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Details for Patent: 7,115,250

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Details for Patent: 7,115,250

Title:Delivery of erectile dysfunction drugs through an inhalation route
Abstract: The present invention relates to the delivery of erectile dysfunction drugs through an inhalation route. Specifically, it relates to aerosols containing erectile dysfunction drugs that are used in inhalation therapy. In a method aspect of the present invention, an erectile dysfunction drug is delivered to a patient through an inhalation route. The method comprises: a) heating a composition, wherein the composition comprises an erectile dysfunction drug, to form a vapor; and, b) allowing the vapor to cool, thereby forming a condensation aerosol comprising particles with less than 5% erectile dysfunction drug degradation products. In a kit aspect of the present invention, a kit for delivering an erectile dysfunction drug through an inhalation route is provided which comprises: a) a thin coating of an erectile dysfunction drug composition and b) a device for dispensing said thin coating as a condensation aerosol.
Inventor(s): Rabinowitz; Joshua D. (Mountian View, CA), Zaffaroni; Alejandro C. (Atherton, CA)
Assignee: Alexza Pharmaceuticals, Inc. (Palo Alto, CA)
Filing Date:Dec 30, 2003
Application Number:10/749,535
Claims:1. A method of treating erectile dysfunction in a patient comprising administering a therapeutic amount of a drug condensation aerosol to the patient by inhalation, wherein the drug is selected from the group consisting of sildenafil, tadalafil and vardenafil, and wherein the condensation aerosol is formed by heating a thin layer containing the drug, on a solid support, to produce a vapor of the drug, and condensing the vapor to form a condensation aerosol characterized by less than 10% drug degradation products by weight, and an MMAD of less than 5 microns.

2. The method according to claim 1, wherein the condensation aerosol is characterized by an MMAD of less than 3 microns.

3. The method according to claim 1, wherein peak plasma drug concentration is reached in less than 0.1 hours.

4. The method according to claim 1, wherein the condensation aerosol is formed at a rate greater than 0.5 mg/second.

5. The method according to claim 1, wherein at least 50% by weight of the condensation aerosol is amorphous in form.

6. The method according to claim 1, wherein the therapeutic amount of a drug condensation aerosol comprises between 5 mg and 40 mg of sildenafil delivered in a single inspiration.

7. The method according to claim 1, wherein the therapeutic amount of a drug condensation aerosol comprises between 2.5 mg and 20 mg of tadalafil delivered in a single inspiration.

8. The method according to claim 1, wherein the therapeutic amount of a drug condensation aerosol comprises between 1 mg and 20 mg of vardenafil delivered in a single inspiration.

9. A method of administering a drug condensation aerosol to a patient comprising administering the drug condensation aerosol to the patient by inhalation, wherein the drug is selected from the group consisting of sildenafil, tadalafil and vardenafil, and wherein the drug condensation aerosol is formed by heating a thin layer containing the drug, on a solid support, to produce a vapor of the drug, and condensing the vapor to form a condensation aerosol characterized by less than 10% drug degradation products by weight, and an MMAD of less than 5 micron.

10. A kit for delivering a drug condensation aerosol comprising: a. a thin layer containing the drug, on a solid support, wherein the drug is selected from the group consisting of sildenafil, tadalafil and vardenafil, and b. a device for providing the condensation aerosol, wherein the condensation aerosol is formed by heating the thin layer to produce a vapor of the drug, and condensing the vapor to form a condensation aerosol characterized by less than 10% drug degradation products by weight, and an MMAD of less than 5 microns.

11. The kit according to claim 10, wherein the device comprises: a. a flow through enclosure containing the solid support, b. a power source that can be activated to heat the solid support, and c. at least one portal through which air can be drawn by inhalation, wherein activation of the power source is effective to produce a vapor of the drug, and drawing air through the enclosure is effective to condense the vapor to form the condensation aerosol.

12. The kit according to claim 11, wherein the heat for heating the solid support is generated by an exothermic chemical reaction.

13. The kit according to claim 12, wherein the exothermic chemical reaction is oxidation of combustible materials.

14. The kit according to claim 11, wherein the heat for heating the solid support is generated by passage of current through an electrical resistance element.

15. The kit according to claim 11, wherein said solid support has a surface area dimensioned to accommodate a therapeutic dose of the drug.

16. The kit according to claim 10, wherein peak plasma drug concentration is reached in less than 0.1 hours.

17. The kit according to claim 10, further including instructions for use.

18. The method according to claim 1, wherein the condensation aerosol is characterized by an MMAD of 0.2 to 5 microns.

19. The method according to claim 2, wherein the condensation aerosol is characterized by an MMAD of 0.2 to 3 microns.

20. The method according to claim 9, wherein the drug is sildenafil.

21. The method according to claim 9, wherein the drug is tadalafil.

22. The method according to claim 9, wherein the drug is vardenafil.

23. The kit according to claim 10, wherein the condensation aerosol is characterized by an MMAD of less than 3 microns.

24. The kit according to claim 10, wherein the condensation aerosol is characterized by an MMAD of 0.2 to 5 microns.

25. The kit according to claim 23, wherein the condensation aerosol is characterized by an MMAD of 0.2 to 3 microns.

26. The kit according to claim 10, wherein the drug is sildenafil.

27. The kit according to claim 10, wherein the drug is tadalafil.

28. The kit according to claim 10, wherein the drug is vardenafil.

29. The kit according to claim 11, wherein the solid support has a surface to mass ratio of greater than 1 cm.sup.2 per gram.

30. The kit according to claim 11, wherein the solid support has a surface to volume ratio of greater than 100 per meter.

31. The kit according to claim 11, wherein the solid support is a metal foil.

32. The kit according to claim 31, wherein the metal foil has a thickness of less than 0.25 mm.
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