 <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]  Take this medication by mouth with or without food as directed by your doctor, usually 4 times a day. The dosage is based on your medical condition and response to treatment. Your doctor may direct you to start taking this drug at a low dose and slowly increase your dose until you are taking the best dose for you. Your doctor will check your blood pressure and order lab tests (such as urine tests for catecholamines) to find the best dose. During treatment with this medication, it is important that you get plenty of fluids and pass urine often to help avoid kidney and bladder side effects. Ask your doctor how much fluid you should drink and how often you should urinate each day, and follow these instructions carefully. Use this medication regularly to get the most benefit from it. To help you remember, take it at the same times each day. Do not stop taking this medication without consulting your doctor. Keep taking this medication even if you feel well. Most people with high blood pressure do not feel sick. You may have trouble sleeping (insomnia) for 2 to 3 days after you stop taking this medication. Tell your doctor if these symptoms last or get worse or if you have other symptoms of very high blood pressure (such as headache, nausea, sweating, fast heartbeat). </s>