The main effects of Olopatadine Hydrochloride Tablets are antihistamine and anti-allergy. Clinically, Olopatadine Hydrochloride Tablets are used for the treatment of itching associated with allergic rhinitis, allergic conjunctivitis, dermatitis, eczema, urticaria, unusual dry ringworm and so on. Olopatadine Hydrochloride Tablets is an H1 receptor antagonist, inhibits the freeing and production of chemical transmitters such as leukotrienes, coagulant oxytetracycline, PAF and other chemical transmitters, which has an anti-allergic effect, and inhibits the freeing of neurotransmitter tachykinin. Adverse reactions such as dyspnea, tiredness, thirst, headache, dizziness, low concentration, abdominal discomfort, nausea, abdominal pain, constipation, hyperphagia and other adverse effects of Olopatadine Hydrochloride Tablets should be taken seriously. The occurrence of the above symptoms should be timely to the hospital for treatment, patients should follow the doctor’s instructions to take medication, not to adjust the dose or stop the drug, so as not to affect the therapeutic effect.