Pharmaceutical composition comprising a medicament and a water-swellable polymer

摘要

Pharmaceutical compositions for release of a biologically active substance into a desired environment, comprising a biologically active substance, a water swellable polymer material and optionally one or more accessory ingredients, characterised in that the water-swellable polymer material constitutes no more than 7% by weight of the said composition. The compositions are particularly useful for oral administration to the rumen of an animal.