Oily dermatitis is known as seborrheic dermatitis, and Olopatadine Hydrochloride Tablets can treat seborrheic dermatitis. Olopatadine Hydrochloride Tablets belongs to H1 receptor blocking drug, mainly used in the treatment of allergic rhinitis, eczema, dermatitis, urticaria, unusual psoriasis, itchy skin, exudative erythema multiforme and so on, which has strong antagonistic effect on tissue receptor H1. Some patients may experience adverse reactions such as dizziness, headache, itching, dyspnea, constipation, lymphocytopenia, elevated blood pressure, muscle pain, menstrual abnormalities, etc., when taking Olopatadine Hydrochloride Tablets, patients need to stop taking it immediately, it is prohibited to take it for those who have a history of allergic reaction to the ingredients of the drug, and it is used with caution in patients with renal hypoplasia and hepatic function impairment. It is recommended that patients under the guidance of a doctor, strictly comply with medical advice to use drugs, not blindly use drugs or unauthorized changes in drug dosage, in order to avoid drug interactions, causing adverse effects on the body.