Cetirizine tablets are mainly composed of cetirizine hydrochloride and have the appearance of white or off-white tablets. Cetirizine is an anti-allergy drug, belonging to the second generation of H1 antihistamines, and is a long-acting, selective oral potent anti-allergy drug. Its adverse reactions are mild and transient. The more common ones include drowsiness, drowsiness, dizziness, vertigo, agitation, dry mouth and gastrointestinal discomfort, etc. Mild elevation of aspartate aminotransferase may occasionally be seen. It is commonly used in clinical practice for seasonal variant rhinitis, also known as allergic rhinitis, commonly known as hay fever, and is effective in acute and chronic allergic reactions of the skin, eyes, and respiratory tract, and is commonly used in the treatment of allergic rhinitis, dermatitis, oculoconjunctivitis, asthma, and urticaria.