Use of specific core material and layers to obtain pharmaceutical formulations stable to discolouration of acid labile compounds

Abstract: The use of core material in the form of small beads or tablets containing as the active ingredient an acid labile compound of the general formula I and on said core material one or more inert reacting subcoating layers comprising tablet excipients which are soluble or rapidly disintegrating in water, or polymeric, water soluble, filmforming compounds, optionally containing pH-buffering, alkaline compounds between the alkaline reacting core and an outer layer, which is an enteric coating layer, in order to obtain an oral preparation stable to discolouration.

Description: The present invention is related to new pharmaceutical preparations containing acid labile substances for oral use, which pharmaceutical preparations are stable to discolouration, and to a method for the manufacture of such preparations. Acid labile substances present a problem to the formulator when formulating a pharmaceutical dosage form for oral use. In order to prevent the substances from contact with the acid reacting gastric juice after oral intake, the conventional way to solve this problem is to coat the dosage form with an enteric coating. The coating is a group of substances/polymers with the common feature of being practically insoluble in acid media, while they are soluble in neutral to alkaline media. For substances that are labile in acid media, but have better stability in neutral to alkaline media, it is often advantageous to add alkaline reacting inactive constituents in order to increase the stability of the active compound during manufacture and storage. A group of compounds exerting these stability properties are substituted benzimidazoles with the general formula I wherein A is an optionally substituted heterocyclic group and R¹, R², R³, and R⁴, are the same or different as defined below and R⁵ is H or a lower alkyl, or the compound 2-[(2-dimethylaminobenzyl)sulfinyl]-benzimidazole. The compounds with the general formula I are virtually biologically inactive as such, but degrade/transform to active inhibitors of certain enzyme systems in acid media. As examples of compounds with the mentioned properties the compounds described in the patents US-A-4045 563, EP-B1-0 005 129 and BE-898 880 and the patent applications EP-A-173664, EP-A1-0 080 602, EP-0127 763, EP-0 134 400, EP-0 130 729, EP-0 150 586, DE-3415971 GB-2 082 580 and SE-A-8504048-3 may be mentioned. The last application describes 2-(2-disubstituted-aminobenzyl)sulfinyl benzimidazoles, e.g. 2- (2-dimethylaminobenzyl)sulfinyl benzimidazole, also called, NC-1300 and presented by Prof. S. Okabe at the Symposium on Drug Activity held on Oct 17th 1985 in Nagoya, Japan, and which interacts with the H⁺K⁺-ATPase after acid degradation within the parietal cells. (See for instance B. Wallmark, A. Brändström and H. Larsson "Evidence for acid-induced transformation of omeprazole into active inhibitor of H⁺K⁺-ATPase within the parietal cell", Biochemica et Biophysica Acta 778 , 549-558, 1984). Other compounds with similar properties are further mentioned in the patent US-4 182 766 and the patent applications GB-2 141 429, EP-0 146 370 and GB-2 082 580. A common feature of these compounds are that they are transformed into the biologically active compounds via rapid degradation/transformation in acid media. The stability profile of some compounds with the general formula I above is exemplified in the Table 1 below, where the half-life of the degradation/transformation reaction in solution at pH 2 and 7 are given. Substituted sulfoxides, such as, for instance, the substituted benzimidazoles described in EP-B1-0005129 are potent inhibitors of gastric acid secretion. The substituted benzimidazoles are susceptible to degradation/transformation in acid reacting and neutral media. It is an inherent property of these compounds to be activated to the active moiety in the acid environment within the parietal cells. The activated compound interacts with the enzyme in the parietal cells, which mediates the production of hydrochloric acid in the gastric mucosa. All compounds of the class of substituted benzimidazoles, containing a sulfoxide grouping, which interferes with the H⁺K⁺-ATPase in the parietal cells hitherto known are all also degraded in acid media. A pharmaceutical dosage form of acid labile substances, which prevents the substances from contact with acidic gastric juice, must be enteric coated. Ordinary enteric coatings, however, are made of acidic compounds. If covered with such a conventional enteric coating, the acid labile substance rapidly decomposes by direct or indirect contact with it, with the result that the preparations