Olmesartan — What It Does and How to Use It

Olmesartan is a blood pressure medicine from the ARB group (angiotensin II receptor blockers). It helps relax blood vessels so your heart can pump easier and your blood pressure drops. Most people take it once a day, and its effect lasts 24 hours, which makes it simple to fit into a routine.

How olmesartan works and common dosing

Doctors usually start adults on 20 mg once daily and may increase to 40 mg if blood pressure isn’t controlled. Some patients begin at 10 mg or a lower dose if they’re on a diuretic, elderly, or have low blood volume. Your doctor will adjust the dose based on your response and any side effects.

Check your blood pressure at home if you can. If your readings stay high after a few weeks, your doctor might raise the dose or add another medicine. Don’t change the dose on your own.

Side effects, warnings, and what to watch for

Common side effects include dizziness, headache, and tiredness. These often fade after a few days. Serious issues are less common but important: sudden swelling of the face or throat (angioedema), big rises in potassium (hyperkalemia), and kidney problems. There’s a rare but real condition linked to olmesartan called sprue-like enteropathy — long-lasting severe diarrhea and weight loss that can show up months after starting the drug. If that happens, stop the medication and call your doctor.

Don’t take olmesartan if you’re pregnant — it can harm the baby. If you’re breastfeeding, talk to your provider. Also tell your doctor about other drugs you use: NSAIDs (like ibuprofen) can reduce olmesartan’s effect and raise kidney risk; potassium supplements or potassium-sparing diuretics can push potassium too high; combining ARBs with ACE inhibitors raises the chance of kidney and potassium problems.

Your doctor will usually check your kidney function and potassium level within 1–2 weeks after starting or changing the dose, then periodically after that.

Want to buy olmesartan online? Always use a licensed pharmacy and never skip the prescription. Look for clear contact info, verified reviews, and secure payment. Avoid sites that sell prescription drugs without asking for a prescription or that offer prices that seem unrealistically low. If you’re ordering from another country, check shipping times and legal rules where you live.

If olmesartan sounds like it could help you, bring your blood pressure readings and a list of current medicines to your next appointment. That makes it easier for your doctor to pick the right dose and spot any risks. And if you notice swelling, severe diarrhea, fainting, or fast heartbeat, seek medical help right away.