Method for the preparation of pearls and pearls obtained containing an active ingredient with an undefined crystallization point

摘要

Pearls of an active principle exhibiting an indefinite crystallization point, wherein said pearls exhibit a prolonged, immediate or combination release profiles, are made by melting the active principle and a crystallization excipient to create a molten mixture; introducing the mixture into feed receptacles of a prilling tower; passing the mixture through a nozzle which is vibrated to form pearls; and allowing the pearls to fall in the tower countercurrentwise to cold air, where the tower is provided with a fluidized bed proximate the bottom of the tower and the temperature conditions of the said fluidized bed are maintained depending on the release profile desired.