Paracetamol is not a hormonal drug. The generic name of paracetamol is chlorpheniramine maleate, which is a histamine H1 receptor antagonist and an anti-allergic drug. It is used in the treatment of allergic rhinitis, urticaria, contact dermatitis and other diseases, and also relieves itching and edema caused by insect bites. Chlorpheniramine maleate, as a histamine H1 receptor antagonist, can counteract capillary dilatation caused by allergic reactions, reduce capillary permeability, relieve wheezing caused by bronchial smooth muscle contraction, antihistamine effect is more persistent, but also has obvious central inhibition, can increase the effect of anesthesia, analgesic, hypnotic and local anesthetic. Precautions for the use of chlorpheniramine maleate are: 1. It is forbidden for those who are allergic to chlorpheniramine maleate. 2. It is not suitable for newborns and premature infants, and should be used with caution by pregnant and lactating women. 3. Do not drive a car, boat or operate dangerous machines during the use of the drug. 4. Use with caution in patients with hyperthyroidism, glaucoma, peptic ulcer, hypertension. Adverse reactions include drowsiness, fatigue, fatigue, dryness of the mouth, nose and throat and other manifestations. Overdose of the drug can lead to difficulty in urination or pain in urination, dizziness, headache, nausea, abdominal pain, rash and other discomforts. Due to the obvious central inhibitory effect of chlorpheniramine maleate, it can cause drowsiness. During the use of the drug, it is not allowed to drive a car, boat or operate dangerous machines to avoid accidents. Patients should follow the doctor’s instructions to use the drug, not self-medication, after the use of the drug, if the above adverse reactions, you need to go to the hospital in a timely manner.