The active ingredient in the medicine (the part that makes it work) is called cetirizine hydrochloride. This type of medication belongs to a family of medicines called ‘antihistamines‘. Cetirizine 10mg tablets are mainly used to relieve the symptoms associated with hay fever such as sneezing, runny/itchy nose and itchy/watery eyes. Cetirizine can also be used to deal with symptoms associated with skin rashes such as urticaria. This medication is suitable for children aged 6 and up and adults.