Afrin Severe Congestion Maximum Strength 12 Hour Nasal Decongestant Spray provides fast, powerful, medicated relief of severe sinus congestion and nasal congestion from colds or allergies. Formulated with menthol, this maximum strength nasal decongestant starts to work instantly. Just two quick, firm sprays in each nostril deliver measured doses of the medicine that provides severe nasal and sinus congestion relief.