What is Allertec WZF and what it is used for. Allertec WZF is an antiallergic drug containing cetirizine for use in adults and children. aged 6 years and older: to relieve symptoms of the nose and eyes associated with seasonal and chronic allergic rhinitis (such as nasal congestion, runny nose, itchy nose, frequent sneezing, red eyes, watery eyes, itchy eyes); to relieve the symptoms of chronic idiopathic urticaria (long-term itchy blisters on the skin).