 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST] ation/redness of the eye, feeling as if something is in your eye, dry eyes, watering eyes, and increased sensitivity to light may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. This medication may slowly (over months to years) cause brown discoloration of the colored portion of the eye (iris). If you are using bimatoprost in only one eye, only that iris may change color. An increase in eyelash number/length/thickness, darkening of the eyelashes/eyelids, or eyelid changes may also occur in the treated eye. These changes may be permanent, but the long-term effects are uncertain. Notify your doctor if this occurs, and schedule regular eye exams to monitor it. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: vision changes, eye pain/swelling, swelling/redness of the eyelids. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice </s>