Knoll NS Nasal Drops contain Sodium chloride as an active ingredient. Knoll NS Nasal Drops is a decongestant spray and has properties that can relieve a blocked nose. They also have mild cooling effects that can soothe irritation in the lining of the nose. Knoll NS Nasal Drops help in shrinking the blood vessels present in the nose and relieve stuffy nose caused due to allergies, sinus infections, and the common cold.