The medicine has expired and can't be taken. On the one hand, it will reduce the effectiveness of drug treatment, on the other hand, it will also bring great risks to the safety of drug treatment. Some drugs will deteriorate after expiration, resulting in some serious side effects. Such as nausea, vomiting, abdominal pain, diarrhea, etc. In severe cases, it will lead to some serious diseases and aggravate the condition. Lead to life danger, etc.
First of all, the deterioration of drugs is a slow process, which is different for different drugs. However, drugs that have passed the shelf life, whether one day or half a year, can not guarantee whether they are invalid or deteriorated. This is because it has exceeded the period of data obtained from the manufacturer's stability test and long-term sample observation test.
At the same time, the speed of drug change is affected by drug composition, storage environment or whether it has been opened and used. In case of any problem with expired drugs, the manufacturer will no longer bear any responsibility. Generally speaking, expired drugs cannot be guaranteed in terms of quality, effectiveness and even law, so they are not recommended to be reused.