Vicks Sinex is a nasal decongestant spray. The active ingredient contained in the Sinex nasal spray is oxymetazoline, which acts to relieve blocked nasal passages. The recommended dosage is 2–3 sprays in each nostril every 10–12 hours, though users should check the packaging for the specific product purchased. Excessive use of this product could lead to a dependency on it whereby the nasal passages block without use of oxymetazoline again. Thus it is recommended that Sinex not be used for more than three days. Always read the leaflet before the use of medication.