Cetirizine hydrochloride is given orally at 10 mg per day or 5 mg twice a day for adults and children 6 years and older. There was no additional benefit seen in increasing dose of Cetirizine hydrochloride to 20 mg.
In children 2 to 5 years, Cetirizine hydrochloride may be given at 5 mg per day given as one dose or 2.5 mg twice a day given every after twelve hours.
For children ages 6 months to 2 years with perennial allergic rhinitis and chronic urticaria, the initial dose is 2.5 mg per day. This may be increased to a maximum of 5 mg per day given two times per day.
Or as prescribed by the physician.
For patients with hepatic and renal impairment, the dose should be reduced to half their usual dose per day.
In managing seasonal rhinitis, it is recommended that Cetirizine hydrochloride be given at the beginning of hay fever season when pollens are still few.
Cetirizine hydrochloride may be administered with or without food as it will not affect absorption of the drug.