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Claims for Patent: 6,780,881

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Claims for Patent: 6,780,881

Title: Freeze-dried pantoprazole preparation and pantoprazole injection
Abstract:Lyophilized pantoprazole preparations which are obtainable by freeze-drying of an aqueous solution of pantoprazole, ethylenediamine tetraacetic acid and/or a suitable salt thereof, and sodium hydroxide and/or sodium carbonate are disclosed. The preparations have advantageous properties when reconstituted for injection.
Inventor(s): Linder; Rudolf (Constance, DE), Dietrich; Rango (Constance, DE)
Assignee: Altana Pharma AG (Constance, DE)
Application Number:10/195,062
Patent Claims: 1. Process for the production of a freeze-dried preparation comprising 5-difluoromethoxy-2-[(3,4-di-methoxy-2-pyridinyl)methylsulfinyl]-1H-benzim idazole (pantoprazole), a salt thereof, a solvate of pantoprazole or a salt thereof, comprising freeze-drying of an aqueous solution of pantoprazole, a salt thereof, a solvate of pantoprazole or a salt thereof, ethylenedlamine tetraacetic acid and/or a suitable salt thereof, and sodium hydroxide and/or sodium carbonate, wherein upon dissolution in an aqueous solvent, the preparation has less than 130 subvisible particles per vial, the particles having a size equal to or greater than 10 .mu.m, wherein the number of particles is determined according to USP 24 by light obscuration particle test count.

2. Process according to claim 1, wherein the solution is prepared by the following steps: a. dissolving ethylenediamine tetraacetic acid and/or a suitable salt thereof in water, b. adjusting the pH of the solution to 8 or above 8 by adding sodium hydroxide and/or sodium carbonate to the solution, and c. adding pantoprazole, a salt thereof, a solvate of pantoprazole or a salt thereof, to the solution.

3. Process according to claim 1, wherein the ethylenedlamine tetraacetic acid and/or suitable salt thereof is present in an amount from about 0.05 to about 25% by weight, based on the amount of pantoprazole present.

4. Process according to claim 1, wherein the pantoprazole used in the step of freeze-drying is pantoprazole sodium sesquihydrate.

5. Process according to claim 1, wherein the aqueous solution has a pH of between about 10 to about 13.

6. Process according to claim 1, wherein the aqueous solution has a pH of between about 10.5 to about 11.5.

7. Process according to claim 1, wherein the aqueous solution has a pH of between about 10.75 to about 11.25.

8. Process according to claim 1, wherein the aqueous solution has a pH value that is selected from the group consisting of 10.75, 10.8, 10.85, 10.9, 10.95, 11, 11.05, 11.1, 11.15, 11.2, and 11.25.

9. Process according to claim 1, wherein ethylenediamine tetraacetic acid and/or suitable salt thereof is present in an amount from about 0.25 to about 12.5% by weight, based on the amount of pantoprazole present.

10. Process according to claim 1, wherein the ethylenediamine tetraacetic acid and/or suitable salt thereof is present in an amount from about 1 to about 5% by weight, based on the amount of pantoprazole present.

11. Process according to claim 1, wherein the preparation has less than 120 subvisible particles per vial upon dissolution in an aqueous solvent.

12. Process according to claim 1, wherein the pantoprazole used in the step of freeze-drying is pantoprazole sodium.

13. Process according to claim 1, wherein the pantoprazole used in th step of freeze-drying is pantoprazole magnesium.

14. Process according to claim 1, wherein the pantoprazole used in the step of freeze-drying is pantoprazole magnesium dihydrate.

15. Lyophilized pantoprazole preparation obtainable by a process according to claim 1.

16. Injection kit comprising a lyophilized pantoprazole preparation according to claim 15 and an aqueous solvent for bolus administration.

17. Pantoprazole injection for bolus administration obtainable by reconstitution of the pantoprazole preparation according to claim 15 in an aqueous solvent.

18. Pantoprazole injection according to claim 17, wherein the solvent is physiological saline.

19. Pantoprazole injection having less than 130 subvisible particles per vial, the particles having a site equal to or greater than 10 .mu.m, wherein the number of particles is determined according to USP 24 by light obscuration particle test count.

20. Pantoprazole injection according to claim 19, having less than 120 subvisible particles per vial.

21. Pantoprazole injection according to claim 19, wherein the pantoprazole is present therein is obtained from pantoprazole sodium sesquihydrate.

22. Pantoprazole injection according to claim 19, wherein the pantoprazole is present therein is obtained from pantoprazole sodium.

23. Pantoprazole injection according to claim 19, wherein the pantoprazole is present therein is obtained from pantoprazole magnesium.

24. Pantoprazole injection according to claim 19, wherein the pantoprazole is present therein is obtained from pantoprazole magnesium dihydrate.
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