Isopto frin eye drops are used to reduce eye redness caused by constricted blood vessels and soothe irritation caused by allergies or exposure to environmental factors. They contain active ingredients that help constrict small blood vessels inside the eye, which reduces redness and provides a feeling of comfort. Isopto frin is used in cases such as allergic conjunctivitis or exposure to dust and wind. It is placed inside the eye after washing your hands well, avoiding touching the tip of the dropper to the eye to maintain the cleanliness of the solution. You must adhere to the dose specified by your doctor and not use the drops for long periods to avoid side effects.