What Cetirizine is and what it is used forCetirizine belongs to a group of drugs called antihistamines.These medicines help to relieve the symptoms of some allergies.This medicine is used to relieve: symptoms of hayfever and other allergies such as sneezing, runny nose and burning, itchy eyes symptoms of skin allergies such as rash, itching or urticaria (hives). What you need to know before you use CetirizineDo not use CetirizineDo not use this medicine if : You are allergic (hypersensitive) to cetirizine hydrochloride or any of the other ingredients of this medicine You have serious kidney problems You have lactose intolerance Other medicines and CetirizineCetirizine is not expected to interact with other medicinesTell your doctor or pharmacist if you are taking, have recently taken or might take any other medicinesPossible side effectsThe following side effects are rare or very rare, but you must stop taking the medicine and speak to your doctor straight away if you notice them:Allergic reactions, including severe reactions and angioedema (serious allergic reaction which causes swelling of the face or throat). These reactions may start soon after you first take the medicine, or it might start later.