Abstract:
A press coated, pulsatile drug delivery system suitable for oral administration having an immediate-release compartment, which contains a compressed blend of an active agent and one or more polymers, substantially enveloped by an extended-release compartment, which contains a compressed blend of the active agent and hydrophilic and hydrophobic polymers, can provide a substantially first order delivery of the active agent, interrupted by a timed, pulsed delivery of an increased amount of the active agent; and when the extended-release compartment is substantially enveloped by an optional instant-release compartment, can provide a dose sufficient to exceed the liver&#39;s metabolic capacity and to maintain therapeutic levels, preferably throughout a 24-hour period.

Description:
FIELD OF THE INVENTION 
     The present invention pertains to a drug delivery system suitable for oral administration that facilitates a pulsatile release of the active agent. A key aspect of the present invention is the discovery that a tablet with an immediate-release compartment, which contains a compressed blend of an active agent and one or more polymers, substantially enveloped by an extended-release compartment, which contains a compressed blend of the active agent and hydrophilic and hydrophobic polymers, can provide a substantially first order delivery of the active agent, interrupted by a timed, pulsed delivery of a preferably increased amount of the active agent. With respect to drugs subject to “first pass” clearance, sustained drug delivery can be achieved through the present invention via an optional instant-release compartment, which provides a dose sufficient to exceed the liver&#39;s metabolic capacity and to maintain therapeutic levels, preferably throughout a 24-hour period. 
     BACKGROUND OF THE INVENTION 
     Drug efficacy generally depends upon the ability of the drug to reach its target in sufficient quantity to maintain therapeutic levels for the desired time period. The pulsatile release of an active agent is desirable when treating diseases that require drug delivery in a manner to maintain therapeutic levels notwithstanding circadian rhythms. Diseases that benefit from pulsatile drug delivery include angina, for example, which occurs with repeatable regularity at the end of the night and in the early morning hours while the patient is still asleep, and rheumatic diseases such as rheumatoid arthritis, the symptoms of which manifest during the night and into the beginning of the next day. 
     With traditional extended-release dosage formulations, which exhibit first order release rates, the efficacy of the active agent diminishes at the end of the night and the beginning of the next day. Therefore, a bolus or burst delivery of the active agent during this waning period can improve drug efficacy. 
     In addition, orally administered drugs must overcome several obstacles to reach their desired targets. Before orally administered drugs enter the general circulation of the human body, they are absorbed into the capillaries and veins of the upper gastrointestinal tract and are transported by the portal vein to the liver. The pH and enzymatic activities found in gastrointestinal fluids may inactivate the drug or cause the drug to dissolve poorly. Following their absorption in the intestine, certain orally administered drugs can be subject to a “first pass” clearance by the liver and excreted into bile or converted into pharmacologically inactive metabolites. Decreased bioavailability of orally administered drugs can be a consequence of this first pass effect. 
     Orally administered drugs subject to the first pass effect generally exhibit non-linear pharmacokinetics. Until the liver&#39;s metabolic capacity has been exceeded, the amount of such drugs in the bloodstream is significantly lower than the amount administered. This metabolic elimination of the given dose results in reduced bioavailability. However, once the administered dose exceeds the liver&#39;s metabolic capacity, a significant increase in the drug concentration in the bloodstream may be obtained. The first pass phenomenon presents particular difficulties in the maintenance of therapeutic levels of an orally administered drug over an extended period such as 12 or 24 hours. 
     Drug delivery systems that have evolved with respect to orally administered drugs subject to the first pass effect include formulations capable of immediate drug release that are suitable for administration from 3-4 times daily, and formulations capable of immediate and sustained drug release that are suitable for once-daily administration. The second type of formulation is preferred because patient compliance with prescribed drug regimens involving once-daily administration is substantially higher than those involving multiple administrations. A sustained release formulation, however, may subject the patient to toxic drug levels over part of the dosing period and sub-therapeutic drug levels over other portions of the dosing period, if the drug release does not occur at appropriate time intervals. The maintenance of therapeutic levels of an orally administered drug over an extended period thus depends upon a drug delivery system capable of providing an appropriate release pattern. 
     A valuable contribution to the art therefore would be the development of a drug delivery system in a single tablet formulation suitable for oral administration that facilitates a substantially first order delivery of the active agent, interrupted by a timed, pulsed delivery of a preferably increased amount of the active agent, and where the active agent is subject to “first pass” clearance, can provide sustained drug delivery, preferably over a 24-hour period, by a dose sufficient to exceed the liver&#39;s metabolic capacity and to maintain therapeutic levels. 
