® S12,5, Eudragit® FS 30D, etc., although not being limited thereto) or the acrylic acid copolymer Carbomer may be used. It is ionized in the form of COO −  in an aqueous solution and exists in the form of COO − Na + , COO −  K +  or COOH in a solid phase. 
     The pharmaceutical preparation composition according to the present disclosure may contain the anionic polymer containing carboxyl groups in an amount of 1-60 wt %, more specifically 3-20 wt %, based on the total weight of the composition. If the amount is less than 1 wt %, it is difficult to achieve a bitterness masking effect. And, if it exceeds 60 wt %, the oral disintegration rate, texture and convenience of medication worsen significantly because the total weight of the pharmaceutical preparation is increased and portability may worsen due to increased size. 
     In the present disclosure, as the ‘cationic polymer containing amino groups’, any natural cationic polymer or synthetic cationic polymer which is nontoxic and does not negatively affect the pharmacological activity of varenicline or a pharmaceutically acceptable salt thereof may be used without limitation. Specifically, a cationic polymer containing amino groups polymerized from acrylic acid, methacrylic acid or styrene as a monomer may be used. For example, aminoalkyl methacrylate copolymers, which are cationic methacrylic acid copolymers, include EudragitE100®, EudragitEPO® and EudragitE12.5®, styrene-based copolymers include KyronT-123®, Indion454® and acrylic acid copolymers include Purolite A830EMR®, etc. In addition, natural cationic polymers include lecithin, chitosan, gelatin, etc., although not being limited thereto. 
     The pharmaceutical preparation composition according to the present disclosure may contain the cationic polymer, specifically the cationic polymer containing amino groups, in an amount of 1-60 wt %, more specifically 2-20 wt %, based on the total weight of the composition. If the amount is less than 1 wt %, it is difficult to achieve a bitterness masking effect. And, if it exceeds 60 wt %, the oral disintegration rate, texture and convenience of medication worsen significantly because the total weight of the pharmaceutical preparation is increased and portability may worsen due to increased size. 
     In the pharmaceutical preparation according to the present disclosure, the weight ratio of the total weight of the anionic polymer containing carboxyl groups based on the total weight of the varenicline or a pharmaceutically acceptable salt thereof may be specifically 10:1 to 1:100, more specifically 10:1 to 1:10. If the weight ratio is less than 10:1, it is difficult to achieve a bitterness masking effect. And, if it exceeds 1:100, the oral disintegration rate, texture and convenience of medication worsen significantly because the total weight of the pharmaceutical preparation is increased and portability may worsen due to increased size. 
     In the pharmaceutical preparation according to the present disclosure, the weight ratio of the total weight of the cationic polymer based on the total weight of the varenicline or a pharmaceutically acceptable salt thereof may be specifically 10:1 to 1:100, more specifically 10:1 to 1:10. If the weight ratio is less than 10:1, it is difficult to achieve a bitterness masking effect. And, if it exceeds 1:100, the oral disintegration rate, texture and convenience of medication worsen significantly because the total weight of the pharmaceutical preparation is increased and portability may worsen due to increased size. 
     In the pharmaceutical preparation according to the present disclosure, the weight ratio of the total weight of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups based on the total weight of the varenicline or a pharmaceutically acceptable salt thereof may be specifically 10:1 to 1:100, more specifically 10:1 to 1:10. If the weight ratio is less than 10:1, it is difficult to achieve a bitterness masking effect. And, if it exceeds 1:100, the oral disintegration rate, texture and convenience of medication worsen significantly because the total weight of the pharmaceutical preparation is increased and portability may worsen due to increased size. 
     In the pharmaceutical preparation according to the present disclosure, the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups synergistically exert a superior bitterness masking effect. The bitterness masking effect is maximized when the weight ratio of the total weight of the cationic polymer containing amino groups based on the total weight of the anionic polymer containing carboxyl groups is 10:1 to 1:100, more specifically 5:1 to 1:4. If the weight ratio of the total weight of the cationic polymer containing amino groups based on the total weight of the anionic polymer containing carboxyl groups is less than 10:1, it is difficult to achieve a bitterness masking effect. And, if it exceeds 1:100, the oral disintegration rate, texture and convenience of medication worsen significantly because the total weight of the pharmaceutical preparation is increased and portability may worsen due to increased size. 
     In the pharmaceutical preparation according to the present disclosure, the weight ratio of the total weight of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups based on the total weight of the varenicline or a pharmaceutically acceptable salt thereof may be 10:1 to 1:100 (varenicline or pharmaceutically acceptable salt thereof: anionic polymer containing carboxyl groups and cationic polymer containing amino groups), more specifically 10:1 to 1:10. If the weight ratio is less than 10:1, it is difficult to achieve a bitterness masking effect. And, if it exceeds 1:100, the oral disintegration rate, texture and convenience of medication worsen significantly because the total weight of the pharmaceutical preparation is increased and portability may worsen due to increased size. 
     In the pharmaceutical preparation according to the present disclosure, the weight ratio of the total weight of the varenicline or a pharmaceutically acceptable salt thereof, the weight ratio of the anionic polymer containing carboxyl groups and the weight ratio of the cationic polymer containing amino groups may be 10:1:1 to 1:100:100 (varenicline or pharmaceutically acceptable salt thereof: anionic polymer containing carboxyl groups: cationic polymer containing amino groups), more specifically 10:1:1 to 1:10:10 (varenicline or pharmaceutically acceptable salt thereof: anionic polymer, specifically anionic polymer containing carboxyl groups: cationic polymer, specifically cationic polymer containing amino groups), more specifically 5:4:1 to 1:100:100, further more specifically 1:8:2 to 1:40:10, most specifically 1:8:2. If the weight ratio is less than 10:1:1, it is difficult to achieve a bitterness masking effect. And, if it exceeds 1:100:100, the oral disintegration rate, texture and convenience of medication worsen significantly because the total weight of the pharmaceutical preparation is increased and portability may worsen due to increased size. 
     The pharmaceutical preparation according to the present disclosure may be prepared as an orally administered formulation. For example, it may be prepared into various formulations, e.g., a tablet, a film, a suspension, a granule, a gel, a pill, a tincture, a decoction, an infusion, a spirit, a fluid extract, an elixir, an extract, a syrup, a powder, an aromatic water, a lemonade, etc. And, the tablet may be prepared into various forms, e.g., an orally disintegrating tablet, a mucoadhesive tablet, a dispersible tablet, a sublingual tablet, a buccal tablet, a chewable tablet, an effervescent tablet, a solution tablet, etc. In addition, those of ordinary skill can make various modifications to the tablet as desired. More specifically, it may be an intraoral dispersible formulation, e.g., an orally dissolving film, an orally disintegrating tablet, a suspension, a suspension tablet, a rapidly disintegrating tablet, an orally disintegrating granule, an orally disintegrating troche, a sublingual tablet, a powder and/or a chewable tablet, which is dissolved, dispersed or disintegrated in liquids or in the mouth. When considering the situation where the pharmaceutical preparation is administered, portability and various purposes, the pharmaceutical preparation according to the present disclosure may be prepared as a suspension formulation, an orally dissolving film formulation, a rapidly disintegrating tablet or an orally disintegrating granule. Specifically, 80% or more of the formulations may be dissolved, dispersed or disintegrated within 10 minutes or 5 minutes after oral administration. The term orally dissolving film may be used interchangeably with a film, a strip, an orally disintegrating film, etc. and refers to a formulation which is adhered in the oral cavity, e.g., on the tongue, on the oral mucosa, below the tongue, etc. The orally disintegrating film or rapidly disintegrating tablet according to the present disclosure is advantageous in that it can be administered without water. 
     When the orally administered pharmaceutical preparation according to the present disclosure is prepared as an orally dissolving film, a polymer has to be contained to form the film. Because the orally administered pharmaceutical preparation according to the present disclosure contains many anionic ingredients, compatibility with the polymer is important. Therefore, pullulan, hydroxypropyl cellulose (HPC), hydroxypropyl methylcellulose (HPMC), polyvinylpyrrolidone (PVP), starch, a polyethylene glycol-polyvinyl alcohol copolymer, copovidone, hydroxyethyl cellulose, hydroxypropyl starch, polyethylene oxide, poloxamer or a mixture thereof may be specifically used. The polymer may be contained in an amount of 20-50 wt % based on the weight of the dried film, although not being limited thereto. 
     The orally administered pharmaceutical preparation according to the present disclosure may further contain a pharmaceutically acceptable carrier that can be commonly added to a pharmaceutical preparation. The pharmaceutically acceptable carrier may contain an additive commonly used in the pharmaceutical field such as an excipient, a plasticizer, a disintegrant, a diluent, a solvent, a penetration enhancer, a preservative, a buffer, a gelator, a lubricant, a carrier, a stabilizer, a gel, a dye, a pigment, a surfactant, an inert filler, an adhesive, a texturizer, a softener, an emulsifier and a mixture thereof. 
     The orally administered pharmaceutical preparation according to the present disclosure may contain 40-99.7 wt % of the additive based on the total weight of the preparation. When the pharmaceutical preparation is an orally disintegrating film, it may contain 90-99.8 wt % of the additive based on the total weight of the preparation. When the pharmaceutical preparation is a rapidly disintegrating tablet, it may contain 90-99.8 wt % of the additive based on the total weight of the preparation. 
