 <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]  may be split in half, because the directions depend on the product you take. Swallow the whole or split tablet without crushing or chewing. The dosage is based on your medical condition and response to treatment. Take this medication regularly to get the most benefit from it. To help you remember, take it at the same time(s) each day. Keep taking this medication even if you feel well. Most people with high blood pressure do not feel sick. Do not stop taking this medication without consulting your doctor. Some conditions may become worse when this drug is suddenly stopped. Your dose may need to be gradually decreased. For the treatment of high blood pressure, it may take a week before you get the full benefit of this drug. Tell your doctor if your condition does not get better or if it gets worse (for example, your blood pressure readings remain high or increase).The side effects of Calan SR Oral: Dizziness, slow heartbeat, constipation, nausea, headache, or tiredness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To lower your risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position. Remember that this medication has been prescribed because your doctor </s>