Tavegil Can Be Used To Treat A Number Of Allergies Such As: Hay Fever Rhinitis Eczema Allergic Rashes Urticaria Allergies To Medicines Tavegil belongs to a class of medicines called antihistamines which block the effects of a chemical called histamine. By blocking the effects of histamine it helps reduce symptoms of allergies such as a runny nose, itching, & swelling.