Capsules are divided into gastric soluble capsules and enteric soluble capsules, gastric soluble capsules can be digested in about 2 to 3 hours in the stomach, enteric soluble capsules will not be digested in the stomach. 1. Gastrolytic capsules: gastrolytic capsules enter the stomach after pepsinogen and gastric acid immersion, 2 to 3 hours or so can be digested, the drugs inside the capsule will be released, to achieve the purpose of the treatment of disease. 2. enteric capsules: enteric capsules are dissolved in the human small intestine will be absorbed in the capsule, the capsule added a special medicinal polymer materials, so that it is not easy to dissolve in gastric juice, only in the intestinal tract dissolved in the decomposition. So it takes 3 to 6 hours, or more, to be digested in the intestines after taking it. The use of capsules in the production of drugs is mainly to protect the medicinal properties of the drug not to be destroyed, and at the same time also protect the respiratory tract and digestive organs.