Can you take cetirizine together with piriton?

Increased sedation: Piriton is a brand name for chlorphenamine maleate aka Chlorpheniramine Maleate a classical antihistamine whose major adverse effect is drowsiness & prolonged reaction time. Other side-effects include constipation & in older men, urinary retention. Cetirizine (zyrtec) has the same side-effect profile. The combination will enhance these adverse effects. Take only with a physician's supervision.

Check it out: You can use a drug interaction checker whenever you have questions about drug-drug interactions or drug - food interactions. Here is 1 option (Drugs.Com): https://www.drugs.com/drug_interactions.php Your pharmacist is also a good source of info.