Huifenesin is effective in the treatment of cough. It is a compound preparation, which mainly contains ingredients including dextromethorphan, pseudoephedrine and paracetamol. It is mainly used for the treatment of common cold, influenza, and allergy-induced cough, nasal congestion, sneezing, sore throat and other symptoms relief. Some of these patients may experience adverse reactions after taking it, such as dizziness, weakness, palpitations, excitement, and even insomnia, nausea and vomiting, which can gradually disappear on their own after stopping the drug. This drug needs to be used with caution for patients with a lot of phlegm, athletes should also be used with caution, and it is prohibited for patients with allergic reactions.