     A suitable binder or excipient includes, for example, cellulose, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxymethyl cellulose, polypropylpyrrolidone, polyvinylpyrrolidone, gelatin, polyethylene glycol, starch, natural or synthetic gum (e.g., alginate or gum arabic), mannitol, microcrystalline cellulose, anhydrous calcium hydrogen phosphate, sorbitol, L-HPC (low-substituted hydroxypropyl cellulose), pregelatinized starch, lactose or a mixture thereof, although not being limited thereto. Specifically, the binder or excipient may be contained in an amount of 0.01-90 wt % based on the total weight of the orally administered pharmaceutical preparation. When the pharmaceutical preparation is an orally disintegrating film, it may contain 1-90 wt % of the binder or excipient based on the total weight of the pharmaceutical preparation. When the pharmaceutical preparation is a rapidly disintegrating tablet, it may contain 1-99.8 wt % of the binder or excipient based on the total weight of the pharmaceutical preparation. 
     A suitable lubricant includes, for example, calcium stearate, glyceryl monostearate, glyceryl palmitostearate, magnesium stearate, polyethylene glycol, sodium benzoate, sodium lauryl sulfate, sodium stearyl fumarate, stearic acid, talc and zinc stearate, although not being limited thereto. Specifically, the lubricant may be contained in an amount of 0.1-3 wt % based on the total weight of the orally administered pharmaceutical preparation. When the pharmaceutical preparation is a rapidly disintegrating tablet, it may contain 0.1-5 wt % of the lubricant based on the total weight of the pharmaceutical preparation. 
     A suitable disintegrant includes, for example, sodium starch glycolate, sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, croscarmelose sodium, polyvinylpyrrolidone, methyl cellulose, microcrystalline cellulose, powdered cellulose, lower alkyl-substituted hydroxypropyl cellulose, polacrilin potassium, starch, pregelatinized starch, sodium alginate, etc., although not being limited thereto. Specifically, the disintegrant may be contained in an amount of 1-80 wt % based on the total weight of the orally administered pharmaceutical preparation. When the pharmaceutical preparation is an orally disintegrating film, it may contain 3-45 wt % of the disintegrant based on the total weight of the pharmaceutical preparation. When the pharmaceutical preparation is a rapidly disintegrating tablet, it may contain 0.1-90 wt % of the disintegrant based on the total weight of the pharmaceutical preparation. 
     If necessary, a sweetener, a flavor and/or a colorant may be further contained, but the sweetener, flavor and/or colorant may cause irritation during swallowing. The sweetener, flavor and/or colorant may be contained in an amount of 5 wt % or less, more specifically 3 wt % or less, most specifically 1 wt % or less, based on the total weight of the orally administered pharmaceutical preparation according to the present disclosure. 
     When the pharmaceutical preparation of the present disclosure is used to treat dependence on or addiction to nicotine or tobacco products or as a smoking cessation aid, it may further contain, in addition to the varenicline or the pharmaceutically acceptable salt thereof, another drug as an active ingredient as long as the purpose of the present disclosure is not negatively affected. For example, it may contain one or more selected from a group consisting of an α7-nicotinic acetylcholine receptor antagonist, an agent for treating withdrawal symptoms (e.g., bupropion, rimonabant, dihydroerysodine, dopamine, mecamylamine, cytisine, 3-methylaminoisocamphane, baclofen, clopazolin, butanone, etc.), a nicotine-specific antibody, an anti-protein antibody, a natural product (e.g., angelicae radix, zizyphus seed, red  ginseng , skullcap, etc.) or a combination thereof. Those of ordinary skill can select various drugs in addition to the above-described drugs, if necessary. 
     The pharmaceutical preparation according to the present disclosure may be used for any disease, disorder and/or symptom treated by administering the varenicline or the pharmaceutically acceptable salt thereof as an active ingredient without limitation. For example, it may be used for a disorder or disease including inflammatory bowel disease, ulcerative colitis, pyoderma gangrenosum, Crohn&#39;s disease, irritable bowel syndrome, spasmodic dystonia, chronic pain, acute pain, celiac sprue, pouchitis, vasoconstriction, anxiety, panic disorder, depression, bipolar disorder, autism, sleep disorder, jet lag syndrome, amyotrophic lateral sclerosis (ALS), cognitive impairment, hypertension, bulimia, anorexia, obesity, cardiac arrhythmia, gastric acid hypersecretion, ulcer, pheochromocytoma, progressive supranuclear palsy, drug dependence and addiction (dependence on or addiction to, e.g., nicotine, tobacco products, alcohol, benzodiazepine, barbiturate, opioid or cocaine), headache, apoplexy, traumatic brain injury (TBI), obsessive-compulsive disorder (OCD), psychosis, Huntington&#39;s chorea, tardive dyskinesia, hyperkinesia, alexia, schizophrenia, multi-infarct dementia, age-related cognitive decline, epilepsy (including absence epilepsy), Alzheimer&#39;s disease (AD), Parkinson&#39;s disease (PD), attention deficit hyperactivity disorder (ADHD), Tourette syndrome and other similar disorders or diseases known in the art (although not being limited thereto). Specifically, it may be used to treat dependence on or addiction to nicotine or tobacco products. 
     In the present disclosure, ‘treatment’ means any action of improving or beneficially altering a (acute or chronic) disease, a disorder or a symptom resulting therefrom by administering the pharmaceutical preparation. In a broad sense, the ‘treatment’ includes ‘prevention’, which means any action of preventing the occurrence of a disease or a symptom resulting therefrom or delaying the occurrence by administering the pharmaceutical preparation. The ‘treatment’ includes, for example, the interruption, alleviation, improvement, stopping, suppression, delaying, reversal, etc. of a (acute or chronic) disease, a disorder or a symptom resulting therefrom. 
     The dosage, frequency and continuance of administration will vary depending on such factors as the characteristics and seriousness of the condition to be treated, the age and general physical conditions of a subject (host) and the resistance of the subject (host) to the active ingredient. The pharmaceutical preparation may be provided as a once-daily administration form, a multiple-daily administration form or a once-weekly administration form. The prescription may last from about 2-3 days to several weeks or longer. 
     In an exemplary embodiment, the pharmaceutical preparation according to the present disclosure may contain 0.5-1 mg of the varenicline or the pharmaceutically acceptable salt thereof for a single-dose unit. More specifically, although the dosage of the varenicline or a pharmaceutically acceptable salt thereof contained in a single-dose unit of the pharmaceutical preparation may vary depending on the specific medicinal use, the unique taste of the varenicline or a pharmaceutically acceptable salt thereof is effectively masked when the anionic polymer containing carboxyl groups and the cationic polymer as the taste masking ingredients are added in combination to 0.5-1 mg of the varenicline or the pharmaceutically acceptable salt thereof for a single-dose unit. In a specific exemplary embodiment, because the varenicline or a pharmaceutically acceptable salt thereof corresponding to a daily dosage of the single-dose unit can be taken without discomfort, the daily dosage of the single-dose unit can be taken at once. Accordingly, a continuous medication regimen of taking the drug every day can be changed into a periodic medication regimen of taking the drug with predetermined intervals. Through this, the side effects that may occur in the continuous medication regimen can be resolved, although the present disclosure is not limited to such effect. 
     In an exemplary embodiment, the present disclosure may provide a single-dose unit of an orally administered pharmaceutical preparation, which contains: 0.5-1 mg of the varenicline or a pharmaceutically acceptable salt thereof, and 0.05-100 mg of the anionic polymer containing carboxyl groups and 0.05-100 mg of the cationic polymer. 
     In another aspect, the present disclosure provides a method for preparing a bitterness-masked orally administered pharmaceutical preparation, which contains varenicline or a pharmaceutically acceptable salt thereof as an active ingredient and contains both an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups. 
     The present disclosure provides a method for masking the bitterness of an orally administered pharmaceutical preparation containing varenicline or a pharmaceutically acceptable salt thereof as an active ingredient by adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups together. 
     When the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups are added together, the bitterness of the orally administered pharmaceutical preparation containing varenicline or a pharmaceutically acceptable salt thereof as an active ingredient can be masked. 
     In a specific exemplary embodiment, the orally administered pharmaceutical preparation may be prepared by adding the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups to the varenicline or a pharmaceutically acceptable salt thereof in liquid state and dissolving the same through stirring. Through this, the orally administered pharmaceutical preparation containing the varenicline or a pharmaceutically acceptable salt thereof as an active ingredient which can be administered without water may be prepared. 
     In another aspect, the present disclosure provides a method for administering an orally administered pharmaceutical preparation containing varenicline or a pharmaceutically acceptable salt thereof as an active ingredient and containing both an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups with bitterness masked by administering the orally administered pharmaceutical preparation to a patient in need thereof. 
     Advantageous Effects 
     According to the present disclosure, the unique bitter taste of varenicline is effectively masked and the irritation during swallowing is removed. Accordingly, the unpleasantness when orally administering a pharmaceutical preparation containing varenicline as an active ingredient is effectively masked and the pharmaceutical preparation can be administered orally for a long period of time. 
    
