Telmisartan: What It Does, How to Use It, and Safety Tips

Telmisartan is a common blood pressure pill that many doctors choose because it works once a day and usually causes fewer coughs than older drugs. If you or someone you care for was prescribed telmisartan, this page explains what it does, how to take it, side effects to watch for, and simple safety tips to get the most benefit.

How telmisartan works and why it’s used

Telmisartan belongs to a class called angiotensin II receptor blockers (ARBs). It lowers blood pressure by blocking a hormone that tightens blood vessels. Wider vessels mean lower pressure and less strain on the heart. Doctors prescribe telmisartan for high blood pressure and sometimes to lower heart and kidney risks in people who are already at higher risk.

One advantage of telmisartan is its long action — most people take it once a day. That helps with consistent control and makes it easier to stick to treatment.

Practical dosing and common side effects

Typical starting doses are 20–40 mg once daily; doctors may raise it up to 80 mg if needed. Take it at the same time each day, with or without food. Don’t skip doses and don’t stop suddenly without talking to your provider.

Common side effects are mild: dizziness (especially when standing up), lightheadedness, and sometimes stomach upset. Less common but important issues include high potassium, low blood pressure, and kidney function changes. If you feel faint, have a very fast or irregular heartbeat, or notice swelling, call your doctor right away.

A crucial safety note: telmisartan should not be used during pregnancy. It can harm the baby. Women who can become pregnant should use effective birth control and tell their doctor if they plan to get pregnant.

Watch for drug interactions. Combining telmisartan with potassium supplements, salt substitutes that contain potassium, certain diuretics, NSAIDs (like ibuprofen), or lithium can cause problems. Your pharmacist or doctor can check for interactions when you start any new medicine.

If you buy medicine online, use a licensed pharmacy that asks for a prescription. Fake drugs can be ineffective or dangerous. Keep track of blood pressure at home if your doctor suggests it, and bring readings to follow-up visits.

Need to know more? Ask your clinician about why telmisartan was chosen for you, how it compares to other ARBs, and specific targets for your blood pressure. Small changes — taking meds on schedule, avoiding extra potassium, and checking in with your doctor — make a big difference in safety and results.