 <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]  angiotensin receptor blocker (ARB) and amlodipine is a calcium channel blocker. They both work by relaxing blood vessels so blood can flow more easily. Hydrochlorothiazide is called a "water pill" (diuretic) and causes your body to get rid of extra salt and water by making more urine. How to use OLMESARTAN-AMLODIPINE-HCTZ Read the Patient Information Leaflet if available from your pharmacist before you start taking this medication and each time you get a refill. If you have any questions, ask your doctor or pharmacist. Take this medication by mouth with or without food as directed by your doctor, usually once daily. If you take this drug too close to bedtime, you may need to wake up to urinate. It is best to take this medication at least 4 hours before your bedtime. 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 each day. Keep taking this medication even if you feel well. Most people with high blood pressure do not feel sick. It may take up to 2 weeks before you get the full benefit of this </s>