According to homeopathic principles, the active ingredients in this product temporarily relieve minor eye symptoms: excessive watery (clear) discharge, sensation of grittiness, redness and burning. Formulated with natural active ingredients. Use as often as needed. No harsh vasoconstrictors. Benzalkonium chloride free. These statements are based upon traditional homeopathic principles. They have not been reviewed by the Food and Drug Administration. Active ingredients are manufactured according to homeopathic principals. Similasan works differently than most medicated products. Formulated with natural active ingredients and trusted for over 75 years in Switzerland, it gently stimulates your body's natural ability to temporarily relieve symptoms.