Formulations and methods for lyophilization and lyophilates provided thereby

Abstract

The present invention provides compositions, methods for lyophilizing compounds and making pharmaceutical compositions, and kits providing solutions and lyophilized formulations of compounds. The compositions, methods, and kits are particularly useful in pharmaceutical applications involving therapeutic agents that have low solubility at low pH and medium pH values. Certain embodiments provide methods for lyophilizing compounds in liquid solutions, which include the steps of a) preparing aqueous solutions of a compound of interest in the absence of buffer; b) adjusting the pH to high values of pH in order to increase the solubility of the compound of interest; and c) freeze-drying the solution to provide a lyophilized solid composition. Aqueous solutions including buffer are also disclosed. Lyophilized formulations, including micronized and non-micronized powders, are provided.

1 . A method for preparing an infusion solution, the method comprising:
 a) reconstituting a lyophilized composition comprising:   i) glibenclamide or a pharmaceutically acceptable salt thereof,   ii) at least one substantially pharmaceutically inert compound selected from the group consisting of glucose, fructose, mannose, galactose, mannitol, sorbitol, lactose, trehalose, sucrose, sodium chloride and potassium chloride, and   iii) one or more alkali bases,   in water at a concentration of about 0.2 mg/mL to about 1.0 mg/mL of the glibenclamide or a pharmaceutically acceptable salt thereof to form a reconstituted pharmaceutical formulation having a pH greater than 8,   wherein the lyophilized composition is stable for at least 3 months at 25° C. and 60% relative humidity; and   b) diluting the reconstituted pharmaceutical formulation in a saline solution to form the infusion solution.   
     
     
         2 . The method of  claim 1 , wherein the weight of the one or more of glucose, fructose, mannose, galactose, mannitol, sorbitol, lactose, trehalose, sucrose, sodium chloride, and potassium chloride is at least about 10 times the weight of glibenclamide or a pharmaceutically acceptable salt thereof in the lyophilized composition. 
     
     
         3 . The method of  claim 1 , wherein the lyophilized composition is a powder. 
     
     
         4 . The method of  claim 1 , wherein the at least one substantially pharmaceutically inert compound is mannitol. 
     
     
         5 . The method of  claim 1 , wherein the one or more alkali bases is sodium hydroxide or potassium hydroxide. 
     
     
         6 . The method of  claim 1 , wherein the at least one substantially pharmaceutically inert compound is mannitol and the one or more alkali bases comprise sodium hydroxide. 
     
     
         7 . The method of  claim 1 , wherein the lyophilized composition contains said one or more alkali bases in an amount sufficient such that when said lyophilized composition is reconstituted at a concentration of about 0.2 mg/mL to about 1.0 mg/mL of the glibenclamide or a pharmaceutically acceptable salt thereof, its pH is greater than 10. 
     
     
         8 . The method of  claim 1 , wherein the lyophilized composition further includes a buffer. 
     
     
         9 . The method of  claim 1 , wherein glibenclamide is in the form of a pharmaceutically acceptable salt. 
     
     
         10 . The method of  claim 1 , wherein the lyophilized composition contains less than 0.1% w/w of agents that enhance the solubility of glibenclamide. 
     
     
         11 . The method of  claim 1 , wherein said reconstituted pharmaceutical formulation comprises glibenclamide or a pharmaceutically acceptable salt thereof at a concentration of about 1 mg/ml. 
     
     
         12 . The method of  claim 1 , wherein said reconstituted pharmaceutical formulation comprises glibenclamide or a pharmaceutically acceptable salt thereof, mannitol, sodium hydroxide, and water, and has an osmolality of 200 mOsm to 400 mOsm. 
     
     
         13 . The method of  claim 1 , wherein said reconstituted pharmaceutical formulation is suitable for intravenous administration, bolus injection, or intravenous infusion. 
     
     
         14 . The method of  claim 1 , wherein said reconstituted pharmaceutical formulation comprises a second pharmaceutically active compound. 
     
     
         15 . A container containing a lyophilized composition that comprises:
 a) glibenclamide or a pharmaceutically acceptable salt thereof;   b) at least one substantially pharmaceutically inert compound selected from the group consisting of glucose, fructose, mannose, galactose, mannitol, sorbitol, lactose, trehalose, sucrose, sodium chloride and potassium chloride; and   c) one or more alkali bases,   wherein the lyophilized composition is stable for at least 3 months at 25° C. and 60% relative humidity.   
     
     
         16 . The container of  claim 15 , wherein the at least one substantially pharmaceutically inert compound is mannitol. 
     
     
         17 . The container of  claim 15 , wherein the one or more alkali bases is sodium hydroxide or potassium hydroxide. 
     
     
         18 . The container of  claim 15 , wherein the at least one substantially pharmaceutically inert compound is mannitol and the one or more alkali bases comprise sodium hydroxide. 
     
     
         19 . The container of  claim 15 , wherein glibenclamide is in the form of a pharmaceutically acceptable salt of glibenclamide. 
     
     
         20 . A kit comprising the container of  claim 15  and a vial containing a diluent.