Process for the production of dry pharmaceutical forms and the thus obtained pharmaceutical compositions

Abstract

A process for the production of a solid dispersion of at least one therapeutic agent in a hydrophilic carrier having enhanced solubility in an aqueous media comprising dissolving at least one therapeutic agent in a volatile organic solvent containing a very hydrophilic polymer and evaporating the solvent to dryness to form a co-precipitate of therapeutic agent and hydrophilic polymer and the resulting products and their therapeutic method of use.

1. A process for the production of a solid dispersion of 1 to 20% by weight of a surface active agent, 10 to 60% by weight of at least one therapeutic agent selected from the group consisting of progesterone and a mixture of progesterone and estradiol or an ester or ether thereof in a hydrophilic carrier having enhanced solubility in an aqueous media comprising dissolving the therapeutic agent in a volatile organic solvent containing a very hydrophilic polymer and the surface active agent in the said percentage and without strong heat or vacuum evaporating the solvent to dryness to form a co-precipitate of therapeutic agent and , hydrophilic polymer and surface active agent. 
     
     
       2. The process of  claim 1  wherein the co-precipitate is ground and screened to obtain a uniform powder. 
     
     
       3. The process of  claim 1  wherein the evaporation to dryness of the organic solution is carried out in a fluidized bed of air. 
     
     
       4. The process of  claim 1  wherein the volatile organic solvent is an oxygenated solvent or a chlorinated solvent. 
     
     
       5. The process of  claim 1  wherein the volatile organic solvent is an alkanol. 
     
     
       6. The process of  claim 1  wherein the volatile organic solvent is methylene chloride. 
     
     
       7. The process of  claim 1  wherein the volatile organic solvent is selected from the group consisting of ethanol, isopropanol and terbutanol. 
     
     
       8. The process of  claim 1  wherein the very hydrophilic polymer is selected from the group consisting of polyvinylpyrrolidones, N-methylpyrrolidones, N-methylcaprolactam and the N-methylpiperidin 2-ones. 
     
     
       9. The process of  claim 1  wherein the polymer is polyvinyl pyrrolidones having a molecular weight ranging from 10.00 10,000 to 50,000. 
     
     
       10. The process of  claim 1  wherein the surface-active agent is a non-ionic surface-active agent. 
     
     
       11. The process of  claim 1  wherein the non-ionic surface active agent is selected from the group consisting of polyoxyethylenic ester of sorbitan and saturated and unsaturated fatty acids having at least 8 carbon atoms, polyoxyethylenic ethers of fatty alcohols having at least 8 carbon atoms, polyoxyethylenic ethers of fatty alcohols having at least 8 carbon atoms and polyoxyethylenic esters of stearic acids. 
     
     
       12. The process of  claim 1  wherein the surface-active agent is a polysorbate. 
     
     
       13. A solid dispersion with enhanced bioavailability of 1 to 20% by weight of a surface active agent, 10 to 60% by weight of at least one therapeutic agent selected from the group consisting of progesterone and an agent selected from the group consisting of progesterone and a mixture of progesterone and estradiol or an ester or ether thereof in a hydrophilic carrier having enhanced solubility in an aqueous media comprising dissolving the therapeutic agent in a volatile organic solvent containing a very hydrophilic polymer and the surface active agent in the said percentage and without strong heat or vacuum evaporating the solvent to dryness to form a co-precipitate of therapeutic agent and , hydrophilic polymer and surface active agent. 
     
     
       14. A solid dispersion with enhanced bioavilability of  claim 13  wherein the therapeutic agent is a mixture of estradiol or one of its ester or ethers, and progesterone. 
     
     
       15. A pharmaceutical composition containing the solid dispersions obtained by  claim 2  wherein the solid dispersion of therapeutic agents are admixed with an inert non-toxic pharmaceutically-acceptable carrier. 
     
     
       16. A pharmaceutical composition of  claim 15  wherein the inert carrier is constituted by neutral pellets of starch. 
     
     
       17. A pharmaceutical composition of  claim 15  wherein the inert carrier is an aqueous sterile medium. 
     
     
       18. A method for treating disorders connected with a hormonal insufficiency comprising administering to a female patient in need of such a therapy, a safe but effective amount of a therapeutic agent consisting of progesterone or progesterone and estradiol or an ether or ester thereof in the form of a solid dispersion obtained by the process of  claim 1 . 
     
     
       19. The method of  claim 18  wherein the hormonal insufficiency is a luteal an estro- progestative  insufficiency and the therapeutic agent is a mixture of estradiol and progesterone. 
     
     
       20. The method of  claim 18  wherein the hormonal insufficiency is an estro-progestative insufficiency and the therapeutic agent is a mixture of estradiol and progesterone.