The main function of Olopatadine hydrochloride tablets is the main treatment of allergic rhinitis, urticaria, skin diseases, such as eczema, dermatitis itchy rash, pruritus, itching associated with common hepatic polymorphic exudative erythema, the usage is oral. Usually adults 5mg2 tablets once, twice a day, once in the morning and once in the evening, according to the age and symptoms, increase or decrease the dose as appropriate, the adverse reactions of this drug have the incidence of adverse reactions after taking this drug is 16%, mainly drowsiness, lethargy, dry mouth, abdominal pain. Precautions: I. Use this product with caution in patients with decreased renal function. Use with caution in patients with hepatic dysfunction. Due to the possibility of inducing drowsiness, patients need to be very careful when engaging in hazardous work with mechanical operations after taking this product.