    
     DETAILED DESCRIPTION 
     Hereinafter, the present disclosure will be described in detail with reference to the following examples. However, it should be understood that the following examples are not intended to limit the scope of the present disclosure and various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. It will be apparent that these exemplary embodiments are provided so that the present disclosure will be complete and understood easily by those skilled in the art. 
     Example 1. Preparation of Film Formulation Containing Varenicline Tartrate as Active Ingredient 
     After adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups to varenicline tartrate dissolved in a solution, the mixture was stirred for at least 1 hour. 
     Then, after adding a plasticizer, a flavoring agent, a coloring agent, a sweetening agent, a surfactant and an excipient (diluent) to purified water and dissolving or dispersing by stirring, the mixture was homogenized using a homogenizer (Ultra-Turrax T-25, IKA). Then, after adding a polymer (pullulan) and then homogenizing using the same homogenizer, a gas was removed from the solution for preparing a film in vacuo and the solution was coated on a PET film to an appropriate thickness. Then, a film formulation containing varenicline tartrate was prepared by drying the same at 60-80° C. 
     Example 2. Preparation of Film Formulation Containing Varenicline Salicylate as Active Ingredient 
     After adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups to varenicline salicylate dissolved in a solution, the mixture was stirred for at least 1 hour. 
     Then, after adding a plasticizer, a flavoring agent, a coloring agent, a sweetening agent, a surfactant and an excipient (diluent) to purified water and dissolving or dispersing by stirring, the mixture was homogenized using a homogenizer (Ultra-Turrax T-25, IKA). Then, after adding a polymer (pullulan) and then homogenizing using the same homogenizer, a gas was removed from the solution for preparing a film in vacuo and the solution was coated on a PET film to an appropriate thickness. Then, a film formulation containing varenicline salicylate was prepared by drying the same at 60-80° C. 
     Example 3. Preparation of Rapidly Disintegrating Tablet Containing Varenicline Tartrate as Active Ingredient 
     After adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups to varenicline tartrate dissolved in a solution, the mixture was stirred for at least 1 hour. 
     Then, a solid was obtained by filtering and drying the solution. After adding a binder, a disintegrant, an excipient (diluent) and a lubricant to the obtained solid and then mixing the same, a tablet was prepared using a tablet-making machine. 
     Example 4. Preparation of Rapidly Disintegrating Tablet Containing Varenicline Salicylate as Active Ingredient 
     After adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups to varenicline salicylate dissolved in a solution, the mixture was stirred for at least 1 hour. 
     Then, a solid was obtained by filtering and drying the solution. After adding a binder, a disintegrant, an excipient (diluent) and a lubricant to the obtained solid and then mixing the same, a tablet was prepared using a tablet-making machine. 
     Example 5. Preparation of Granule Containing Varenicline Tartrate as Active Ingredient 
     After adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups to varenicline tartrate dissolved in a solution, the mixture was stirred for at least 1 hour. 
     Then, a solid was obtained by filtering and drying the solution. Separately from this, a solution containing a binder, a disintegrant and an excipient (diluent) was prepared and the obtained solid was added into a fluidized-bed granulator and then spray-dried to prepare a granule. 
     Example 6. Preparation of Granule Containing Varenicline Salicylate as Active Ingredient 
     After adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups to varenicline salicylate dissolved in a solution, the mixture was stirred for at least 1 hour. 
     Then, a solid was obtained by filtering and drying the solution. Separately from this, a solution containing a binder, a disintegrant and an excipient (diluent) was prepared and the obtained solid was added into a fluidized-bed granulator and then spray-dried to prepare a granule. 
     Example 7. Preparation of Suspension Containing Varenicline Tartrate as Active Ingredient 
     After adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups to varenicline tartrate dissolved in a solution, the mixture was stirred for at least 1 hour. Then, after adding a flavoring agent, a coloring agent, a sweetening agent, a surfactant and a viscosity increasing agent to purified water, a suspension was prepared by stirring the mixture. 
     Example 8. Preparation of Suspension Containing Varenicline Salicylate as Active Ingredient 
     After adding an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups to varenicline salicylate dissolved in a solution, the mixture was stirred for at least 1 hour. Then, after adding a flavoring agent, a coloring agent, a sweetening agent, a surfactant and a viscosity increasing agent to purified water, a suspension was prepared by stirring the mixture. 
     Test Example 1. Test of Bitterness Masking Effect of Film Formulation Containing Varenicline Tartrate as Active Ingredient when Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups are Used 
     A film formulation containing varenicline tartrate as an active ingredient was prepared in the same manner as in Example 1, using an anionic polymer containing carboxyl groups alone, a cationic polymer containing amino groups alone or a combination of an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 1. 
     The bitterness masking effect of the film formulation was tested as follows. The TM sensory test was performed for the formulations of the same weight. A test subject put the formulation sample containing varenicline tartrate of the same amount in the mouth, dissolved it for the same time period, spitted it out and then lightly rinsed the mouth with the same amount of water. Then, the time for which bitter and burning taste was maintained was recorded. The time between tests for each formulation sample was set to 3 hours or longer and the subject who felt the bitter and burning taste longer than 3 hours was excluded from the next test. 
     The result is shown in Table 1. 
     
