The typical recommended dosage of Zyrtec (cetirizine) for adults and children aged 6 years and older is 10 mg once daily. It is important not to exceed this dosage within 24 hours to avoid increased risk of side effects. For children aged 2 to under 6, the dose is usually lower, such as 2.5 mg once daily with a possible increase up to 5 mg daily under medical guidance. For adults over 65 or people with kidney or liver issues, a lower dose may be advised by a healthcare provider. Zyrtec-D, which contains a decongestant, has a different dosing schedule—1 tablet every 12 hours, with a maximum of 2 tablets in 24 hours. Always follow the product label or a healthcare provider’s instructions, and do not take more than the recommended amount in one day. If symptoms persist or if an overdose is suspected, seek medical advice promptly.