become badly discoloured and lose in content of the active compound with the passage of time. In order to enhance the storage stability, the cores which contain the acid labile substance must also contain alkaline reacting constituents. When such an alkaline core is enteric coated with an amount of a conventional enteric coating polymer such as, for example, cellulose acetate phthalate, that permits the dissolution of the coating and the active drug contained in the cores in the proximal part of the small intestine, it also will allow some diffusion of water or gastric juice through the enteric coating into the cores, during the time the dosage form resides in the stomach before it is emptied into the small intestine. The diffused water of gastric juice will dissolve parts of the core in the close proximity of the enteric coating layer and there form an alkaline solution inside the coated dosage form. The alkaline solution will interfere with the enteric coating and eventually dissolve it. In DE-A1-3 046 559 a way to coat a dosage form is described. First the dosage form is coated with a water insoluble layer containing microcrystalline cellulose and then with a second enteric coating with the aim to achieve a dosage form which releases the active drug in the colon. This method of preparation will not give the desired release of the compounds with the general formula I above in the small intestine. US-A-2 540 979 describes an enteric coated oral dosage form, where the enteric coating is combined with a second and/or first coating of a water insoluble "wax" layer. This method of preparation is not applicable on cores containing a compound with the general formula I since direct contact between substances such as cellulose acetate phthalate (CAP) and a compound of formula I causes degradation and discolouration of the compounds of the formula I. DE-B2-23 36 218 describes a method to produce a dialysis membrane consisting of a mixture of one or more conventional enteric coating polymers and one or more insoluble cellulose derivates. Such a membrane will not give a proper protection of the acid labile compounds of the formula I in gastric juice. DE-A1-1 204 363 describes a three-layer coating procedure. The first layer is soluble in gastric but is insoluble in intestinal juice. The second is water soluble regardless of pH and the third layer is an enteric coating. This preparation as well as the preparation described in DE-A1-1 617 615 result in a dosage form which is not dissolved in gastric juice and which only dissolves slowly in intestinal juice. Such preparations cannot be used for the compounds of the formula I, where a rapid release of the drug in the small intestine is needed. DE-A1 12 04 363 describes coating with three layers to achieve release of a drug in the ileum, an aim which is outside the scope of the present invention. GB-A-1 485 676 describes a way to obtain a preparation which effervesces in the small intestine. This is obtained by the enteric coating of a core containing the active drug and an effervescing system such as a combination of carbonate and/or bicarbonate salt and a pharmaceutically acceptable acid. This formulation cannot be adopted for a pharmaceutical dosage form containing a compound of formula I as the presence of an acid in contact with a compound of formula I in the cores would give as a result that the compound of formula I was degraded. WO 85/03436 describes a pharmaceutical preparation wherein cores containing active drugs mixed with, for instance, buffering components such as sodium dihydrogenphosphate with the aim of maintaining a constant pH and a constant rate of diffusion, are coated with a first coating which controls the diffusion. This formulation cannot be adopted for acid labile compounds where a rapid release in the small intestine is wanted. Direct application of an enteric coating onto the cores would also adversely influence the storage stability of such dosage forms containing acid labile compounds. EP-A-124 495 and EP-A-173 664 describe enteric coated granules without subcoating or a powder that are filled into hard gelatine capsules or a solution that is filled into a soft capsule. The object of the present invention is to provide an oral, pharmaceutical preparation stable to discolouration comprising (i) an alkaline reacting core material containing as the active ingredient an acid labile compound of the general formula I above wherein A, R¹, R², R³, R⁴, and R⁵ and the acid labile compound are as defined below, together with an alkaline reacting compound, or an alkaline salt of the active ingredient optionally together with an alkaline reacting compound, and (ii) an outer layer, which is an enteric coating. This object is achieved in the use of