 <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]  cold or flu, pain, nausea, headache, and muscle weakness may occur when this medication is used to relax muscles. Double vision, drooping or swollen eyelid, eye irritation, dry eyes, tearing, reduced blinking, and increased sensitivity to light may also occur. If any of these effects last or get worse, notify your doctor or pharmacist promptly. You may require protective eye drops/ointments, an eye patch, or other treatment. When this medication is used to prevent migraines, side effects such as headache, neck pain, and drooping eyelid may occur. When this medication is used for excessive sweating, side effects such as non-underarm sweating, respiratory infections such as cold or flu, headache, fever, neck or back pain, and anxiety may occur. When this medication is used for overactive bladder, side effects such as urinary tract infections, burning/painful urination, fever, or difficulty urinating may occur. If any of these effects last or get worse, notify your doctor or pharmacist promptly. 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. A very serious allergic reaction to this </s>