       
         
           
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                   
                   
                 Compar- 
                   
                   
                   
                   
                   
                   
               
               
                   
                   
                 ative 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
            
               
                   
                   
                 Example 
                 Example (%) 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                   
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
            
           
           
               
               
            
               
                 Varenicline Tartrate 
                 0.24 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Taste 
                 (anionic polymer) Purolite C108DR 
                 — 
                 2.33 
                 — 
                 2.31 
                 2.31 
                 — 
                 — 
               
               
                 masking 
                 (anionic polymer) Eudragit L100 
                 — 
                 — 
                 2.33 
                 — 
                 — 
                 2.31 
                 2.31 
               
               
                 agent 
                 (cationic polymer) Purolite 
                 — 
                 — 
                 — 
                 0.93 
                 — 
                 0.93 
                 — 
               
               
                   
                 A830EMR 
                   
                   
                   
                   
                   
                   
                   
               
               
                   
                 (cationic polymer) Eudragit EPO 
                 — 
                 — 
                 — 
                 — 
                 0.930 
                 — 
                 0.93 
               
            
           
           
               
               
            
               
                 Pullulan 
                 13.0 
               
               
                 Plasticizer 
                 7.0 
               
               
                 Aspartame 
                 3.0 
               
               
                 Pigment 
                 10.0 
               
               
                 Diluent 
                 Q.S 
               
               
                 Flavor 
                 Q.S 
               
               
                 Water 
                 to 100% 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Taste masking value 
                 1 
                 2 
                 2 
                 4 
                 4 
                 3 
                 3 
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 1, the bitterness masking effect was remarkably superior when the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups were used together as compared to when the anionic polymer containing carboxyl groups was used alone. 
     Test Example 2. Test of Bitterness Masking Effect of Film Formulation Containing Varenicline Tartrate as Active Ingredient Depending on Weight Ratio of Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups 
     A film formulation containing varenicline tartrate as an active ingredient was prepared in the same manner as in Example 1, using a combination of an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 2 by varying their weight ratio. 
     The bitterness masking effect of the film formulation was tested in the same manner as described in Test Example 1. 
     The result is shown in Table 2. 
     
       
         
           
               
               
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                   
                 Com- 
                   
               
               
                   
                 par- 
                   
               
               
                   
                 ative 
                   
               
               
                   
                 Ex- 
                   
               
               
                   
                 ample 
                 Example % 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Ratio 
                 — 
                 10:1 
                 1:10 
                 1:100 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 (API:TM agent) 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ratio of TM agent 
                   
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
               
               
                 (Anionic polymer:  
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Cationic polymer) 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
            
               
                 Varenicline Tartrate 
                 0.25 
                 0.24 
                 0.23 
                 0.19 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Taste 
                 Purolite  
                 — 
                 0.002 
                 0.019 
                 0.019 
                 0.005 
                 0.019 
                 0.210 
                 1.941 
                 1.867 
                 0.467 
                 2.220 
                 1.751 
                 16.049 
                 15.426 
                 3.857 
                 18.359 
               
               
                 masking 
                 C108DR 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 agent 
                 Eudragit  
                 — 
                 0.021 
                 0.004 
                 0.005 
                 0.019 
                 0.001 
                 2.100 
                 0.387 
                 0.467 
                 1.867 
                 0.107 
                 17.513 
                 3.202 
                 3.857 
                 15.426 
                 0.918 
               
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Pullulan 
                 13.0 
               
               
                 Plasticizer 
                 7.0 
               
               
                 Aspartame 
                 3.0 
               
               
                 Pigment 
                 10.0 
               
               
                 Diluent 
                 Q.S 
               
               
                 Flavor 
                 Q.S 
               
               
                 Water 
                 to 100% 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Effect of taste  
                 1   
                 2 
                 3 
                 3 
                 3 
                 1 
                 3 
                 4 
                 4 
                 4 
                 2 
                 3 
                 4 
                 4 
                 4 
                 3 
               
            
           
           
               
               
            
               
                 masking 
                   
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 2, superior bitterness masking effect was achieved for the varenicline tartrate (API) when the weight ratio of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups used as the bitter taste masking agents was in the range from 5:1 to 1:4. 
     Test Example 3. Test of Bitterness Masking Effect of Rapidly Disintegrating Tablet Containing Varenicline Tartrate as Active Ingredient Depending on Weight Ratio of Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups 
     A rapidly disintegrating tablet containing varenicline tartrate as an active ingredient was prepared in the same manner as in Example 1, using a combination of an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 3 by varying their weight ratio. 
     The bitterness masking effect of the rapidly disintegrating tablet was tested in the same manner as described in Test Example 1. 
     The result is shown in Table 3. 
     
