Chlorphenamine (Mervilar) 4mg Tablet is an antihistamine (H1 receptor antagonist) used to relieve allergy symptoms such as sneezing, runny nose, itchy or watery eyes, and itching of the throat or nose. It is also effective in managing hay fever, urticaria (hives), and other allergic conditions. Each box contains 100 tablets for oral administration, as prescribed by a healthcare provider.