Ketamine composition for use in a method of treatment of depression by pulmonary administration

1. A method of ftreating depression in a subject comprising administration to the lungs of the subject via pulmonary route of an inhalable pharmaceutical composition comprising ketamine or its isomer or its pharmaceutically acceptable salt, wherein said treating is performed in a dosage regimen that comprises a 10 days to a 30 days cycle of multiple administrations by inhalation, wherein each administration of the multiple administrations is performed on a single day with an interval of 2 to 4 days between each administration, wherein each administration of the multiple administrations consists of a sequence of multiple single dose inhalations, and wherein each single dose inhalation in said sequence is separated by a break period lasting about 15 minutes.

2. The method according to claim 1 , wherein the inhalable pharmaceutical composition is an inhalable dry powder composition.

3. The method according to claim 1 wherein pharmaceutically acceptable salt is hydrochloride.

4. The method according to claim 1 wherein ketamine is esketamine hydrochloride.

5. The method according to claim 1 wherein the inhalable pharmaceutical composition comprises one or more nominal unit doses of ketamine or its pharmaceutically acceptable salt, the ketamine or its pharmaceutically acceptable salt in the composition is in the form of micronized. ketamine, and said. micronized ketamine is present in the inhalable pharmaceutical composition in an amount of 2 mg to 100 mg calculated as a free base per nominal unit dose.

6. The method. according to claim 5 , wherein the micronized. ketamine is micronized esketamine, and. said micronized esketamine is present in the inhalable pharmaceutical composition in an amount of 2 to 40 mg calculated as a free base per nominal unit dose.

7. The method according to claim 6 , wherein the inhalable pharmaceutical composition comprises 4 mg of micronized esketamine calculated as a free base per nominal unit dose.

8. The method. according to claim. 2 , wherein the inhalable dry powder composition further comprises one or more additives selected from the group consisting of a carbohydrate bulking agent in an amount of 30 to 95% by weight and a stabilizing agent in an amount of 0.2-3% by weight, with respect to the total weight of the composition.

9. The method. according to claim 2 , wherein the inhalable dry powder composition comprises ketamine having median particle diameter d50 of 1-10 μm, d10 of 0.2-5 μm and d90 of 3-35 μm, as measured by laser diffraction technique.

10. The method according to claim 5 , wherein the inhalable pharmaceutical composition. provides an emitted dose of at least 1.0 mg of ketamine calculated as a free base, corresponding to 1.2 mg of ketamine hydrochloride, wherein the emitted dose of ketamine is up to 97% of the amount of ketamine per nominal unit dose.

11. The method. according to claim 10 , wherein the fraction of the emitted dose delivered to the lungs is from 40% to 85%.

12. The method according to claim 2 , wherein the composition is incorporated in a blister with plurality of individual nominal unit doses premetered and individually sealed.

13. The method according to claim 2 , wherein the composition is incorporated in a capsule with a single nominal unit dose.

14. The method according to claim 1 , wherein the inhalable pharmaceutical composition is comprised in a multi-dose powder reservoir.

15. The method according to claim 1 , wherein said cycle lasts 12 to 14 days and comprises 4 administrations separated by 3 to 4 day intervals, each of the 4 administrations consisting of a sequence of multiple single dose inhalations.

16. The method according claim 15 , wherein the inhalable pharmaceutical composition comprises one or more nominal unit doses of ketamine or its pharmaceutically acceptable salt, the ketamine or its pharmaceutically acceptable salt in the composition. is in the form. of micronized ketamine, and said micronized ketamine is present in the inhalable pharmaceutical composition in an amount of 2 mg to 20 mg calculated as a free base per nominal unit dose.

17. The method according to claim 16 , wherein the inhalable pharmaceutical composition provides an emitted dose inhalation of at least 1.0 mg of ketamine calculated as a free base, in the form of and. corresponding to 1.2 mg of ketamine hydrochloride, wherein the emitted dose of ketamine is up to 97% of the amount of ketamine per nominal unit dose.

18. A method of treatment of depression, by administration of an inhalable dry powder pharmaceutical composition comprising one or more nominal unit doses of micronized esketamine hydrochloride to the lungs via pulmonary route, wherein said treatment is performed in a dosage regimen that comprises a cycle of multiple sequences of administration by inhalation, said cycle lasting from 10 days to 30 days, wherein each of multiple sequences of administration is performed in a single day, with 2 to 4 day intervals between sequences, and each of said sequences consists of multiple single dose inhalations separated by a break period lasting from 5 to 15 minutes, wherein said micronized esketamine hydrochloride is present in the inhalable dry powder pharmaceutical composition in an amount of 2 mg to 20 mg calculated as a free base per nominal unit dose.

19. The method of claim 18 , wherein each of said sequences of administration consists of three single dose inhalations.

20. The method of claim 17 , wherein each administration of the multiple administrations consists of a sequence of three single dose inhalations.