a specific subcoating in the oral pharmaceutical preparation. The present invention therefore provides the use of a subcoating which is comprised of one or more inert reacting subcoating layers comprising tablet excipients which are soluble or rapidly disintegrating in water or polymeric, water-soluble, film-forming compounds, optionally containing pH-buffering alkaline compounds, in order to obtain stability to discolouration in an oral pharmaceutical formulation comprising an alkaline reacting core material containing as the active ingredient (i) a compound of the formula I wherein A is an optionally substituted heterocyclic group, R¹, R², R³ and R⁴ are the same or different and are hydrogen, lower alkyl, lower alkoxy, CF₃, alkyl or halogen and R⁵ is H or a lower alkyl group wherein "lower" denotes 1-6 carbon atoms, except the compound omeprazole, together with an alkaline reacting compound, or 2-[(2-dimethylaminobenzyl)sulfinyl]-benzimidazole together with an alkaline reacting compound or (ii) an alkaline salt of a compound of formula I optionally together with an alkaline reacting compound, or an alkaline salt of 2-[(2-dimethylaminobenzyl)sulfinyl]-benzimidazole optionally together with an alkaline reacting compound; and an enteric coating, between which and the alkaline reacting core the subcoating is placed, which core material is in the form of small beads or tablets. The object of the present invention is thus an enteric coated dosage form of acid labile compounds with the general formula I defined above except the compound omeprazole, 5-methoxy-2-[[(4-methoxy-3,5 dimethyl-2-pyridinyl) methyl] sulfinyl]- 1H -benzimidazole. Another compound, which may be enteric coated according to the invention is 2-[(2-dimethyl-aminobenzyl)sulfinyl]-benzimidazole. The new preparations are resistant to dissolution in acid media, dissolve rapidly in neutral to alkaline media and have a good stability during long-term storage. The new dosage form is characterized in the following way. Cores containing the acid labile compound mixed with alkaline compounds or an alkaline salt of the acid labile compound optionally mixed with an alkaline compound are coated with two or more layers, whereby the first layer/layers is/are soluble in water or rapidly disintegrating in water and consist(s) of non-acidic, otherwise inert pharmaceutically acceptable substances. This/these first layer/layers separates/separate the alkaline core material from the outer layer, which is an enteric coating. The final, enteric coated dosage form is treated in a suitable way to reduce the water content to a very low level in order to obtain a good stability with virtually no discolouration of the dosage form during long-term storage. As examples of compounds especially suitable for the pharmaceutical dosage form according to the invention the compounds listed in Table 1 can be mentioned. The half-life of degradation of the compounds 1-6 in Table 1 in water solution at pH-values less than four is in most cases shorter than ten minutes. Also at neutral pH-values the degradation reaction proceeds rapidly, e.g. at pH=7 the half-life of degradation is between 10 minutes and 65 hours while at higher pH-values the stability in solution for most compounds is much better. The stability profile is similar in solid phase. The degradation is catalyzed by acid reacting substances. The acid labile compounds are stabilized in mixtures with alkaline reacting substances. From what is said about the stability properties of the acid labile compounds listed above it is obvious that an oral dosage form of the said compounds must be protected from contact with the acid reacting gastric juice in order to reach the small intestine without degradation. Cores The acid labile compound is mixed with inert, preferably water soluble, conventional pharmaceutical constituents to obtain the preferred concentration of the active compound in the final mixture and with an alkaline reacting, otherwise inert, pharmaceutically acceptable substance (or substances), which creates a "micro-pH" around each particle of active compound of not less that pH=7, preferably not less than pH=8, when water is adsorbed to the particles of the mixture or when water is added in small amounts to the mixture. Such substances can be chosen among substances such as the sodium, potassium, calcium, magnesium and aluminium salts of phosphoric acid, carbonic acid, citric acid or other suitable weak inorganic or organic acids; substances normally used in antacid preparations such as aluminium, calcium and magnesium hydroxides; magnesium oxide or composite substances, such as A1₂O₃.6MgO.CO₂.12H₂O,(Mg₆A1₂(OH)₁₆CO₃.4H₂O), MgO.A1₂O₃. 2SiO₂.nH₂O or similar compounds; organic pH-buffering substances such as