       
         
           
               
               
               
               
            
               
                   
               
               
                   
                   
                 Com- 
                   
               
               
                   
                   
                 par- 
                   
               
               
                   
                   
                 ative 
                   
               
               
                   
                   
                 Ex- 
                   
               
               
                   
                   
                 ample 
                 Example % 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                   
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7  
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Ratio 
                 — 
                 10:1 
                 1:10 
                 1:100 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 (API:TM agent) 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ratio of TM agent 
                   
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
               
               
                 (Anionic polymer: 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Cationic polymer) 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
            
               
                 Varenicline  
                 0.25 
                 0.24 
                 0.23 
                 0.19 
               
               
                 Tartrate 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Taste 
                 Purolite  
                 — 
                 0.002 
                 0.019 
                 0.019 
                 0.005 
                 0.019 
                 0.210 
                 1.941 
                 1.867 
                 0.467 
                 2.220 
                 1.751 
                 16.049 
                 15.426 
                 3.857 
                 18.359 
               
               
                 masking 
                 C108DR 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 agent 
                 Eudragit  
                 — 
                 0.021 
                 0.004 
                 0.005 
                 0.019 
                 0.001 
                 2.100 
                 0.387 
                 0.467 
                 1.867 
                 0.107 
                 17.513 
                 3.202 
                 3.857 
                 15.426 
                 0.918 
               
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Binder &amp;  
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Disintegration 
                   
               
               
                 agent &amp; Diluent 
                 60.0 
               
               
                 Aspartame 
                 7.0 
               
               
                 Flavor (If needed) 
                 Q.S 
               
               
                 Lubricant (If  
                 Q.S 
               
               
                 needed) 
                   
               
               
                 Water 
                 to 100% 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Effect of taste  
                 1   
                 2 
                 3 
                 3 
                 3 
                 1 
                 3 
                 4 
                 4 
                 4 
                 3 
                 3 
                 4 
                 4 
                 4 
                 3 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 3, superior bitterness masking effect was achieved for the varenicline tartrate (API) when the weight ratio of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups used as the bitter taste masking agents was in the range from 5:1 to 1:4. 
     Test Example 4. Test of Film Formulation Depending on Weight Ratio of Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups Based on Varenicline Tartrate 
     A film formulation containing varenicline tartrate as an active ingredient was prepared in the same manner as in Example 1, by varying the weight ratio of varenicline tartrate, an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 4. 
     The upper weight ratio limit and the lower weight ratio limit of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups, which are bitterness masking agents, were set to 1:100:100 and 10:1:1, respectively. 
     The bitterness masking effect of the prepared film formulation was tested in the same manner as described in Test Example 1. 
     Tensile strength was tested by the following method. 
     After coating the solution for forming a film on a support film and cutting to a predetermined size, the formed film was detached from the support film and tensile strength was measured using a universal testing machine (texture analyzer) under the following condition. 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 Universal testing machine 
                 LLOYD LS-1 
               
               
                   
                   
               
             
            
               
                   
                 Load cell (N) 
                 100N 
               
               
                   
                 Grips 
                 Pneumatic vice grips 
               
               
                   
                 Testing speed (mm/min) 
                 200 
               
               
                   
                 Distance between the grips (mm) 
                  2 
               
               
                   
                 Air pressure of the grip (MPa) 
                  0 
               
               
                   
                   
               
            
           
         
       
     
     The tensile strength was calculated from the measurement results according to the following equation. 
       Tensile strength=load value( N )/sample area(mm 2 ) 
     Flexibility was evaluated as follows. After coating the solution for forming a film on a support film and cutting to a predetermined size, the formed film was detached from the support film. After folding the formed film, the maximum angle at which the film was not broken was measured. 
     The result is shown in Table 4. 
     
       
         
           
               
               
               
               
             
               
                 TABLE 4 
               
               
                   
               
             
            
               
                   
                   
                 Comparative 
                   
               
               
                   
                   
                 Example 
                 Example (%) 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 Ratio 
                   
                 — 
                 10:1:1 
                 5:4:1 
                 1:100:100 
                 1:8:2 
                 1:40:10 
               
            
           
           
               
               
               
               
               
               
               
            
               
                 (API:Anionic polymer:  
                   
                   
                   
                   
                   
                   
               
               
                 Cationic polymer) 
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline Tartrate 
                 0.25 
                 0.25 
                 0.24 
                 0.23 
                 0.22 
                 0.17 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Taste  
                 Purolite  
                 — 
                 0.02 
                 0.19 
                 1.87 
                 8.36 
                 17.00 
               
               
                 masking 
                 C108DR 
                   
                   
                   
                   
                   
                   
               
               
                 agent 
                 Eudragit  
                 — 
                 0.02 
                 0.05 
                 0.47 
                 2.21 
                 17.00 
               
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Pullulan 
                 13.00 
               
               
                 Plasticizer 
                 7.00 
               
               
                 Aspartame 
                 3.00 
               
               
                 Pigment 
                 10.00 
               
               
                 Diluent 
                 Q.S 
               
               
                 Flavor 
                 Q.S 
               
               
                 Water 
                 to 100% 
               
               
                   
               
            
           
           
               
               
               
            
               
                 Evaluation  
                   
                 Example No. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 parameter 
                 Weigh 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 Effect of taste  
                 2 
                 2 
                 4 
                 6 
                 8 
                 8 
                 6 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Tensile strength 
                 1 
                 4 
                 4 
                 4 
                 4 
                 3 
                 2 
               
               
                 Flexibility 
                 1 
                 4 
                 4 
                 4 
                 4 
                 3 
                 2 
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Total score 
                 10 
                 12 
                 14 
                 16 
                 14 
                 10 
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 * Tensile strength 
               
            
           
           
               
               
            
               
                 1—poor 
                 Tensile strength value: NMT 5 N/mm 2   
               
               
                 2—not good 
                 Tensile strength value: NMT 10 N/mm 2   
               
               
                 3—not bad 
                 Tensile strength value: NLT 10 N/mm 2   
               
               
                 4—excellent 
                 Tensile strength value: NLT 15 N/mm 2   
               
            
           
           
               
            
               
                 * Flexibility 
               
            
           
           
               
               
            
               
                 1—poor 
                 Maximised folding angle without breaking NMT 60° 
               
               
                 2—not good 
                 Maximised folding angle without breaking NMT 90° 
               
               
                 3—not bad 
                 Maximised folding angle without breaking: NLT 90° 
               
               
                 4—excellent 
                 Maximsed folding angle without breaking: NLT 150° 
               
            
           
           
               
            
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 4, the most superior effect was achieved in terms of the bitterness masking effect, tensile strength and flexibility considered together when the weight ratio was 1:8:2. 
     Test Example 5. Test of Rapidly Disintegrating Tablet Depending on Weight Ratio of Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups Based on Varenicline Tartrate 
     A rapidly disintegrating tablet containing varenicline tartrate as an active ingredient was prepared in the same manner as in Example 3, by varying the weight ratio of varenicline tartrate, an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 5. 
     The upper weight ratio limit and the lower weight ratio limit of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups, which are bitterness masking agents, were set to 1:100:100 and 10:1:1, respectively. 
     The bitterness masking effect of the prepared rapidly disintegrating tablet was tested in the same manner as described in Test Example 1. 
     Disintegration time was tested according to the Korean Pharmacopoeia General Test Method. 
     The result is shown in Table 5. 
     