     SUMMARY OF THE INVENTION 
     Accordingly, an objective of the present invention is a single orally administrable tablet that can provide a substantially first order delivery of the active agent, interrupted by a timed, pulsed delivery of an increased amount of the active agent. A second objective of the present invention is a single orally administrable tablet that can overcome the “first pass” effect by providing an instant-release dosage sufficient to exceed the liver&#39;s metabolic capacity, and then continue to maintain therapeutic drug. levels, preferably-over a 24-hour period. A further objective of the present invention is a method for preparing of a single orally administrable tablet that can provide a substantially first order delivery of the active agent, interrupted by a timed, pulsed delivery of a preferably increased amount of the active agent. 
     In a preferred embodiment of the invention, these and other objectives can be accomplished through a drug delivery system suitable for oral administration with an immediate-release compartment, which contains a compressed blend of an active agent and one or more polymers, substantially enveloped by an extended-release compartment, which contains a compressed blend of the active agent and hydrophilic and hydrophobic polymers, and substantially enveloped by an optional instant-release compartment, which provides a dose sufficient to exceed the liver&#39;s metabolic capacity and to maintain therapeutic levels, preferably throughout a 24-hour period. 
     In a preferred embodiment of the present invention, the active agent in the extended-release compartment can diffuse out first, resulting in a first order release rate. As the active agent and soluble polymers in the extended-release compartment disintegrate, water will penetrate through the extended-release compartment and cause the immediate-release compartment to expand, creating a bursting effect that further disrupts any remaining integrity of the extended-release compartment. Where an optional inert core (i.e., a core containing one or more polymers without active agent) is present, its swelling in response to the water influx described above can also contribute to a bursting effect. The respective time periods for the dissolution of the active agent, and the bursting effect, can be regulated by varying the composition and relative amounts of the polymers in the compartments. 
     The extended-release compartment preferably comprises a combination of hydrophilic and hydrophobic polymers. In this embodiment, once administered, the hydrophilic polymer dissolves away to weaken the structure of the extended-release compartment, and the hydrophobic polymer retards the water penetration and helps to maintain the shape of the drug delivery system. The immediate-release compartment preferably comprises a compressed blend of active agent and one or more polymers with disintegration characteristics, which upon exposure to the aqueous medium, would burst to further break apart the already weakened extended-release compartment and provide preferably complete drug release. In another embodiment, the immediate-release drug compartment and the combination of hydrophilic and hydrophobic polymers in the extended-release drug compartment can be modified so the second peak does not result in a burst. Instead, the second peak can be tailored to be completed in a desired time interval, for example, 30 minutes to 12 hours after release of active agent from the extended-release compartment. 
     In another embodiment, the extended-release compartment can be inert (i.e., containing a combination of hydrophilic and hydrophobic polymers without active agent), which may be preferable where delayed drug release is necessary or convenient. For example, if orally administered before bedtime, this drug delivery system could deliver its active agent while the patient is asleep to facilitate optimal therapeutic drug levels just prior to awakening. 
     In a preferred embodiment, the active agent is a drug, which may be a therapeutic drug or a prophylactic drug. In another preferred embodiment, the drug can be diltiazem, trapidil, urapidil, benziodarone, dipyridamole, isosorbide mononitrate, or lidoflazine. In yet another, the drug can be a non-steroidal antiinflammatory drug (NSAID) or a steroidal antiinflammatory drugs, which includes diclofenac sodium, ibuprofen, ketoprofen, diflunisal, piroxicam, motrin, and naproxen. 
     In still another preferred embodiment, the drug can be acetaminophen, aldosterone, alprenolol, amitryptyline, aspirin, beclomethasone, diproprionate, bromocriptine, butorphanol tartrate, chlormethiazole, chlorpheniramine, chlorpromazine HCl, cimetidine, codeine, cortisone, cyclobenzamine HCl, desmethylimipramine, dextropropoxyphene, dihydroergotamine, diltiazem HCl, dobutamine HCl, domperidone, dopamine HCl, doxepin HCl, epinephrine, ergoloid mesylates, ergotamine tartrate estradiol, ethinylestradiol, flunisolide, fluorouracil, flurazepam HCl, 5-fluoro-21-deoxyuridine, furosemide, glipizide, glyburide, glyceryl trinitrate, guanethidine sulfate, hydralazine HCl, imipramine HCl, indoramin, isoethorine HCl, isoethrine mesylate, isoprenaline, isoproterenol sulfate, isosorbide dinitrate, levallorphan tartrate, levodopa, lidocaine HCl, lignocaine, lorcainide, meperidine HCl, 6-mercaptopurine, metaproterenol sulfate, methoxamine HCl, methylphenidate, methylpreonisolone, methyltestosterone mesylate, metoclopramide, metoprolol tartrate, morphine sulfate, nalbuphine HCl, naloxone HCl, neostigmine, nifedipine, nitrendipine, nitroglycerin, norepinephrine bitartrate, norethindrone, nortriptylene HCl, oxprenolol, oxyphenbutazone, penicillamine, pentazocine HCl, pentazocine lactate, pentobarbital, petnidine, phenacetin, phentolamine HCl, phentolamine mesylate, phenylephrine HCl, phenylephrine bitartrate, phenytoin, pindolal, prazosin, prednisone, progesterone, propoxyphene HCl, propoxyphene napsylate, propranolol HCl, quinidine, reserpine, ritodrine HCl, salicylamide, salbutamol, secobarbital, testosterone, terbutaline, timolol maleate, tolbutamide, or verapamil HCl. 
