Olopatadine hydrochloride tablets, is a kind of anti-allergy drugs, there is no maximum time to take, according to the changes in the condition, but if the symptoms can not be relieved after taking the medicine, you need to consult a doctor for diagnosis. Olopatadine hydrochloride tablets, mainly used for allergic rhinitis, urticaria, skin diseases with itching, etc., there is no clear time for specific medication, generally after the symptoms improve, need to continue to use the drug for about 3-5 days, for chronic diseases, may need to take a long time to use the drug, after the symptoms improve, gradually reduce the use of drugs. Olopatadine hydrochloride tablets, need to be taken under the guidance of a doctor, during the use of the drug can appear weakness, abdominal pain, erythema and other uncomfortable symptoms, need to immediately stop taking and timely medical attention. Renal insufficiency, liver dysfunction and other people, need to be careful to take. Allergic to this drug, pregnant and lactating women are prohibited.