Chlorpheniramine refers to chlorpheniramine maleate, also known as paracetamol, which belongs to a generation of antihistamines. It is mainly used to treat a series of symptoms caused by allergic reactions, with long-lasting and better effects. When the organism has an allergic reaction, capillary dilatation usually occurs, and chlorpheniramine maleate can improve allergic symptoms by reducing capillary permeability. However, it has obvious central inhibitory effect, and adverse reactions such as dizziness, fatigue and drowsiness may occur during administration. Therefore, it is not recommended to drive, or engage in dangerous or delicate work that requires delicate operation during the period of taking the drug, so as to avoid irreparable harm. Chlorpheniramine maleate belongs to the first generation of antihistamines, not only will the above adverse reactions occur, but also the therapeutic effect is not as good as the second and third generation of antihistamines, it is recommended that when the therapeutic effect is not good, timely follow the doctor’s advice to change to other drugs. In addition, no matter what kind of drugs are used, it is recommended to go to the hospital for examination and use the drugs under the guidance of professional doctors after a clear diagnosis. Avoid blindly using drugs to avoid other adverse reactions.