     In another preferred embodiment, the active agent can be isosorbide-5-mononitrate. 
     In a preferred embodiment, the active agent of the drug delivery can exhibit the following in vitro dissolution profile when measured in a type 2 dissolution apparatus (paddle) according to U.S. Pharmacopeia XXII at 37° C. in deionized water at 75 rotations per minute: 
     (a) from about 0% to about 90% of said active agent is released between 1 hour and 16 hours of measurement in said apparatus; and 
     (b) from about 0% to about 100% of said active agent is released between 1.5 hours and 28 hours after measurement in said apparatus. 
     In another preferred embodiment, the active agent of the drug delivery system can exhibit the following in vitro dissolution profile when measured under the same conditions described above: 
     (a) from about 10% to about 75% of said active agent is released between 1 hour and 5 hours of measurement in said apparatus; and 
     (b) no less than about 90% of said active agent is released after 6 hours of measurement in said apparatus. 
     In yet another preferred embodiment, the active agent of the drug delivery system exhibits the following in vitro dissolution profile when measured under the same conditions described above: 
     (a) from about 0% to about 50% of said active agent is released after 1 hour of measurement in said apparatus; 
     (b) from about 0% to about 90% of said active agent is released between 1 hour and 16 hours after measurement in said apparatus; and 
     (c) from about 0% to about 100% of said active agent is released between 1.5 hours and 28 hours after measurement in said apparatus. 
     In still another preferred embodiment, the active agent of the drug delivery system exhibits the following in vitro dissolution profile when measured under the same conditions described above: 
     (a) from about 0% to about 35% of said active agent is released after 1 hour of measurement in said apparatus; 
     (b) from about 10% to about 90% of said active agent is released between 1 hour and 5 hours after measurement in said apparatus; and 
     (c) no less than 90% of said active agent is released after 6 hours of measurement in said apparatus. 
     In a preferred embodiment, the active agent exhibiting these dissolution profiles can be isosorbide-5-mononitrate. 
     In a preferred embodiment, the polymer of the drug delivery system can be alginic acid, carboxymethylcellulose calcium, carboxymethylcellulose sodium, colloidal silicon dioxide, croscarmellose sodium, crospovidone, guar gum, magnesium aluminum silicate, magnesium stearate, methylcellulose, microcrystalline cellulose, polacrilin potassium, powdered cellulose, pregelatinized starch, sodium alginate, sodium starch glycolate, starch, ethylcellulose, gelatin, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, polymethacrylates, povidone, shellac, or zein, of which colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, microcrystalline cellulose, and hydroxypropyl methylcellulose are further preferred. 
     In a preferred embodiment of the invention, the hydrophilic polymer can be carboxymethylcellulose, guar gum, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, methylcellulose, or povidone, of which hydroxypropyl methylcellulose is further preferred. 
     In another embodiment, the hydrophobic polymer of the drug delivery system can be carbomer, carnauba wax, ethylcellulose, glyceryl palmitostearate, hydrogenated castor oil, hydrogenated vegetable oil type 1, microcrystalline wax, polacrilin potassium, polymethacrylates, or stearic acid, of which hydrogenated vegetable oil type 1 is further preferred. 
     The present invention also accomplishes these and other objectives through a method for preparing a press coated, pulsatile drug delivery system suitable for oral administration including the steps of combining an effective amount of an active agent, or a pharmaceutically acceptable salt thereof, and a polymer to form an immediate-release compartment; combining an effective amount of an active agent, or a pharmaceutically acceptable salt thereof, and a combination of hydrophilic and hydrophobic polymers to form an extended-release compartment; and press coating the extended-release compartment to substantially envelop the immediate-release compartment. 
     A preferred embodiment further includes the steps of combining an effective amount of an active agent, or a pharmaceutically acceptable salt thereof, and a polymer to form an instant-release compartment, and press coating the instant-release compartment to substantially envelop the extended-release compartment. 
     In another preferred embodiment, the combining steps can be done by blending, wet granulation, fluid-bed granulation, or dry granulation according to methods recognized the art. 
     Other objects, features and advantages of the present invention will become apparent from the following detailed description. The detailed description and the specific examples, however, indicate only preferred embodiments of the invention. Various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
    
