Losartan: What You Need to Know About This Blood Pressure Pill

Losartan is a medicine that helps lower high blood pressure. It belongs to a group called ARBs, which block a hormone that makes blood vessels tighten. When the vessels stay relaxed, the heart doesn’t have to work as hard, and blood pressure drops.

If your doctor prescribed losartan, they likely did it to treat hypertension, protect your kidneys if you have diabetes, or reduce the risk of stroke. It’s a daily pill, but you don't have to worry about complex dosing schedules.

How Losartan Works

Losartan blocks the angiotensin II receptor. Angiotensin II is a chemical that tells blood vessels to narrow. By stopping this signal, losartan lets the vessels stay open. The result is smoother blood flow and lower pressure.

Because it works differently from other blood pressure drugs like ACE inhibitors, some people who can’t tolerate cough from ACE inhibitors do well on losartan. It also helps the kidneys filter blood better, which is why doctors often use it for patients with diabetes.

Tips for Safe Use

Take losartan at the same time each day, with or without food. If you miss a dose, take it as soon as you remember, but don’t double up. Keep a pillbox or set a reminder on your phone to stay consistent.

Drink plenty of water unless your doctor says otherwise. Skipping fluids can make the medication work harder on your kidneys. Also, avoid salt-heavy meals because they can counteract the blood‑pressure‑lowering effect.

Common side effects are mild: dizziness, headache, or a slight increase in potassium levels. If you feel unusually weak, notice swelling in your ankles, or have a rapid heartbeat, call your doctor right away.

Before starting losartan, tell your doctor about any other medicines you take. Certain drugs, like NSAIDs or potassium supplements, can interact and raise potassium too much. Your doctor may check blood work after a few weeks to make sure everything is okay.

Pregnant women should not use losartan because it can harm the baby. If you become pregnant while on the drug, let your doctor know immediately so they can switch you to a safer option.

Store losartan at room temperature away from heat and moisture. Keep it out of reach of children. If a dose looks discolored or broken, discard it and ask your pharmacy for a new one.

Managing blood pressure isn’t just about pills. Pair losartan with regular exercise, a balanced diet, and limited alcohol. Even a short walk most days can boost the medication’s effect.

If you’re unsure about any aspect of losartan—dose, side effects, or interactions—don’t hesitate to ask your pharmacist or doctor. A quick chat can clear up confusion and keep you on track for a healthier heart.