Modern medical research has concluded that in daily life, taking the following three kinds of drugs should not drink hot water. 1, digestive class. Such as pepsin combination, trypsin, multi-enzyme tablets, yeast tablets, such as enzymes in such drugs is an active protein, through the heat that coagulation denaturation and loss of catalytic effect, can not achieve the purpose of helping digestion. 2, vitamin class. Vitamin C of vitamin class is a water-soluble preparation, unstable, through the heat is easy to reduce the destruction and loss of effectiveness. 3, cough syrup class. These syrups are compound preparations, and if they are taken with hot water, they dilute the syrup, reduce the viscosity and fail to form a protective “film”, which affects the treatment of cough as soon as possible.