    
     DESCRIPTION OF DRAWINGS 
     FIG. 1 is a schematic of a press coated, pulsatile drug delivery system of the present invention suitable for oral administration with an immediate-release compartment, which contains a compressed blend of an active agent and one or more polymers, substantially enveloped by an extended-release compartment, which contains a compressed blend of the active agent and hydrophilic and hydrophobic polymers. 
     FIG. 2 is a schematic of a press coated, pulsatile drug delivery system of the present invention suitable for oral administration with an immediate-release compartment, which contains a compressed blend of an active agent and one or more polymers, substantially enveloped by an extended-release compartment, which contains a compressed blend of the active agent and hydrophilic and hydrophobic polymers, and substantially enveloped by an instant-release compartment. 
     FIG. 3 is a graph showing the in vitro dissolution profile (% dissolved versus time) of isosorbide mononitrate extended release tablets, according to an embodiment of the present invention, in deionized water using a type 2 dissolution apparatus (paddle method) at 37±0.5° C. at 75 rotations per minute (rpm). See U.S. Pharmacopeia XXII &lt;711&gt; Dissolution. The graph reflects the following data: 
     
       
         
               
               
               
             
               
               
               
             
           
               
                   
               
               
                 Time 
                 Mean Percent 
                 Standard 
               
               
                 (minutes) 
                 Dissolved 
                 deviation (n = 12) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 0 
                 0 
                 0 
               
