Similasan's line of products are prepared by trained homeopaths with extensive experience and practice. Similasan Eye Drops are tolerated well even by the most sensitive individual. Many U.S. eyecare professionals recommend the drops and offer samples to patients. Similasan eye drops stimulate the healing process without the pharmacological action of standard medications. Some of the currently available eye drops constrict the eye's blood vessels, which can make your eyes increasingly red and irritable, a condition known as rebound. Some contain toxic ingredients and can trigger drug interactions and cause unexpected side effects. In extreme cases, chronic use of these OTC drops can mask serious diseases such as glaucoma. Similasan's unique "Active Response Formula" quickly stimulates the eye's natural ability to stop itching, burning and watering from allergies. No sting, side effects or contra-indications. The "Active Response Formula" is immediately soothing-never stings and causes no rebound. The natural formula is gentle enough for children - strong enough for adults. According to homeopathic principles the ingredients of this medication give you temporary relief from symptoms of: Hay fever, allergic reactions of the eyes and eyelids, such as: Redness, itching and burning sensations, excessive tearing.