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Losartan is a prescription angiotensin receptor blocker. It is used mainly for high blood pressure, and also for heart failure and some kidney disease.
What should I know about Losartan?
It is usually a long-term medicine. Do not stop it unless a doctor tells you to. Regular blood tests and blood pressure checks are needed.
What are the side effects?
Dizziness, tiredness, headache, stomach pain, nausea and swelling in the legs or feet can occur.
Who should check first?
Tell your doctor if you have had angioedema, liver problems or severe heart failure. Tell your doctor promptly if you become pregnant or plan pregnancy so treatment can be reviewed. It is not usually used in pregnancy or breastfeeding. Interactions include other blood pressure medicines, potassium supplements, salt substitutes, NSAIDs and lithium.
When should I get help?
Get urgent advice for a fast or irregular heartbeat, or yellow skin or eyes. Call your local emergency number (000 in Australia) for swelling of the throat or tongue, or trouble breathing.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency. Outside Australia, use your local emergency number.
Source: NHS: About losartan. General education does not replace individual medical advice. Updated November 2026.
Explore our health guides and medicine FAQs. Medicine availability and product instructions vary by country; follow the leaflet supplied with your medicine.