               
                 30 
                 11.3 
                 0.4 
               
               
                 60 
                 17.1 
                 0.6 
               
               
                 120 
                 25.7 
                 1.2 
               
               
                 180 
                 32.1 
                 1.6 
               
               
                 240 
                 55.8 
                 21.6 
               
               
                 300 
                 90.9 
                 11.0 
               
               
                 330 
                 95.6 
                 4.8 
               
               
                 360 
                 97.5 
                 4.1 
               
               
                 420 
                 98.8 
                 4.2 
               
               
                 480 
                 98.9 
                 4.5 
               
               
                 540 
                 99.0 
                 4.6 
               
               
                 600 
                 98.3 
                 4.8 
               
               
                   
               
             
          
         
       
     
     FIG. 4 is a graph showing the in vitro dissolution profile (% dissolved versus time) of isosorbide mononitrate extended release tablets, according to an embodiment of the present invention, in deionized water using USP paddle method at 75 rpm. The graph reflects the following data: 
     
       
         
               
               
               
             
               
               
               
             
           
               
                   
               
               
                 Time 
                 Percent 
                 Standard 
               
               
                 (minutes) 
                 Dissolved 
                 deviation 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 0 
                 0 
                 0 
               
               
                 30 
                 20.2 
                 0.8 
               
               
                 60 
                 23.3 
                 0.8 
               
               
                 120 
                 27.8 
                 0.8 
               
               
                 180 
                 31.4 
                 0.9 
               
               
                 240 
                 35.2 
                 1.5 
               
               
                 300 
                 74.4 
                 25.8 
               
               
                 330 
                 91.4 
                 4.8 
               
               
                 360 
                 94.2 
                 2.4 
               
               
                 420 
                 95.6 
                 1.6 
               
               
                 480 
                 96.1 
                 1.6 
               
               
                 540 
                 96.2 
                 1.4 
               
               
                   
               
             
          
         
       
     
