Afrin Allergy Sinus 12-Hour Nasal Decongestant Spray reduces swelling of nasal passages to provide fast, powerful, medicated nasal and sinus congestion relief. Delivering a mist of relief, this medicated sinus and allergy nasal spray starts working instantly, alleviating nasal congestion from the common cold, hay fever and other upper respiratory allergies. Just two or three quick and firm sprays in each nostril provide 12 hours of nasal congestion relief for adults and children 6 to 12 years with adult supervision.