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Claims for Patent: 5,753,265

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Claims for Patent: 5,753,265

Title: Multiple unit pharmaceutical preparation
Abstract:A new pharmaceutical multiple unit tableted dosage form containing as active ingredient an acid labile H.sup.+ K.sup.+ -ATPase inhibitor or an alkaline salt thereof or one of its single enantiomers or an alkaline salt thereof, a method for the manufacture of such a formulation, and the method of treatment with such a formulation in medicine.
Inventor(s): Bergstrand; Pontus John Arvid (Gothenburg, SE), Lovgren; Kurt Ingmar (Molndal, SE)
Assignee: Astra Aktiebolag (Sodertalje, SE)
Application Number:08/464,774
Patent Claims: 1. An oral pharmaceutical composition in the form of a multiple unit tablet comprising:

a tablet excipient;

a multiple of a core unit comprising as an active ingredient an acid-labile H.sup.+ K.sup.+ -ATPase inhibitor compound in a neutral form or a salt form, a single enantiomer or an alkaline salt of a single enantiomer;

the core unit being covered with at least one enteric coating layer having mechanical properties so as not to significantly affect the acid resistance of the enteric coating layered unit by compression during tableting.

2. The composition according to claim 1, wherein the active ingredient is a compound of the general formula I or an alkaline salt thereof or one of its single enantiomers or an alkaline salt thereof ##STR5## wherein Het.sub.1 is ##STR6## Het.sub.2 is ##STR7## ##STR8## wherein N in the benzimidazole moiety means that one of the carbon atoms substituted by R.sub.6 --R.sub.9 may be exchanged for a nitrogen atom without any substituents;

R1, R2 and R.sub.3 are the same or different and selected from the group consisting of hydrogen, alkyl, alkoxy unsubstituted or substituted by fluorine, alkylthio, alkoxyalkoxy, dialkylamino, piperidino, morpholino, halogen, phenyl and phenylalkoxy;

R.sub.4 and R.sub.5 are the same or different and selected from the group consisting of hydrogen, alkyl and arylalkyl;

R'.sub.6 is hydrogen, halogen, trifluoromethyl, alkyl or alkoxy;

R.sub.6 --R.sub.9 are the same or different and selected from the group consisting of hydrogen, alkyl, alkoxy, halogen, halo-alkoxy, alkylcarbonyl, alkoxycarbonyl, oxazolinyl, trifluoroalkyl, and adjacent groups R.sub.6 --R.sub.9 form ring structures which may be further substituted;

R.sub.10 is hydrogen or forms an alkylene chain together with R.sub.3, and

R.sub.11 and R.sub.12 are the same or different and selected from the group consisting of hydrogen, halogen and alkyl; except the compounds 5-methoxy-2[[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]sulfinyl]-1H-benzi midazole,5-fluoro-2[[(4-cyclopropylmethoxy-2-pyridinyl)methyl]sulfinyl]-1H- benzimidazole and 5-carbomethoxy-6-methyl-2[[(3,4-dimethoxy-2-pyridinyl)methyl]sulfinyl]-1H- benzimidazole or their single enantiomers or alkaline salts thereof.

3. The composition according to claim 1, wherein the active ingredient is one of the following compounds ##STR9## or an alkaline salt thereof or one of its single enantiomers or an alkaline salt thereof.

4. The composition according to claim 1, wherein the acid resistance of the individually enteric coating layered units is in compliance with the requirements on enteric coated articles defined in the United States Pharmacopeia.

5. The composition according to claim 1, wherein the acid resistance of the individually enteric coating layered units does not decrease more than 10% during the compression of the individually enteric coating layered units into the multiple unit tableted dosage form.

6. The composition according to claim 1, wherein the enteric coating layer covering the individual units comprises a plasticized enteric coating layer material.

7. The composition according to claim 1, wherein the enteric coating layer covering the individual units has a thickness of at least 10 .mu.m.

8. The composition according to claim 1, wherein the individually enteric coating layered units are further covered with an over-coating layer comprising pharmaceutically acceptable excipients.

9. The composition according to claim 1, wherein the dosage form is divisible.

10. The composition according to claim 1, wherein the dosage form is dispersible to a suspension of individually enteric coating layered units in an aqueous liquid.

11. The composition according to claim 1 further comprising a separating layer which comprises pharmaceutically acceptable excipients which are soluble, or insoluble but disintegrating in water.

12. The composition according to claim 1, wherein the core unit is a seed layered with the active ingredient.

13. The composition according to claim 12, wherein the seeds have a size of 0.1-2 mm.

14. A process for the manufacture of the pharmaceutical composition according to claim 1, which comprises the steps of

(a) shaping a core unit comprising the active ingredient as defined;

(b) covering the core unit with at least one enteric coating layer; and

(c) mixing a multiple of the enteric coated core unit with tablet excipients; and

(d) compressing a dosage of the mixture into tablet form; the enteric coating layer having mechanical properties so as not to affect the acid resistance of the enteric coated units.

15. A process according to claim 14, wherein the individually enteric coating layered units are further coated with an over-coating layer before compression of the individual units into the multiple unit tableted dosage form.

16. The composition according to claim 1, wherein the core unit comprises an alkaline compound.

17. The composition according to claim 11, wherein the separating layer comprises an alkaline excipient.

18. The process according to claim 14, wherein the individual core unit of step (a) further comprises an alkaline compound.

19. The process according to claim 14, wherein the individual core unit is covered with a separating layer located under the enteric coating layer.

20. A press-through blister package comprising a plurality of press-through blisters each containing the composition according to any of the claims 1 to 16 or 17.

21. A method for inhibiting gastric acid secretion in mammals and man comprising administering to a host in need thereof a therapeutically effective dose of a composition according to any of claims 1-16 or 17.

22. A method for the treatment of gastrointestinal inflammatory disease in mammals and man comprising administering to a host in need thereof a therapeutically effective dose of a composition according to any of the claims 1-16 or 17.

23. A press-through blister package comprising at least one press-through blister: comprising a tableted dosage form of the composition according to any of the claims 1 to 16 or 17.
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