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     In accordance with the present invention, the term “active agent” includes one, or more drugs, their pharmaceutically acceptable salts, pro-drug forms, metabolites, and derivatives. 
     Active agents include therapeutic or prophylactic compounds as described in the Physicians&#39;Desk Reference, most preferably including (but not limited to) those prescribed for the prevention and/or treatment of angina and hypertension: diltiazem, trapidil, urapidil, benziodarone, dipyridamole, isosorbide mononitrate, and lidoflazine; and those prescribed for the prevention and/or treatment of rheumatic diseases such as rheumatoid arthritis: non-steroidal antiinflammatory drugs (NSAIDs) and steroidal antiinflammatory drugs such as diclofenac sodium, ibuprofen, ketoprofen, diflunisal, piroxicam, motrin, and naproxen, and combinations thereof. 
     The active agent of the present invention also preferably includes drugs that are subject to the first pass effect. Various examples of such drugs include (but are not limited to) acetaminophen, aldosterone, alprenolol, amitryptyline, aspirin, beclomethasone, diproprionate, bromocriptine, butorphanol tartrate, chlormethiazole, chlorpheniramine, chlorpromazine HCl, cimetidine, codeine, cortisone, cyclobenzamine HCl, desmethylimipramine, dextropropoxyphene, dihydroergotamine, diltiazem HCl, dobutamine HCl, domperidone, dopamine HCl, doxepin HCl, epinephrine, ergoloid mesylates, ergotamine tartrate estradiol, ethinylestradiol, flunisolide, fluorouracil, flurazepam HCl, 5-fluoro-21-deoxyuridine, furosemide, glipizide, glyburide, glyceryl trinitrate, guanethidine sulfate, hydralazine HCl, imipramine HCl, indoramin, isoethorine HCl, isoethrine mesylate, isoprenaline, isoproterenol sulfate, isosorbide dinitrate, levallorphan tartrate, levodopa, lidocaine HCl, lignocaine, lorcainide, meperidine HCl, 6-mercaptopurine, metaproterenol sulfate, methoxamine HCl, methylphenidate, methylpreonisolone, methyltestosterone mesylate, metoclopramide, metoprolol tartrate, morphine sulfate, nalbuphine HCl, naloxone HCl, neostigmine, nifedipine, nitrendipine, nitroglycerin, norepinephrine bitartrate, norethindrone, nortriptylene HCl, oxprenolol, oxyphenbutazone, penicillamine, pentazocine HCl, pentazocine lactate, pentobarbital, petnidine, phenacetin, phentolamine HCl, phentolamine mesylate, phenylephrine HCl, phenylephrine bitartrate, phenytoin, pindolal, prazosin, prednisone, progesterone, propoxyphene HCl, propoxyphene napsylate, propranolol HCl, quinidine, reserpine, ritodrine HCl, salicylamide, salbutamol, secobarbital, testosterone, terbutaline, timolol maleate, tolbutamide, and verapamil HCl. 
     In a preferred embodiment of the present invention, the active agent may include the drug, isosorbide-5-mononitrate, an organic nitrate, which is a vasodilator with effects on both arteries and veins. The empirical formula is C 6 H 9 NO 6  and the molecular weight is 191.14. The chemical name for isosorbide mononitrate is 1,4:3,6-dianhydro-D-glucitrol 5-nitrate. 
     Isosorbide mononitrate is the major active metabolite of isosorbide dinitrate and most of the clinical activity of the dinitrate can be attributable to the mononitrate. A principal pharmacological action of isosorbide mononitrate is relaxation of vascular smooth muscle and consequent dilatation of peripheral arteries and veins, especially the latter. Dilatation of the veins is known to promote peripheral pooling of blood and decrease venous return to the heart, thereby reducing left ventricular and-diastolic pressure and pulmonary capillary wedge pressure (preload). Arteriolar relaxation reduces systemic vascular resistance, systolic arterial pressure, and mean arterial pressure (afterload). Dilation of the coronary arteries also occurs. The relative importance of preload reduction, afterload reduction, and coronary dilatation remains undefined. The mechanism by which isosorbide mononitrate relieves angina pecteria is not fully understood. 
     Isosorbide mononitrate is rapidly and completely absorbed from the gastrointestinal tract. In humans, isosorbide mononitrate is not subject to first pass metabolism in the liver. The overall elimination half-life of isosorbide mononitrate is about 6 hours. The rate of clearance is the same in healthy young adults, and in patients with various degrees of renal, hepatic, or cardiac dysfunction. 
     In accordance with the present invention, the term “polymer” includes single or multiple polymeric substances, which can swell, gel, degrade or erode on contact with an aqueous environment (e.g., water), such as one or more of alginic acid, carboxymethylcellulose calcium, carboxymethylcellulose sodium, colloidal silicon dioxide, croscarmellose sodium, crospovidone, guar gum, magnesium aluminum silicate, methylcellulose, microcrystalline cellulose, polacrilin potassium, powdered cellulose, pregelatinized starch, sodium alginate, sodium starch glycolate, starch, ethylcellulose, gelatin, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, polymethacrylates, povidone, pregelatinized starch, shellac, and zein, and combinations thereof. 
     The “hydrophilic polymers” of the present invention include one or more of carboxymethylcellulose, guar gum, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, methylcellulose, and povidone. The “hydrophobic polymers” of the present invention include one or more of carbomer, carnauba wax, ethylcellulose, glyceryl palmitostearate, hydrogenated castor oil, hydrogenated vegetable oil type 1, microcrystalline wax, polacrilin potassium, polymethacrylates, and stearic acid. 
     Without further elaboration, it is believed that one skilled in the art, using the preceding description, can utilize the present invention to the fullest extent. The following examples are illustrative only, and not limiting of the remainder of the disclosure in any way whatsoever. 
     EXAMPLES 
     Example 1 
     The method below was employed to obtain a press coated, pulsatile drug delivery system, the composition of which is set forth in the tables immediately following: 
     Immediate-Release Compartment. Isosorbide mononitrate was first mixed with silicon dioxide in a Patterson-Kelley V-blender for 10 minutes, then microcrystalline cellulose and croscarmellulose sodium were added and blended for 10 more minutes. Finally, magnesium stearate was added to the blender and mix for another 10 minutes. The powder blend was then compressed using a Manesty Dry-cota with 0.2031″ in diameter, round, flat-face punch and die set. The hardness of the tablets were maintained at 4±2 kp. 
     Immediate-Release Compartment Plus Extended-Release Compartment Isosorbide mononitrate was first mixed with silicon dioxide in a Patterson-Kelley V-blender for 10 minutes, then hydroxypropyl methylcellulose 2208 and microcrystalline cellulose were added and blended for 10 more minutes. Finally, hydrogenated vegetable oil and magnesium stearate were added to the blender and mix for another 10 minutes. The core tablets were press-coated using the Manesty Dry-cota with 0.3600″ in diameter, round, shallow concave punch and die set. The hardness of the tablets were maintained at 12±4 kp. 
     Example 2 
     Immediate-Release Compartment Plus Extended-Release Compartment Plus Instant-Release Compartment The method of manufacture for the extended-release tablets is the same as described in Example 1. The application of the instant-release compartment was done by charging the extended-release tablets into a perforated pan coater or a fluidized particle coater and coated with a solution consist of isosorbide-5-mononitrate 80% w/ lactose and hydroxypropyl methylcellulose type 2910. The instant release coating may also be applied using the press-coating process described in Example 1 above with a blend consisting of isosorbide-5-mononitrate 80% w/ lactose and hydroxypropyl methylcellulose type 2910. 
     In addition, the formulation of respective release compartments can occur by appropriate granulation methods. In wet granulation, solutions of the binding agent (polymer) are added with stirring to the mixed powders. The powder mass is wetted with the binding solution until the mass has the consistency of damp snow or brown sugar. The wet granulated material is forced through a sieving device. Moist material from the milling step is dried by placing it in a temperature controlled container. After drying, the granulated material is reduced in particle size by passing through a sieving device. Lubricant is added, and the final blend is then compressed. 
     In fluid-bed granulation, particles of inert material and/or active agent are suspended in a vertical column with a rising air stream. While the particles are suspended, the common granulating materials in solution are sprayed into the column. There is a gradual particle buildup under a controlled set of conditions resulting in tablet granulation. Following drying and the addition of lubricant, the granulated material is ready for compression. 
     In dry-granulation, the active agent, diluent, and lubricant are blended and compressed into large tablets. The compressed large tablets are comminuted through the desirable mesh screen by sieving equipment. Some more lubricant is added to the granulated material and blended gently. The material is then compressed into tablets. 
     
