Cyclodextrin-drospirenone inclusion complexes

Abstract

Described are inclusion complexes formed between cyclodextrin and drospirenone. In a specific embodiment of the invention, the cyclodextrin is β-cyclodextrin. The invention further relates to methods of providing such an inclusion complex, and to the use of said inclusion complex for improving the solubility of drospirenone, for providing pharmaceutical compositions, for use as a medicament in the treatment of symptoms associated with menopause and in female contraception.

1 . An inclusion complex between cyclodextrin and drospirenone.  
     
     
         2 . The inclusion complex according to  claim 1 , wherein the cyclodextrin is selected from the group consisting of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin and derivatives thereof.  
     
     
         3 . The inclusion complex according to  claim 2 , wherein the cyclodextrin is β-cyclodextrin or γ-cyclodextrin.  
     
     
         4 . The inclusion complex according to  claim 3 , wherein the cyclodextrin is β-cyclodextrin.  
     
     
         5 . The inclusion complex according to  claim 1 , wherein the inclusion complex between drospirenone and the cyclodextrin is in a molar ratio, respectively, selected from the group consisting of 1:1, 2:1, 3:1, 3:2, 1:2, 2:2, 2:3 or 1:3.  
     
     
         6 . The inclusion complex according to  claim 5 , wherein the ratio is 1:1, 2:1 or 1:2.  
     
     
         7 . The inclusion complex according to  claim 1  further comprising one or more therapeutically active substances.  
     
     
         8 . A method for producing an inclusion complex of  claim 1  comprising combining cyclodextrin and drospirenone at a molar ratio of, respectively, from 0.3:1 to 20:1.  
     
     
         9 . The method of  claim 8 , wherein the ratio is 1:1, 2:1, 3:1, 4:1 or 5:1.  
     
     
         10 . The method of  claim 8 , wherein the ratio is 2:1 or 3:1.  
     
     
         11 . The method according to  claim 8 , comprising the combining of a solution of drospirenone with a solution of cyclodextrin.  
     
     
         12 . The method according to  claim 8 , comprising the combining of solid drospirenone with a solution of cyclodextrin.  
     
     
         13 . The method according to  claim 8 , wherein the cyclodextrin is in solution comprising a solvent selected from the group consisting of water, ethanol, acetone, acetonitrile, methanol, DMSO, pyridine or combinations thereof.  
     
     
         14 . The method of  claim 13 , wherein the solution comprises water.  
     
     
         15 . The method according to  8 , wherein the drospirenone is in solution comprising a solvent selected from the group consisting of water, ethanol, acetone, acetonitrile, methanol, DMSO, pyridine or combinations thereof.  
     
     
         16 . The method of  claim 15 , wherein the solution comprises water, ethanol or both.  
     
     
         17 . The method according to  claim 8  comprising; 
 dissolving cyclodextrin in water, optionally with heating, to form a cyclodextrin solution;  
 dissolving drospirenone in a solvent selected from the group consisting of water and ethanol or mixtures thereof, optionally with heating, to form a drospirenone solution;  
 combining the cyclodextrin solution and the drospirenone solution to form a combined solution;  
 stirring the combined solution;  
 filtering the resultant precipitate;  
 washing the precipitate with a solvent selected from the group consisting of water, ethanol, ether and acetone, preferably wherein the solvent is cooled to below 25° C.;  
 optionally suspending the resultant solid in a solvent and washing the suspended material with a solvent selected from the group consisting of water, ethanol, ether and acetone;  
 removing substantially all of the solvent from the resultant or suspended material.  
 
     
     
         18 . The method according to  claim 17 , wherein the removing of solvent is by spray drying.  
     
     
         19 . The method according to  claim 17 , wherein the removing of solvent is by lyophilization.  
     
     
         20 . The method according to  claim 8  further comprising combining a therapeutically active substance to a combined solution of drospirenone, to a drospirenone solution, or to a cyclodextrin solution.  
     
     
         21 . A method for improving the solubility of drospirenone in water comprising complexing drospirenone with cyclodextrin to form an inclusion complex.  
     
     
         22 . A pharmaceutical composition comprising an inclusion complex of drospirenone and cyclodextrin as defined by  claim 1  together with one or more pharmaceutically acceptable carriers or excipients.  
     
     
         23 . The pharmaceutical composition according to  claim 22  adapted to be administered by oral, parenteral, mucosal, topical, vaginal, subcutaneous or nasal administration.  
     
     
         24 . The pharmaceutical composition according to  claim 22 , wherein the amount of drospirenone is from approximately 0.1 mg to 10 mg.  
     
     
         25 . The pharmaceutical composition according to  claim 22  further comprising one or more therapeutically active substances.  
     
     
         26 . Use of the inclusion complex as defined by  claim 1  as a medicament.  
     
     
         27 . A method for female contraception comprising administering an inclusion complex as defined by  claim 1  to a female.  
     
     
         28 . A method for treating menopausal symptoms comprising administering an inclusion complex as defined by  claim 1  to a female.