trihydroxymethylaminomethane or other similar, pharmaceutically acceptable pH-buffering substances. The stabilizing, high pH-value in the powder mixture can also be achieved by using an alkaline reacting salt of the active compound such as the sodium, potassium, magnesium, calcium salts of acid labile compounds, either alone or in combination with a conventional buffering substance as previously described. The powder mixture is then formulated into small beads i.e. pellets, or tablets, by conventional pharmaceutical procedures. The pellets or tablets are used as cores for further processing. Separating layer The alkaline reacting cores containing an acid labile compound must be separated from the enteric coating polymer(s) containing free carboxyl groups, which otherwise causes degradation/discolouration of the acid labile compound during the coating process or during storage. The subcoating layer, (the separating layer), also serves as a pH-buffering zone in which hydrogen ions diffusing from the outside in towards the alkaline core towards the surface of the coated particles. The pH-buffering properties of the separating layer can be further strengthened by introducing in the layer substances chosen from a group of compounds usually used in antacid formulations such as, for instance, magnesium oxide, hydroxide or carbonate, aluminium or calcium hydroxide, carbonate or silicate; composite aluminium/magnesium compounds such as, for instance A1₂O₃·6MgO·CO₂12H₂O, (Mg₆A1₂(OH)₁₆CO₃·4H₂O), MgO·A1₂O₃·2SiO₂·nH₂O, wherein n not is an integer and less than 2 or similar compounds; or other pharmaceutically acceptable pH-buffering compounds such as, for instance the sodium, potassium, calcium, magnesium and aluminium salts of phosphoric, citric or other suitable, weak, inorganic or organic acids. The separating layer consists of one or more water soluble inert layer, optionally containing pH-buffering compounds. The separating layer(s) can be applied to the cores - pellets or tablets - by conventional coating procedures in a suitable coating pan or in a fluidized bed apparatus using water and/or conventional organic solvents for the coating solution. The material for the separating layer is chosen among the pharmaceutically acceptable, water soluble, inert compounds or polymers used for film-coating applications such as, for instance, sugar, polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol, hydroxypropyl cellulose, hydroxymethyl cellulose or hydroxypropyl methylcellulose. The thickness of the separating layer is not less than 2 µm, for small spherical pellets preferably not less than 4 µm, for tablets preferably not less than 10 µm. In the case of tablets another method to apply the coating can be performed by the drycoating technique. First a tablet containing the acid labile compound is compressed as described above. Around this tablet a layer is compressed using a suitable tableting machine. The outer, separating layer, consists of pharmaceutically acceptable, in water soluble or in water rapidly disintegrating tablet excipients. The separating layer has a thickness of not less than 1 mm. Ordinary plasticizers colorants, pigments, titanium dioxide, talc and other additives may also be included into the separating layer. The enteric layer coating layer is applied on to the subcoated cores by conventional coating techniques such as, for instance, pan coating or fluidized bed coating using solutions of polymers in water and/or suitable organic solvents or by using latex suspensions of said polymers. As enteric coating polymers can be used, for example, cellulose acetate phthalate, hydroxypropyl methylcellulose phthalate, polyvinyl acetate phthalate, co-polymerized methacrylic acid/methacrylic acid methyl esters such as, for instance, compounds known under the trade name Eudragit ® L 12,5 or Eudragit ®L 100 (Röhm Pharma), or similar compounds used to obtain enteric coatings. The enteric coating can also be applied using water-based polymer dispersions, e.g. Aquateric® (FMC Corporation), Eudragit® L100-55 (Röhm Pharma), Coating CE 5142 (BASF). The enteric coating layer can optionally contain a pharmaceutically acceptable plasticizer such as, for instance, cetanol, triacetin, citric acid esters such as, for instance, those known under the trade name Citroflex® (Pfizer), phthalic acid esters, dibutyl succinate or similar plasticizers. The amount of plasticizer is usually optimized for each enteric coating polymer(s) and is usually in the range of 1-20% of the enteric coating polymer(s). Dispersants such as talc, colourants and pigments may also be included into the enteric coating layer. Thus, the special preparation according to the invention consists of cores containing the acid labile compound mixed with