Baijiahei is an anti-cold drug, also known as Aminophen Pseudoephedrine Tablets II, which is an over-the-counter drug with acetaminophen, pseudoephedrine and dextromethorphan hydrobromide anhydrous as the main ingredients. The main function of acetaminophen is to relieve fever and pain, while the main function of pseudoephedrine is to constrict the blood vessels of the nasal mucosa, thus relieving the symptoms of nasal congestion and sneezing. The main action of dextromethorphan hydrobromide anhydrous is to relieve the symptoms of coughing and coughing up sputum. This drug has two white tablets and one black tablet, of which the two white tablets are taken during the daytime, one in the morning and one at noon; there is one black tablet, and the black tablet is taken at night. Take care to drink more water, avoid getting cold, and eat more fresh vegetables and fruits.