Terfenadine tablets are H1-blockers, mainly used for the treatment of allergic rhinitis and urticaria. The oral administration of terfenadine tablets is mainly absorbed through the stomach and intestines, and its components are mainly concentrated in the liver, kidneys, salivary glands and spleen, while the cardiovascular and cerebrovascular concentrations are low, with a half-life of 20-25h, and most of them are finally excreted in the feces and urine. Adverse reactions include cardiovascular system, such as ventricular arrhythmia, ventricular tachycardia, ventricular fibrillation, cardiac arrest, hypotension, syncope, etc.; central nervous system, such as headache, dizziness, etc.; gastrointestinal system, such as abdominal discomfort, nausea, vomiting, etc.; other dry mouth, dry nose, dry throat, skin rash, allergy, etc.