Alcon Naphcon A Eye Drop, formerly prescribed by doctors, are now available without a prescription. Alcon Naphcon A Eye Drop combine a redness reliever & an antihistamine for temporary relief of itchy, red eyes from allergies caused by ragweed, pollen, grass, & animal dander & hair. * A gentle, effective, thimerosal-free, preserved solution * Recommended for re-wetting lenses during wear *. 5 fl. oz. (15 m L) bottle Consult a doctor before use if you have heart disease, high blood pressure, trouble urinating, or narrow angle glaucoma.