       
         
           
               
               
               
               
             
               
                 TABLE 5 
               
               
                   
               
             
            
               
                   
                   
                 Comparative 
                   
               
               
                   
                   
                 Example 
                 Example (%) 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ratio 
                 — 
                 10:1:1 
                 5:4:1 
                 1:8:2 
                 1:40:10 
                 1:100:100 
               
               
                 (API:Anionic polymer: 
                   
                   
                   
                   
                   
                   
               
               
                 Cationic polymer) 
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline Tartrate 
                 0.25 
                 0.25 
                 0.24 
                 0.23 
                 0.22 
                 0.17 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Taste  
                 Purolite  
                 — 
                 0.02 
                 0.19 
                 1.87 
                 8.36 
                 17.00 
               
               
                 masking 
                 C108DR 
                   
                   
                   
                   
                   
                   
               
               
                 agent 
                 Eudragit  
                 — 
                 0.02 
                 0.05 
                 0.47 
                 2.21 
                 17.00 
               
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Binder &amp; Disintegration  
                 60.00 
               
               
                 agent &amp; Diluent 
                   
               
               
                 Aspartame 
                 7.00 
               
               
                 Flavor (If needed) 
                 Q.S 
               
               
                 Lubricant (If needed) 
                 Q.S 
               
               
                 Water 
                 to 100% 
               
               
                   
               
            
           
           
               
               
               
            
               
                 Evaluation  
                   
                 Example No. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 parameter 
                 Weigh 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 Effect of taste  
                 2 
                 2 
                 4 
                 6 
                 8 
                 8 
                 6 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Distintegration 
                 1 
                 4 
                 4 
                 4 
                 4 
                 3 
                 2 
               
               
                 Total score 
                   
                 6 
                 8 
                 10 
                 12 
                 11 
                 8 
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 * Disintegration time 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of ODT in sinker: NLT 2 min 
               
               
                 2—not good 
                 Retention time of ODT in sinker: NLT 1 min 
               
               
                 3—not bad 
                 Retention time of ODT in sinker: NMT 1 min 
               
               
                 4—excellent 
                 Retention time of ODT in sinker: NMT 30 sec 
               
            
           
           
               
            
               
                 *The test is performed using disintegration tester 
               
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 5, the most superior effect was achieved in terms of the bitterness masking effect and disintegration time considered together when the weight ratio was 1:8:2. 
     Test Example 6. Test of Bitterness Masking Effect of Film Formulation Containing Varenicline Salicylate as Active Ingredient Depending on Weight Ratio of Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups 
     A film formulation containing varenicline salicylate as an active ingredient was prepared in the same manner as in Example 2, using a combination of an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 6 by varying their weight ratio. 
     The bitterness masking effect of the film formulation was tested in the same manner as described in Test Example 1. 
     The result is shown in Table 6. 
     
       
         
           
               
               
               
             
               
                 TABLE 6 
               
             
            
               
                   
               
               
                   
                 Com- 
                   
               
               
                   
                 para- 
                   
               
               
                   
                 tive  
                   
               
               
                   
                 Ex- 
                   
               
               
                   
                 ample 
                 Example % 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Ratio 
                 — 
                 10:1 
                 1:10 
                 1:100 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 (API:TM agent) 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ratio of TM agent 
                   
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
               
               
                 (Anionic polymer:  
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Cationic polymer) 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
            
               
                 Varenicline  
                 0.26 
                 0.26 
                 0.25 
                 0.21 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Salicylate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Taste 
                 Purolite  
                 — 
                 0.002 
                 0.019 
                 0.019 
                 0.005 
                 0.019 
                 0.210 
                 1.941 
                 1.867 
                 0.467 
                 2.220 
                 1.751 
                 16.049 
                 15.426 
                 3.857 
                 18.359 
               
               
                 masking 
                 C108DR 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 agent 
                 Eudragit  
                 — 
                 0.021 
                 0.004 
                 0.005 
                 0.019 
                 0.001 
                 2.100 
                 0.387 
                 0.467 
                 1.867 
                 0.107 
                 17.513 
                 3.202 
                 3.857 
                 15.426 
                 0.918 
               
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Pullulan 
                 13.0 
               
               
                 Plasticizer 
                 7.0 
               
               
                 Aspartame 
                 3.0 
               
               
                 Pigment 
                 10.0 
               
               
                 Diluent 
                 Q.S 
               
               
                 Flavor 
                 Q.S 
               
               
                 Water 
                 to 100% 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Effect of taste  
                 1 
                 2 
                 3 
                 3 
                 3 
                 2 
                 3 
                 4 
                 4 
                 4 
                 3 
                 3 
                 4 
                 4 
                 4 
                 3 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effecs: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 6, superior bitterness masking effect was achieved for the varenicline salicylate (API) when the weight ratio of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups used as the bitter taste masking agents was in the range from 5:1 to 1:4. 
     Test Example 7. Test of Bitterness Masking Effect of Rapidly Disintegrating Tablet Containing Varenicline Salicylate as Active Ingredient Depending on Weight Ratio of Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups 
     A rapidly disintegrating tablet containing varenicline salicylate as an active ingredient was prepared in the same manner as in Example 2, using a combination of an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 7 by varying their weight ratio. 
     The bitterness masking effect of the film formulation was tested in the same manner as described in Test Example 1. 
     The result is shown in Table 7. 
     
       
         
           
               
               
               
               
             
               
                 TABLE 7 
               
             
            
               
                   
               
               
                   
                   
                 Com- 
                   
               
               
                   
                   
                 para- 
                   
               
               
                   
                   
                 tive 
                   
               
               
                   
                   
                 Ex- 
                   
               
               
                   
                   
                 ample 
                 Example % 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                   
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7  
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Ratio 
                 — 
                 10:1 
                 1:10 
                 1:100 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 (API:TM agent) 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ratio of TM agent 
                   
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
                 1:10 
                 5:1 
                 4:1 
                 1:4 
                 20:1 
               
               
                 (Anionic polymer: 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Cationic polymer) 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
            
               
                 Varenicline  
                 0.26 
                 0.26 
                 0.25 
                 0.21 
               
               
                 Salicylate 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Taste 
                 Purolite  
                 — 
                 0.002 
                 0.019 
                 0.019 
                 0.005 
                 0.019 
                 0.210 
                 1.941 
                 1.867 
                 0.467 
                 2.220 
                 1.751 
                 16.049 
                 15.426 
                 3.857 
                 18.359 
               
