Olopatadine Hydrochloride Tablets and Levocetirizine Hydrochloride Tablets for Febrile Urticaria Which one is more effective is still inconclusive, and needs to be chosen according to the patient’s own situation. 1. Olopatadine Hydrochloride Tablets, the main ingredient of which is Olopatadine Hydrochloride, are suitable for allergic rhinitis, urticaria, itchy skin diseases and so on. Serious adverse reactions such as hepatic impairment and jaundice may occur, as well as palpitations, increased blood pressure, constipation, and numbness sensation in the limbs. It is contraindicated for those who are allergic to the active ingredients of this product. Caution should be exercised for those with severe hepatic or renal impairment. 2. The main ingredient of Levocetirizine Hydrochloride Tablets is Levocetirizine Hydrochloride, which is suitable for seasonal allergic rhinitis, chronic idiopathic urticaria and other allergic symptoms. Adverse reactions such as headache, drowsiness, dry mouth may occur, and rarely the adverse reaction of ST-segment level downshift in the electrocardiogram. It is contraindicated in people who are allergic to the active ingredients of the product, people with severe impairment of renal function, etc. Pregnant women as well as lactating women should take it with caution. Olopatadine Hydrochloride Tablets and Levocetirizine Hydrochloride Tablets are both available for the treatment of febrile urticaria, but the choice of which drug to use needs to be based on the specific circumstances, and if you can’t tolerate the adverse effects of a drug or are allergic to the ingredients, then you can use another drug. The above drugs need to be used under the supervision of a doctor.