Dawa-CPM 4mg TabletsPiriton tablets are used to treat the allergic symptoms of hayfever and other allergies. The active ingredient is chlorphenamine maleate, an antihistamine which can help to relieve the symptoms of some allergies and itchy skin rashes. They can be used to treat the itchiness, redness, swelling, tenderness and irritation that can be caused by: hayfever and other allergies e. g. pet, house dust mite and mould spore allergies, nettle rash and hives, skin