       
         
               
               
             
               
               
               
             
               
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
             
             
               
                   
                   
               
               
                   
                 Quantity/Tablet 
               
             
          
           
               
                   
                 Example #1 
                 Example #2 
               
               
                   
                 RT-010 
                 RT-011 
               
               
                   
                 (press-coated 
                 (press coated 
               
               
                   
                 w/o instant- 
                 w/instant- 
               
               
                   
                 release 
                 release 
               
               
                   
                 coating) 
                 coating) 
               
               
                   
                   
               
             
          
           
               
                 Immediate-Release (IR) Compartment 
                   
                   
                   
                   
               
               
                 Isosorbide-5-mononitrate 80% w/lactose 
                 50.0 
                 mg 
                 50.0 
                 mg 
               
               
                 Croscarmellose sodium 
                 1.6 
                 mg 
                 1.6 
                 mg 
               
               
                 Microcrystalline cellulose 
                 26.8 
                 mg 
                 26.8 
                 mg 
               
               
                 Colloidal silicon dioxide 
                 0.8 
                 mg 
                 0.8 
                 mg 
               
               
                 Magnesium stearate 
                 0.8 
                 mg 
                 0.8 
                 mg 
               
               
                 Total: 
                 80.0 
                 mg 
                 80.0 
                 mg 
               
               
                 IR Compartment Plus Extended- 
               
               
                 Release (ER) Compartment 
               
               
                 IR Compartment 
                 80.0 
                 mg 
                 80.0 
                 mg 
               
