Syrups and oral liquids generally do not need to be kept dry with care. In the process of medication, such as commonly used oral liquid, syrup belongs to the liquid form of the drug, these do not need to be dry preservation, but after opening should not be left for too long, should be used within the specified number of days. Among the basic principles of preserving medicines, keeping them dry is a very important part. For example, commonly used tablets, extended-release tablets, granules, and dispersions, if not kept dry, will become moist or coagulate, affecting the efficacy of the medicine. For example, yeast tablets, sodium phenytoin, calcium chloride, and vitamin B₁ are prone to denaturation when wet. If the drug appears to be discolored, moldy, spoiled, or has a strange smell, do not use it. So do not need to dry storage is mainly liquid drugs, most solid drugs need to be dry storage, and some need to be protected from light, low-temperature storage, in the drug expiration date to use.