Western medicines should not be taken after three months of expiration. If you take expired medication, the effect of the medication will definitely be greatly reduced and will not achieve the therapeutic effect. There is also the possibility of adverse reactions, including causing gastrointestinal symptoms or allergic reactions. If the drugs are not stored properly, there will also be mold and deterioration over time, and there is a possibility of chemical poisoning after taking expired drugs. Therefore, if the western medicine expired three months, absolutely can not be taken again. Drugs generally have a certain period of preservation and fixed preservation conditions, some oral solution nature of the drug, after opening the request in a short period of time to drink, so as to avoid the effect of the drug is affected or the occurrence of drug deterioration.