Nazocalm XL nasal spray is used in treatment of Nasal congestion (blocked nose). Nasal congestion (blocked nose) caused by the common cold or flu, hay fever, and other allergies can be treated with Nozclam XL 0.1% Nasal Drops. It helps to clear nasal congestion and obstruction by shrinking blood vessels in the nose. Nozclam XL 0.1% Nasal Drops should be used according to your doctor's instructions. Because it only provides brief comfort, do not use it more frequently or for longer than advised. Normally, you should gently blow your nose before using it, close one nostril while applying the medicine to the other, and then sniff hard to ensure the medicine goes deep into the nose. Then do the same thing with the other nostril. It gives immediate relief and can persist for several hours. If you take this medicine too often or for too long, it may aggravate rather than relieve your symptoms.