Cold and flu medicines should not be taken indiscriminately. If the symptoms of a cold are mild, you don’t need medication, just rest and drink plenty of water. If the symptoms are severe, symptomatic treatment is the main, different cold symptoms, the drugs taken are different. If you have nasal congestion, nasal mucosal congestion and other symptoms, you can follow the doctor’s instructions to apply decongestant drugs such as pseudoephedrine hydrochloride, so as to reduce nasal congestion, relieve nasal congestion, runny nose and other symptoms. For patients with frequent sneezing and runny nose, antihistamines such as chlorpheniramine maleate, loratadine, cetirizine, etc. can be used as prescribed by the doctor. If headache, fever, generalized muscle pain and other symptoms, can be prescribed to use antipyretic and analgesic drugs, such as acetaminophen. If cough is severe, cough suppressants such as codeine and dextromethorphan may be prescribed. If cough and phlegm are present, expectorants such as ambroxol and bromhexine may be prescribed. In case of influenza, antiviral drugs such as oseltamivir can be taken. After a cold, you need to consult a doctor, follow the doctor’s instructions, do not take medication without authorization or unauthorized changes in the dosage of drugs to avoid adverse drug reactions, or can not achieve the purpose of curing the disease and lead to a delay in the condition of the disease.