               
                 Isosorbide-5-mononitrate 80% w/lactose 
                 37.5 
                 mg 
                 18.8 
                 mg 
               
               
                 Hydroxypropyl methylcellulose type 2208 
                 61.6 
                 mg 
                 61.6 
                 mg 
               
               
                 Microcrystalline cellulose 
                 70.3 
                 mg 
                 89.0 
                 mg 
               
               
                 Hydrogenated vegetable oil type 1 
                 46.2 
                 mg 
                 46.2 
                 mg 
               
               
                 Colloidal silicon dioxide 
                 2.2 
                 mg 
                 2.2 
                 mg 
               
               
                 Magnesium stearate 
                 2.2 
                 mg 
                 2.2 
                 mg 
               
               
                 Total: 
                 300.0 
                 mg 
                 300.00 
                 mg 
               
               
                 IR Compartment Plus ER 
               
               
                 Compartment Plus 
               
               
                 Instant-Release Compartment 
               
               
                 IR Compartment Plus ER Compartment 
                   
                   
                 300.0 
                 mg 
               
               
                 Isosorbide-5-mononitrate 80% w/lactose 
                   
                   
                 18.7 
                 mg 
               
               
                 Hydroxypropyl methylcellulose type 2910 
                   
                   
                 1.9 
                 mg 
               
               
                 Total: 
                   
                   
                 320.6 
                 mg 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 2 
               
             
             
               
                   
               
               
                 EXCIPIENT RANGE 
               
             
          
           
               
                   
                 Quantity/ 
                   
                   
               
               
                   
                 tablet 
               
               
                   
                 Example 
               
               
                   
                 #1 
               
               
                   
                 RT-010 
               
               
                   
                 (press 
               
               
                   
                 coated w/o 
               
               
                   
                 instant- 
               
               
                   
                 release 
               
               
                   
                 coating) 
                 Percent 
                 Range 
               
               
                   
                   
               
             
          
           
               
                 Immediate-Release Compartment 
                   
                   
                   
                   
               
               
                 Isosorbide-5-mononitrate 80% w/ 
                 50.0 
                 mg 
                 62.5% 
               
               
                 lactose 
               
               
                 Croscarmellose sodium 
                 1.6 
                 mg 
                 2.0% 
                 0.5-10.0% 
               
               
                 Microcrystalline cellulose 
                 26.8 
                 mg 
                 33.5% 
                 18.0-36.0% 
               
               
                 Colloidal silicon dioxide 
                 0.8 
                 mg 
                 1.0% 
                 0.5-2.0% 
               
               
                 Magnesium stearate 
                 0.8 
                 mg 
                 1.0% 
                 0.5-2.0% 
               
               
                 Total: 
                 80.0 
                 mg 
               
               
                 Extended-Release Compartment 
               
               
                 Isosorbide-5-mononitrate 80% w/ 
                 37.5 
                 mg 
                 17.0% 
               
               
                 lactose 
               
               
                 Hydroxypropyl methylcellulose 
                 61.6 
                 mg 
                 28.0% 
                 15.0-40.0% 
               
               
                 type 2208 
               
               
                 Microcrystalline cellulose 
                 70.3 
                 mg 
                 32.0% 
                 8.0-57.0% 
               
               
                 Hydrogenated vegetable oil type 1 
                 46.2 
                 mg 
                 21.0% 
                 10.0-30.0% 
               
               
                 Colloidal silicon dioxide 
                 2.2 
                 mg 
                 1.0% 
                 0.5-2.0% 
               
               
                 Magnesium stearate 
                 2.2 
                 mg 
                 1.0% 
                 0.5-2.0% 
               
               
                 Total: 
                 220.0 
                 mg 
               
               
                   
               
             
          
         
       
     
     The invention has been disclosed broadly and illustrated in reference to representative embodiments described above. Those skilled in the art will recognize that various modifications can be made to the present invention without departing from the spirit and scope thereof.