It is best not to drink beer after taking cold medicine. Because many ingredients of cold medicine may cause mutually exclusive reactions with beer. It may cause loss of efficacy of the medicine in mild cases, may cause allergies and other phenomena, or endanger life in severe cases. Drinking alcohol can also cause some harm to people’s liver, and can also cause side effects to some extent, such as nausea, dry vomiting, loss of appetite, poor mental health, etc. This may be due to injury to the gastric mucosa. When serious effects occur, it may also cause cardiovascular diseases such as hypertension and hyperlipidemia. Therefore, patients are advised not to drink beer after taking cold medicine, and if they want to drink beer, they need to ask their doctors to prescribe medicines with herbal ingredients or medicines that cannot interact with beer. However, it is still recommended that patients drink less beer to benefit their health.