 <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] etracycline antibiotics, chloroquine), preventing them from being fully absorbed by your body. Talk with your doctor or pharmacist about how to schedule your medications to prevent this problem. If your doctor has directed you to use this medication daily, use it regularly to get the most benefit from it. To help you remember, take it at the same time(s) each day. Tell your doctor if your condition lasts or gets worse. If you are taking this medication for diarrhea, tell your doctor if your diarrhea lasts more than 2 days.The side effects of Bismuth Subsalicylate Oral: Side effects from this medication are rare. The most common side effects are darkening of the stools and/or tongue. These effects are harmless and will disappear when you stop the medication. If your doctor has directed you to use this medication, remember that 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. Vomiting/diarrhea that doesn't stop may result in dehydration. Contact your doctor promptly if you notice any symptoms of dehydration, such as unusual decreased urination, unusual dry mouth/thirst, fast heartbeat, or dizziness/lightheaded </s>