an alkaline reacting compound or cores containing an alkaline salt of the acid labile compound optionally mixed with an alkaline reacting compound. The cores suspended in water forms a solution or a suspension which has a pH, which is higher than that of a solution in which the polymer used for enteric coating is just soluble. The cores are coated with a water soluble or in water rapidly disintegrating coating, optionally containing a pH-buffering substance, which separates the alkaline cores from the enteric coating. Without this separating layer the resistance towards gastric juice would be too short and the storage stability of the dosage form would be unacceptably short. The sub-coated dosage form is finally coated with an enteric coating rendering the dosage form insoluble in acid media, but rapidly disintegrating/dissolving in neutral to alkaline media such as, for instance, the liquids present in the proximal part of the small intestine, the site where dissolution is wanted. Final dosage form The final dosage form is either an enteric coated tablet or capsule or in the case of enteric coated pellets, pellets dispensed in hard gelatin capsules or sachets or pellets formulated into tablets. It is essential for the long term stability during storage that the water content of the final dosage form containing acid labile compound (enteric coated tablets, capsules or pellets) is kept low, preferably not exceeding 1.5 % by weight. A process for the manufacture of the oral dosage form represents a further aspect of the invention. After the forming of the cores the cores are first coated with the separating layer and then with the enteric coating layer. The coating is carried out as described above. The preparation according to the invention is especially advantageous in reducing gastric acid secretion and/or providing a gastrointestinal cytoprotective effect. It is administered one to several times a day. The typical daily dose of the active substance varies and will depend on various factors such as the individual requirements of the patients, the mode of administration and disease. In general the dosage will be in the range of 1 to 400 mg per day of active substance. A method for the treatment of such conditions using the novel oral dosage form represents a further aspect of the invention. The invention is described in detail in the following examples: EXAMPLES Examples 1-3 exemplify the invention. Example 1 Uncoated pellets The dry ingredients (I) were premixed in a mixer. Addition of a granulation liquid (II) containing the suspended active compound was made and the mass was wet-mixed to a proper consistency. The wet mass was pressed through an extruder and spheronized to pellets. The pellets were dried and classified into suitable particle size ranges. Subcoated pellets The polymer solution (III) was sprayed onto the uncoated pellets in a fluidized bed apparatus. The spray guns were placed above the fluidized bed. Enteric coated pellets The polymer solution (IV) was sprayed on the subcoated pellets in a fluidized bed apparatus with spray guns placed above the bed. After drying to a water content of 0.5 % the enteric coated pellets were classified and filled into hard gelatin capsules in an amount of 284 mg, corresponding to 25 mg of active compound 1. 30 capsules were packed in tight containers together with a desiccant. Example 2 Formulation with the sodium salt of compound 2 according to Table 1. Uncoated pellets The preparation was made as described in Example 1 with the exception that the sodium salt of compound 2 was added together with the other ingredients in mixture 1. Subcoated pellets The two subcoat layers, III and IV, were applied to the uncoated pellets in a fluidized bed apparatus in consecutive order as previously described. Enteric coated pellets The preparation of enteric coated pellets was performed as described in Example 1. Example 3 Formulation with compound 6, according to Table 1. This example gives the composition of one unit dose according to the invention. Tablet core Compound 6, Table 1 15 mg Lactose 119 mg Hydroxypropyl cellulose (low substitution) 5 mg Hydroxypropyl cellulose 1 mg Talc 5 mg Mg(OH)₂ 15 mg TOTAL 160 mg Tablet cores having the composition above and each weighing 160 mg were first made by known techniques. Separating layer (inner) Hydroxypropyl cellulose 2 mg Synthetic hydrotalcite [A1₂O₃·6MgO·CO₂·12H₂O] 0.3 mg Separating layer (outer) Hydroxypropyl cellulose 2 mg The two separating layers were applied to the cores by known coating techniques. Enteric coating layer Hydroxypropyl methylcellulose phthalate 7 mg Cetyl alcohol 0.5 mg The enteric coating solution was sprayed on the cores coated by the two separating layers by known enteric coating techniques.

