Precautions are for the characteristics of different drugs, special groups of people, to draw the user’s special attention, such as certain special groups of people (such as infants, pregnant women, athletes, drivers, etc.) should avoid the use, special periods (such as when a cold and fever) should stop using, as well as dietary attention, before and after meals, the requirements of taking water temperature, etc., in order to maximize the safety of consumers with drugs. Specially remind pregnant women to pay attention and try not to use the medicine during pregnancy. Cao Wenlan, Department of Oncology, Xiyuan Hospital, Chinese Academy of Traditional Chinese Medicine, production date and expiration date: “production date” refers to the date when a certain drug has completed all production processes, expressed in numbers, the first four representing the year of production, the middle two representing the month, the last two representing the day, such as 19961002 that is, produced on October 2, 1993. For example, 19961002 is produced on October 2, 1993. The date of manufacture is linked to the expiration date, each drug will be clearly marked expiration date, generally 12 months, 24 months, etc., varying from drug to drug. For example, the expiration date of the above drug is three years, that is, the drug can only be used until October 2, 1999, the expiration date is invalid. Expired drugs must not be used again, otherwise it will not only delay the disease, but also cause other adverse reactions. The expiration date of the drug is a prerequisite to ensure the quality and safety of drugs, so consumers must check carefully when buying drugs. Drug batch number that the production unit in the drug production process, the same feeding, the same production process produced by the drug, with the same batch number to indicate. The batch number indicates the production date and batch, the batch number can be deduced from the expiration date of the drug and the length of storage time, while facilitating the sampling and inspection of drugs. In the production process, the drug batch number mainly plays the role of identification. It is generated at the stage of drug production planning, and can be increased with the production process, while forming the production records corresponding to it. According to the production batch number and the corresponding production records, the batch of products can be traced back to the source of raw materials (such as raw material batch number, manufacturer, etc.), the history of the drug formation process (such as tablet granulation, tablet pressing, dispensing, etc.), and after the formation of finished products, according to the sales records, the market destination of the drug and the quality of the drug after entering the market can be traced, and the batch of drugs can be controlled or recalled when needed. For the drug supervision manager, drug quality supervision and drug control can be carried out based on the sampling and testing of the batch of drugs and the situation that occurs in use. In the use of drugs, they all involve drug lot numbers as well. In the treatment of some diseases, doctors recommend that patients should use the same batch of drugs to achieve consistency in drug quality. In addition, the lot number of some drugs is very important for the safety of drug use, such as sodium penicillin for injection, if you change the lot number, you need to do a new skin test, otherwise there is a risk of causing allergies, so it is recommended that you must purchase drugs under the guidance of a physician, especially antimicrobials and prescription drugs, must not be purchased at will. OTC and prescription drug classification management is based on the principle of safe and effective drugs, easy to use, according to its variety, specifications, indications and different routes of administration, the drugs are managed according to prescription drugs and “OTC”. This classification has strict regulations, management system and into the supervision and management. “Prescription drugs” are prescribed by the national drug supervision and management department as drugs with large pharmacological effects, treating serious diseases and prone to adverse reactions, and can only be used by patients under the guidance of doctors. Prescription drugs are the main body of drugs that doctors use in clinical practice to help patients with their illnesses. Therefore, the doctor who prescribes such drugs must have the professional qualification of a physician, and the patient must buy and use them under the supervision and guidance of a doctor. “OTC”, that is, over-the-counter drugs, mainly include cold and flu medicines, cough medicines, analgesics, digestive aids, anti-gastric acid medicines, vitamins, deworming medicines, tonic medicines, laxatives, topical medicines, contraceptives, skin care medicines, etc. The drugs listed as non-prescription drugs have generally been thoroughly examined for a longer period of time and have many advantages as follows: precise efficacy, less toxic side effects, ease of use, easy storage, etc. They are drugs that facilitate consumers’ self-care and are used for quick and effective relief of minor illnesses without a doctor’s prescription and can be purchased and used at their own judgment and choice. Patients should carefully read the indications and contraindications of the drugs to ensure that they are used correctly, and should choose a manufacturer with formal qualifications and pay attention to the shelf life of the drugs and the appearance of the packaging to identify the authenticity of the drugs to ensure the quality of the drugs.