Levozin 2.5 MG Syrup is an antihistamine medicine used widely to relieve allergic symptoms like runny nose, sneezing, redness of the nose, watery eyes, itching, rash and hives. It stops the action of a natural substance called histamine produced in your body during an allergic reaction. Levozin 2.5 MG Syrup is generally safe to use. However, it may cause some side effects like drowsiness, dry mouth, headache, and tiredness. These symptoms are mild and go away with time