               
                 masking 
                 C108DR 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 agent 
                 Eudragit  
                 — 
                 0.021 
                 0.004 
                 0.005 
                 0.019 
                 0.001 
                 2.100 
                 0.387 
                 0.467 
                 1.867 
                 0.107 
                 17.513 
                 3.202 
                 3.857 
                 15.426 
                 0.918 
               
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Binder &amp;  
                 60.0 
               
               
                 Disintegration 
                   
               
               
                 agent &amp; Diluent 
                   
               
               
                 Aspartame 
                 7.0 
               
               
                 Flavor (If needed) 
                 Q.S 
               
               
                 Lubricant  
                 Q.S 
               
               
                 (If needed) 
                   
               
               
                 Water 
                 to 100% 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Effect of taste  
                 1 
                 2 
                 3 
                 3 
                 3 
                 2 
                 3 
                 4 
                 4 
                 4 
                 3 
                 3 
                 4 
                 4 
                 4 
                 3 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 (NLT: no less than, 
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 7, superior bitterness masking effect was achieved for the varenicline salicylate (API) when the weight ratio of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups used as the bitter taste masking agents was in the range from 5:1 to 1:4. 
     Test Example 8. Test of Film Formulation Depending on Weight Ratio of Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups Based on Varenicline Salicylate 
     A film formulation containing varenicline salicylate as an active ingredient was prepared in the same manner as in Example 2, by varying the weight ratio of varenicline salicylate, an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 8. 
     The upper weight ratio limit and the lower weight ratio limit of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups, which are bitterness masking agents, were set to 1:100:100 and 10:1:1, respectively. 
     The bitterness masking effect of the prepared film formulation was tested in the same manner as described in Test Example 1. 
     Tensile strength was tested by the following method. 
     After coating the solution for forming a film on a support film and cutting to a predetermined size, the formed film was detached from the support film and tensile strength was measured using a universal testing machine (texture analyzer) under the following condition. 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 Universal testing machine 
                 LLOYD LS-1 
               
               
                   
                   
               
             
            
               
                   
                 Load cell (N) 
                 100N 
               
               
                   
                 Grips 
                 Pneumatic vice grips 
               
               
                   
                 Testing speed (mm/min) 
                 200 
               
               
                   
                 Distance between the grips (mm) 
                  2 
               
               
                   
                 Air pressure of the grip (MPa) 
                  0 
               
               
                   
                   
               
            
           
         
       
     
     The tensile strength was calculated from the measurement results according to the following equation. 
       Tensile strength=load value( N )/sample area(mm 2 ) 
     Flexibility was evaluated as follows. After coating the solution for forming a film on a support film and cutting to a predetermined size, the formed film was detached from the support film. After folding the formed film, the maximum angle at which the film was not broken was measured. 
     The result is shown in Table 8. 
     
       
         
           
               
               
               
               
             
               
                 TABLE 8 
               
               
                   
               
             
            
               
                   
                   
                 Comparative 
                   
               
               
                   
                   
                 Example 
                 Example (%) 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ratio 
                 — 
                 10:1:1 
                 5:4:1 
                 1:8:2 
                 1:40:10 
                 1:100:100 
               
               
                 (API:Anionic polymer: 
                   
                   
                   
                   
                   
                   
               
               
                 Cationic polymer) 
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline Salicylate 
                 0.26 
                 0.27 
                 0.26 
                 0.25 
                 0.24 
                 0.19 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Taste 
                 Purolite  
                 — 
                 0.02 
                 0.19 
                 1.87 
                 8.36 
                 17.00 
               
               
                 masking 
                 C108DR 
                   
                   
                   
                   
                   
                   
               
               
                 agent 
                 Eudragit 
                 — 
                 0.02 
                 0.05 
                 0.47 
                 2.21 
                 17.00 
               
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Pullulan 
                 13.00 
               
               
                 Plasticizer 
                 7.00 
               
               
                 Aspartame 
                 3.00 
               
               
                 Pigment 
                 10.00 
               
               
                 Diluent 
                 Q.S 
               
               
                 Flavor 
                 Q.S 
               
               
                 Water 
                 to 100% 
               
               
                   
               
            
           
           
               
               
               
            
               
                 Evaluation 
                   
                 Example No. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 parameter 
                 Weigh 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 Effect of taste  
                 2 
                 2 
                 4 
                 6 
                 8 
                 8 
                 8 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Tensile strength 
                 1 
                 4 
                 4 
                 4 
                 4 
                 3 
                 2 
               
               
                 Flexibility 
                 1 
                 4 
                 4 
                 4 
                 4 
                 3 
                 2 
               
               
                 Total score 
                   
                 10 
                 12 
                 14 
                 16 
                 14 
                 12 
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 * Tensile strength 
               
            
           
           
               
               
            
               
                 1—poor 
                 Tensile strength value : NMT 5 N/mm 2   
               
               
                 2—not good 
                 Tensile strength value : NMT 10 N/mm 2   
               
               
                 3—not bad 
                 Tensile strength value : NLT 10 N/mm 2   
               
               
                 4—excellent 
                 Tensile strength value : NLT 15 N/mm 2   
               
            
           
           
               
            
               
                 * Flexibility 
               
            
           
           
               
               
            
               
                 1—poor 
                 Maximised folding angle without breaking NMT 60° 
               
               
                 2—not good 
                 Maximised folding angle without breaking NMT 90° 
               
               
                 3—not bad 
                 Maximised folding angle without breaking: NLT 90° 
               
               
                 4—excellent 
                 Maximsed folding angle without breaking: NLT 150° 
               
            
           
           
               
            
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 8, the most superior effect was achieved in terms of the bitterness masking effect, tensile strength and flexibility considered together when the weight ratio was 1:8:2. 
     Test Example 9. Test of Rapidly Disintegrating Tablet Depending on Weight Ratio of Anionic Polymer Containing Carboxyl Groups and Cationic Polymer Containing Amino Groups Based on Varenicline Salicylate 
     A rapidly disintegrating tablet containing varenicline salicylate as an active ingredient was prepared in the same manner as in Example 4, by varying the weight ratio of varenicline salicylate, an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as described in Table 9. 
     The upper weight ratio limit and the lower weight ratio limit of the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups, which are bitterness masking agents, were set to 1:100:100 and 10:1:1, respectively. 
     The bitterness masking effect of the prepared rapidly disintegrating tablet was tested in the same manner as described in Test Example 1. 
     Disintegration time was tested according to the Korean Pharmacopoeia General Test Method. 
     The result is shown in Table 9. 
     
