Olopatadine hydrochloride tablets are very commonly used in the clinic, and the main effect is to see the allergy. For allergic rhinitis, allergic pharyngolaryngitis, urticaria, eczema, rashes, unusual psoriasis, including exudative erythema multiforme, have good efficacy, the specific dosage of the drug needs to be based on the patient’s age or symptoms, the appropriate increase or decrease, the patient after the use of the drug must drink a lot of water, so as to promote the absorption and metabolism of the drug, to alleviate the patient’s clinical symptoms. This drug also has certain side effects, such as patients may appear after the use of drugs, liver and kidney function damage, sometimes may be drowsy, it is recommended to be careful with the use of drugs, or under the guidance of a doctor to use the drug, if there is an adverse reaction during the use of the drug, the patient needs to stop the drug in a timely manner, and at the same time go to the hospital for further consultation.