The main drug ingredient of Centamin Drops is the antihistamine drug cetirizine hydrochloride, which is mostly used in adults and children for rhinitis or allergies due to hives, as a selective histamine H1 receptor antagonist, it mainly antagonizes seasonal and perennial allergic rhinitis, as well as hives or itchy skin symptoms due to allergies. However, there are significant side effects, including drowsiness, dizziness, vertigo, and dry mouth, among other adverse conditions, so when taking the drug, it needs to be contraindicated or used with caution in younger children and professionals doing delicate work.