       
         
           
               
               
               
               
             
               
                 TABLE 9 
               
               
                   
               
             
            
               
                   
                   
                 Comparative  
                   
               
               
                   
                   
                 Example 
                 Example (%) 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ratio 
                 — 
                 10:1:1 
                 5:4:1 
                 1:100:100 
                 1:8:2 
                 1:40:10 
               
               
                 (API:Anionic polymer 
                   
                   
                   
                   
                   
                   
               
               
                 Cationic polymer) 
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline Salicylate 
                 0.27 
                 0.27 
                 0.26 
                 0.25 
                 0.24 
                 0.19 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Taste 
                 Purolite  
                 — 
                 0.02 
                 0.19 
                 1.87 
                 8.36 
                 17.00 
               
               
                 masking 
                 C108DR 
                   
                   
                   
                   
                   
                   
               
               
                 agent 
                 Eudragit 
                 — 
                 0.02 
                 0.05 
                 0.47 
                 2.21 
                 17.00 
               
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Binder &amp; Disintegration 
                 60.00 
               
               
                 agent &amp; Diluent 
                   
               
               
                 Aspartame 
                 7.00 
               
               
                 Flavor (If needed) 
                 Q.S 
               
               
                 Lubricant (If needed) 
                 Q.S 
               
               
                 Water 
                 to 100% 
               
               
                   
               
            
           
           
               
               
               
            
               
                 Evaluation 
                   
                 Example No. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 parameter 
                 Weigh 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 Effect of taste  
                 2 
                 2 
                 4 
                 6 
                 8 
                 8 
                 8 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Distintegration 
                 1 
                 4 
                 4 
                 4 
                 4 
                 3 
                 2 
               
               
                 Total score 
                   
                 6 
                 8 
                 10 
                 12 
                 11 
                 10 
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 * Disintegration time 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of ODT in sinker: NLT 2 min 
               
               
                 2—not good 
                 Retention time of ODT in sinker: NLT 1 min 
               
               
                 3—not bad 
                 Retention time of ODT in sinker: NMT 1 min 
               
               
                 4—excellent 
                 Retention time of ODT in sinker: NMT 30 sec 
               
            
           
           
               
            
               
                 *The test is performed using disintegration tester 
               
               
                 (NLT: no less than, 
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As seen from Table 9, the most superior effect was achieved in terms of the bitterness masking effect and disintegration time considered together when the weight ratio was 1:8:2. 
     Test Example 10. Test of Difference in Bitterness Masking Effect of Film Formulation Depending on Change in Varenicline Salts 
     A film formulation was prepared in the same manner as in Example 1 and Example 2, by varying the varenicline salt as described in Table 10 and using an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as bitterness masking agents. 
     The bitterness masking effect of the prepared film formulation was tested in the same manner as described in Test Example 1. 
     The result is shown in Table 10. 
     
       
         
           
               
               
               
             
               
                 TABLE 10 
               
             
            
               
                   
               
               
                   
                 Comparative Example (%) 
                 Example (%) 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
                 14 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
                 14 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Varenicline  
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Tartrate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Salicylate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Sulfate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Fumarate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Oxalate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Hydrochloride 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Hydiobromide 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Citrate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Malate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
               
               
                 Succinate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
               
               
                 Phosphate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
               
               
                 Tosylate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
               
               
                 Free Base 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
               
               
                 Mesylate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
            
               
                 TM 
                 Purolite  
                 — 
                 1.87 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 agent 
                 C108DR 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
            
               
                   
                 Eudragit  
                 — 
                 0.47 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                   
                 EPO 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
            
               
                 Pullulan 
                 13 
               
               
                 Plasticizer 
                 7 
               
               
                 Aspartame 
                 3 
               
               
                 Pigment 
                 10 
               
               
                 Diluent 
                 Q.S 
               
               
                 Flavor 
                 Q.S 
               
               
                 Water 
                 up to 100% 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Effect of taste  
                 1 
                 1 
                 1 
                 1  
                 1  
                 1  
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1  
                 1  
                 4  
                 4  
                 4  
                 4  
                 4  
                 3  
                 3  
                 4  
                 4  
                 4  
                 3  
                 4  
                 3 
                 4 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As a result, superior bitterness masking effect was achieved for all of varenicline tartrate, varenicline salicylate, varenicline sulfate, varenicline fumarate, varenicline oxalate, varenicline hydrochloride, varenicline hydrobromide, varenicline citrate, varenicline maleate, varenicline succinate, varenicline phosphate, varenicline tosylate, varenicline free base and varenicline mesylate, when the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups were used as bitterness masking agents. 
     Test Example 11. Test of Difference in Bitterness Masking Effect of Rapidly Disintegrating Tablet Depending on Change in Varenicline Salts 
     A rapidly disintegrating tablet was prepared in the same manner as in Example 3 and Example 4, by varying the varenicline salt as described in Table 11 and using an anionic polymer containing carboxyl groups and a cationic polymer containing amino groups as bitterness masking agents. 
     The bitterness masking effect of the prepared rapidly disintegrating tablet was tested in the same manner as described in Test Example 1. 
     The result is shown in Table 11. 
     
       
         
           
               
               
               
             
               
                 TABLE 11 
               
             
            
               
                   
               
               
                   
                 Comparative Example (%) 
                 Example (%) 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
                 14 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
                 14 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Varenicline  
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Tartrate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Salicylate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Sulfate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Fumarate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Oxalate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Hydrochloride 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Hydrobromide 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Citrate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Malate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
               
               
                 Succinate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
               
               
                 Phosphate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
               
               
                 Tosylate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
               
               
                 Free Base 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 Varenicline  
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 0.23 
               
               
                 Mesylate 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
            
               
                 TM 
                 Purolite  
                 — 
                 1.87 
               
               
                 agent 
                 C108 
                   
                   
               
               
                   
                 DR 
                   
                   
               
               
                   
                 Eudra-  
                 — 
                 0.47 
               
               
                   
                 git 
                   
                   
               
               
                   
                 EPO 
                   
                   
               
            
           
           
               
               
            
               
                 Binder &amp;  
                 60 
               
               
                 Disintegration 
                   
               
               
                 agent &amp;  
                   
               
               
                 Diluent 
                   
               
               
                 Aspartame 
                 7 
               
               
                 Flavor  
                 Q.S 
               
               
                 (If needed) 
                   
               
               
                 Lubricant  
                 Q.S 
               
               
                 (If needed) 
                   
               
               
                 Water 
                 up to 100% 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Effect of taste  
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 4 
                 4 
                 4 
                 4 
                 4 
                 3 
                 3 
                 4 
                 4 
                 4 
                 3 
                 4 
                 3 
                 4 
               
               
                 masking 
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
           
               
            
               
                 * Taste masking value 
               
            
           
           
               
               
            
               
                 1—poor 
                 Retention time of Bitter, burning effects: NLT 60 min. 
               
               
                 2—not good 
                 Retention time of Bitter, burning effects: NLT 20 min. 
               
               
                 3—not bad 
                 Retention time of Bitter, burning effects: NMT 20 min. 
               
               
                 4—excellent 
                 Retention time of Bitter, burning effects: NMT 5 min. 
               
            
           
           
               
            
               
                 (NLT: no less than,  
               
               
                 NMT: no more than) 
               
            
           
         
       
     
     As a result, superior bitterness masking effect was achieved for all of varenicline tartrate, varenicline salicylate, varenicline sulfate, varenicline fumarate, varenicline oxalate, varenicline hydrochloride, varenicline hydrobromide, varenicline citrate, varenicline maleate, varenicline succinate, varenicline phosphate, varenicline tosylate, varenicline free base and varenicline mesylate, when the anionic polymer containing carboxyl groups and the cationic polymer containing amino groups were used as bitterness masking agents.