Cold remedies are mainly medicines used to treat the common cold or influenza, and most of them act as antipyretic, analgesic, anti-inflammatory or antiviral. There are many types of cold remedies, and different types of cold remedies have different effects and functions. For example, some cold remedies contain non-steroidal anti-inflammatory drugs (NSAIDs), which have antipyretic, analgesic and anti-inflammatory effects, and are used to relieve symptoms of colds, such as fever, headache, muscle pain, and arthralgia. There are also cold remedies that belong to the antiviral or antibacterial class of drugs, which can directly inhibit or kill viruses or germs in the body. In addition to this, there are also some proprietary Chinese medicines that can serve a similar purpose. Cold remedies are complex and diverse, and their adverse reactions, contraindications and precautions vary. Common adverse reactions include gastrointestinal reactions such as nausea, vomiting, epigastric discomfort or pain; allergic symptoms such as asthma and urticaria. Contraindications to use and their precautions depend on the specific drug. For patients who may need to take this medication, be sure to take it under the supervision of a doctor or pharmacist, and do not take it on your own.