Abstract: The present invention provides surface-stabilized amorphous pharmaceuticals comprising an amorphous pharmaceutical substrate coated with a biocompatible immobilizing material. Amorphous pharmaceutical substrates that are prone to surface enhanced crystallization benefit from the present coatings. The coated amorphous pharmaceuticals of the present invention maintain their amorphous state and, therefore, their solubility over extended periods of time, relative to uncoated pharmaceuticals.

Abstract: The invention relates to an amorphous non-crystalline glass form (Form-II) of 3R,4S,5S,6R,7R,9R,11S,12R,13S,14R-6-[(2S,3R,4S,6R)-4-dimethylamino-3-hydroxy-6-methyloxan-2-yl]oxy-14-ethyl-7,12,13-trihydroxy-4-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-10-(2-methoxyethoxymethoxyimino)-3,5,7,9,11,13-hexamethyl-1-oxa-cyclotetradecan-2-one or roxithromycin having at least one characteristic infra-red spectrum peak at approximately 3580 to 3464 cm?1. The invention further relates to a preparation method of increasing the solubility of roxithromycin including the steps of selecting anhydrous roxithromycin or monohydrated roxithromycin; elevating the temperature of the roxithromycin to above the melting point thereof; and reducing the temperature of the melt sufficiently to allow it to set into an amorphous non-crystalline glass form (Form-II) of roxithromycin having relatively increased solubility without decreasing the stability of thereof.

Abstract: The invention relates to an amorphous non-crystalline glass form (Form-ll) of 3R,4S,5S,6R,7R,9R,11S,12R,13S,14R-6-[(2S,3R,4S,6R)-4-dimethylamino-3-hydroxy-6-methyloxan-2-yl]oxy-14-ethyl-7,12,13-trihydroxy-4-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-10-(2-methoxyethoxymethoxyimino)-3,5,7,9,11,13-hexamethyl-1-oxa-cyclotetradecan-2-one or roxithromycin having at least one characteristic infra-red spectrum peak at approximately 3580 to 3464 cm?1. The invention further relates to a preparation method of increasing the solubility of roxithromycin including the steps of selecting anhydrous roxithromycin or monohydrated roxithromycin; elevating the temperature of the roxithromycin to above the melting point thereof; and reducing the temperature of the melt sufficiently to allow it to set into an amorphous non-crystalline glass form (Form-ll) of roxithromycin having relatively increased solubility without decreasing the stability of thereof.

Abstract: The present invention provides surface-stabilized amorphous pharmaceuticals comprising an amorphous pharmaceutical substrate coated with a biocompatible immobilizing material. Amorphous pharmaceutical substrates that are prone to surface enhanced crystallization benefit from the present coatings. The coated amorphous pharmaceuticals of the present invention maintain their amorphous state and, therefore, their solubility over extended periods of time, relative to uncoated pharmaceuticals.