Some patients, based on self-perception of discomfort, or individual obvious signs, self-judgment is the “old problem”, then without thinking about the past use of a drug. So repeatedly choose a drug, will cause some disadvantages. Such as: 1, there may be repeated use of a drug for many times, and drug-related diseases. And the old problem relapse, the triggering factors are not the same, some clinical signs are not exactly the same, the original drug used is also difficult to treat the newly emerged complications signs. 2, repeated long-term use of a drug is very easy to produce resistance, so that the amount of a drug to increase, but the effect is not Trojan, but enhance the toxic side effects, resulting in the deterioration of the disease. Increase or decrease the dosage of drugs at will Some patients can not be on time and quantitative medication, the course of treatment does not distinguish between the length, forget to take, omit to take, the phenomenon of indiscriminate taking occurs. The reasons for this: some of the condition has slightly improved, discomfort is obviously reduced, do not want to use drugs; some are busy or other reasons, the inconvenience of using drugs and forget to take; some are eager to cure the disease, eager to achieve and take carelessly, use the dose arbitrarily increased, or in a short period of time, frequent replacement of species, this irregular use of drugs, especially antibiotics, easy to lead to drug-resistant strains of bacteria, dual infection, etc., so that the condition is complicated, bringing difficulties to treatment. It will complicate the condition and make the treatment difficult. Therefore, when using over-the-counter drugs, you should refer to the drug instructions and strictly control the dosage and treatment course to ensure the safety and effectiveness of the medication. Some patients do not have a clear self-diagnosis and feel that the symptoms of a certain disease are similar to others, so they imitate others’ medication, ignoring the fact that there are multiple diseases co-existing in one person and the possibility of multiple symptoms appearing at the same time for the same disease. For example, in common bacterial pneumonia, the common clinical manifestations are fever, cough, sputum, chest pain, increased white blood cell count, etc. According to different etiologies, it can be divided into streptococcal pneumonia, Staphylococcus aureus pneumonia, Pseudomonas aeruginosa pneumonia, etc. Depending on the causative organism, the nature of the symptoms and the degree of urgency, the drugs used are bound to be different. It should also be noted that the same drug will have different effects on different patients. Therefore, it is necessary to use over-the-counter drugs scientifically according to the disease and the individual in order to achieve the expected therapeutic effect. In fact, the use of multiple drugs without indications will definitely disturb the normal defense function of human body and cause the interaction between drugs and drugs, drugs and the body, which will increase the incidence of adverse reactions. Sometimes the complications will aggravate the disease, sometimes it will cover up the symptoms and delay the chance of accurate diagnosis and treatment of the disease. So don’t use the drugs that are available or not, and don’t use multiple drugs if you can use a single drug. Some people always buy more drugs for emergency use as a family backup for occasional use. Due to the lack of basic knowledge of drugs and the limitations of home preservation conditions, patients cannot store and keep drugs according to their characteristics, and some drugs are wasted due to moisture absorption, mold, and expiration. Therefore, family medication should not be kept for a long time and should not be kept in large quantities. In storage, we should take measures to avoid light, humidity, low temperature and airtightness according to the physical and chemical properties of the medication, and frequently check and replace them to ensure the quality of family medication. In order to improve self-care ability, we advocate the establishment of self-care medication record card, detailed records of health status, the development of the disease, the name of drugs used, dosage, and changes before and after the use of drugs, as their own health care file information, through this continuous comparison and analysis, sum up the lessons learned, for scientific and rational use of non-prescription drugs, to improve health quality will have important reference value.