Piriton allergy tablets acts as an antihistamine to keep you free from allergy symptoms it contains the active ingredient chlorphenamine which relieves the symptoms of allergies and itchy skin rashes effective allergy treatment these tablets are effective for hayfever dust mites and mould spore allergies nettle rashes and hives skin allergies and dermatitis prickly heat and heat rash allergic reactions to certain foods or food additives medicine reactions insect bites and stings itching caus