Homeopathic. Relieves congestion, soothes & moisturizes. Non habit-forming. Similasan's unique Active Response Formula medicine stimulates the body's natural ability to relieve congestion and inflammation of nasal passages while soothing dryness and irritation. The active ingredients in Sinus Relief nasal spray work effectively with no known side effects and no known drug interactions. Similasan nasal sprays are non habit-forming and will not cause reliance or the rebound effect. Similasan Healthy Relief products have provided safe, effective relief to millions of people for over 25 years. Active ingredients are microdiluted in accordance with the Homeopathic Pharmacopoeia of the United States, and are therefore non-toxic and have no known side effects. Made in Switzerland.