 <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] in and are being switched from another niacin product to this product. Follow your doctor's instructions carefully. Do not stop taking this medicine unless instructed by your doctor. If you stop taking niacin, you may need to return to your original dose and gradually increase it again. Ask your doctor or pharmacist for instructions on restarting your dose if you have not taken your medication for several days. Use this medication regularly to get the most benefit from it. To help you remember, take it at the same time(s) each day. It is very important to continue to follow your doctor's advice about diet and exercise. If your condition lasts or gets worse, or if you think you may have a serious medical problem, get medical help right away.The side effects of Endur-Acin Oral: Flushing/warmth in the face and neck, headache, itching, burning, sweating, chills, or tingling may occur within 20 minutes to 4 hours of taking this medication. Flushing may last for a few hours. These effects should improve or go away as your body adjusts to the medication. Stomach upset, heartburn, nausea, vomiting, and diarrhea may also occur. If any of these effects last or get worse, tell </s>