Claims: The use of a subcoating which is comprised of one or more inert reacting subcoating layers comprising tablet excipients which are soluble or rapidly disintegrating in water, or polymeric, water soluble, film-forming compounds, optionally containing pH-buffering, alkaline compounds, in order to obtain stability to discolouration in an oral pharmaceutical formulation containing as the active ingredient (i) an acid labile compound of the general formula I wherein A is an optionally substituted heterocyclic group, R¹, R², R³ and R⁴ are the same or different and are hydrogen, lower alkyl, lower alkoxy, -CF₃, alkyl or halogen and R⁵ is H or a lower alkyl group wherein "lower" denotes 1-6 carbon atoms, except the compound omeprazole (5-methoxy-2[[(4-methoxy-3,5 dimethyl-2-pyridinyl) methyl] sulfinyl]- 1H -benzimidazole), together with an alkaline reacting compound, or 2-[(2-dimethylamino-benzyl)sulfinyl]-benzimidazole together with an alkaline reacting compound, or (ii) an alkaline salt of a compound of formula I optionally together with an alkaline reacting compound, or an alkaline salt of 2-[(2-dimethylamino-benzyl)sulfinyl]-benzimidazole optionally together with an alkaline reacting compound; and an enteric coating, between which and the alkaline reacting core the subcoating is placed, which core material is in the form of small beads or tablets. The use according to claim 1 wherein the subcoating comprises hydroxypropyl methylcellulose, hydroxypropyl cellulose or polyvinylpyrrolidone. The use according to claim 1 wherein the subcoating comprises two or more sub-layers and where the inner layer comprises one or more of magnesium oxide, magnesium hydroxide or composite substance Al₂O₃.6MgO₂O or MgO.Al₂O₃.2SiO₂.nH₂O, wherein n ist an integer and less than two. The use according to claim 1 wherein the alkaline core comprises the acid labile compound and pH-buffering alkaline compound rendering to the microenvironment of the acid labile compound a pH of 7-12. The use according to claim 4 wherein the alkaline compound comprises one or more of magnesium oxide, hydroxide or carbonate, aluminium hydroxide, aluminium, calcium, sodium or potassium carbonate, phosphate or citrate, the composite aluminium/magnesium compounds Al₂O₃.6MgO.CO₂.12H₂O or MgO.Al₂O₃.2SiO₂.nH₂O, wherein n not is an integer and less than two. The use according to claim 1 wherein the alkaline core comprises an alkaline salt of the acid labile compound such as the sodium, potassium, magnesium, calcium or ammonium salt. The use according to claim 5 wherein the alkaline core comprises an alkaline salt of the acid labile compound mixed with an inert, alkaline compound. The use according to claim 1 wherein the enteric coating comprises hydroxypropyl methylcellulose phthalate, cellulose acetate phthalate, co-polymerized methacrylic acid/methacrylic acid methyl ester or polyvinyl acetate phthalate, optionally containing a plasticizer. The use according to claim 1 wherein the water content of the final dosage form containing the acid labile compound does not exceed 1.5 % by weight.

Inventors: LOEVGREN KURT, MORIGAKI SATOSHI, ODA MINORU, OHISHI NAOHIRO, PILBRANT AKE, YASUMURA MITSURU, LOEVGREN, KURT, MORIGAKI, SATOSHI, ODA, MINORU, OHISHI, NAOHIRO, PILBRANT, AKE, YASUMURA, MITSURU, Lövgren, Kurt
Applicants: HAESSLE AB, AKTIEBOLAGET HAESSLE
Application year: 1987
Main classification: A61K9
IPC codes: A61K9