The invention relates to a sustained release pharmaceutical composition of somatostatin, or an analog of somatostatin, for its use in treating and/or preventing diarrhea and its use in preparing a medicinal product for treating and/or preventing diarrhea.本發明關於用於治療及/或預防下痢之生長抑素或生長抑素之類似物之持續釋放型藥學組成物,及其於製備醫藥產品以治療及/或預防下痢之用途。