Zyrtec (cetirizine) is typically taken once daily. For adults and children 6 years and older, the usual dose is one 10 mg tablet once every 24 hours. For children between 2 and 6 years, dosing is usually lower and can be given as syrup or chewables once or twice a day depending on the form and severity of symptoms, but the total should not exceed 10 mg in 24 hours. Zyrtec-D (with decongestant) can be taken every 12 hours but no more than twice a day. It is important not to exceed the recommended dose to avoid side effects. Taking more than one dose in 24 hours without medical advice is not recommended, although some doctors may prescribe twice daily dosing for severe cases of hives or swelling under the skin. Always follow label instructions or doctor’s advice for dosing frequency.
