Diphen allergy relief antihistamine by Medique. Use for relief of sneezing, itchy nose and throat and watery eyes caused by hay fever or other respiratory allergies. Each easy to swallow, film coated capsule contains 25mg Diphenhydramine HCI. Diphenhydramine tablets may cause drowsiness. Compare active ingredient in Diphen allergy relief to Benadryl. English/Spanish printed dispenser box contains 200 individually wrapped caplets.