In general, the family has the habit of storing commonly used drugs. Before using drugs, it is necessary to pay attention to the validity period on the drug box. However, improper storage, changes in the nature of drugs after opening and other factors may lead to the shortening of the validity period of drugs, or even the deterioration of drugs. In addition to expiration dates, the following tips can be used to determine if a drug has expired.

　　1, see: see whether the drug discoloration, applicable to all kinds of drugs. If the drug discoloration, or mildewy spots or spots, it means that the drug has deteriorated and failed; When the sugar coating tablet fails, the outer layer of sugar coating will often rupture, appear plaque or spots, but also occurs in autolysis, blackening or mildew; And the eye ointment and other ointments appear obvious drying, thinning, discoloration, water and oil separation, also indicates the deterioration of drugs.

　　2. Contact: as the capsule is easy to be affected by moisture, it is not suitable to take it if the shape is obviously softened, broken or leaking. Sugar coating tablets, granulates and other solid preparations should not be taken if they stick to each other.

　　3. Smell: for suppositories, tablets, soft capsules and other medicines, smell if there is any odor or odor. When syrup, granule and granule go bad, they often have peculiar smell, such as fermentative taste and bad smell. Soft capsules are often hard to tell from their color if they are spoiled, but if they smell oily, it's best not to take them.

　　4, shake: oral liquid, syrup, eye drops, suspension, nasal drops and other liquid preparations, before use shake, such as crystallization in the liquid, flocculent precipitate or see turbidity, can not be used again.

　　After the drug is opened, it is easy to be affected by external factors such as light, temperature, humidity, microorganisms and so on, and its properties change. Therefore, it should be used up as soon as possible after the drug is opened, and it should be discarded in time after the expiry date, and it cannot be used again. If long-term storage is required, the date of opening can be marked on the package so as to determine whether it has expired or not in the next use.

　　~ the family generally has the habit of storing commonly used drugs, and it is necessary to pay attention to the expiry date on the drug box before use. However, improper storage, changes in the nature of drugs after opening and other factors may lead to the shortening of the expiry date of drugs, or even the deterioration of drugs. At this time, the expiry date of drugs cannot be judged solely. In addition to expiration dates, the following tips can be used to determine if a drug has expired.

　　1, see: see whether the drug discoloration, applicable to all kinds of drugs. If the drug discoloration, or mildewy spots or spots, it means that the drug has deteriorated and failed; When the sugar coating tablet fails, the outer layer of sugar coating will often rupture, appear plaque or spots, but also occurs in autolysis, blackening or mildew; And the eye ointment and other ointments appear obvious drying, thinning, discoloration, water and oil separation, also indicates the deterioration of drugs.

　　2. Contact: as the capsule is easy to be affected by moisture, it is not suitable to take it if the shape is obviously softened, broken or leaking. Sugar coating tablets, granulates and other solid preparations should not be taken if they stick to each other.

　　3. Smell: for suppositories, tablets, soft capsules and other medicines, smell if there is any odor or odor. When syrup, granule and granule go bad, they often have peculiar smell, such as fermentative taste and bad smell. Soft capsules are often hard to tell from their color if they are spoiled, but if they smell oily, it's best not to take them.

　　4, shake: oral liquid, syrup, eye drops, suspension, nasal drops and other liquid preparations, before use shake, such as crystallization in the liquid, flocculent precipitate or see turbidity, can not be used again.

　　After the drug is opened, it is easy to be affected by external factors such as light, temperature, humidity, microorganisms and so on, and its properties change. Therefore, it should be used up as soon as possible after the drug is opened, and it should be discarded in time after the expiry date, and it cannot be used again. If long-term storage is required, the date of opening can be marked on the package so as to determine whether it has expired or not in the next use.