Trusted by generations of mums, Piriton provides fast relief from hayfever and other allergies. Piriton also relieves the itchy skin rash of chickenpox, and can be taken as syrup or tablets. Piriton is an antihistamine used to treat allergies. It relieve the itchiness, redness, swelling, tenderness and irritation associated with many skin problems. You can take Piriton for things like nettle rash, hives, heat rash, prickly heat, dermatitis, reactions to food, food additives or medicines, insect bites or stings.