Hello. Piriton tablets contain the antihistamine chlorphenamine maleate, which is safe for use at age 6 years and up for histamine-triggered symptoms (e.g., nasal allergies, skin itching). At ages 6-11 years, the dose is usually one-half tablet by mouth every 4-6 hours up to maximum 6 doses in 24 hours. As it may be difficult for a child to swallow the solid half-tablet, a physician may indeed advise the caregiver to crush the dose before administering it.
If swallowing the half-tablet remains a problem, then the physician may consider the alternative of Piriton syrup. At ages 6-11 years, the syrup dose is 5 milliliters (1 measuring teaspoon).