The invention relates to pharmaceutical compositions for direct systemic introduction, are also known as DSI pharmaceutical compositions, for used as human veterinary pharmaceutical compositions. In one embodiment, the invention relates to a pharmaceutical composition for direct system introduction comprising bovine gelatin, mannitol, an optional surfactant, an optional flavorant, and an active pharmaceutical ingredient. A DSI pharmaceutical composition of the invention has a disintegration time of 7 seconds or less in deionized water maintained at 37.0° C.±0.5° C. The invention also relates to a method of delivering an active pharmaceutical ingredient to an animal comprising the step of placing a DSI pharmaceutical composition of the invention into a mucosal cavity of an animal to be treated with the active pharmaceutical ingredient and to the corresponding methods of treatment.