Losartan
Losartan is a blood pressure medicine (ARB) found in 20 medicines sold in India, such as Losar 50, Repace 50, Losacar 50. Below: what it is for, how it works, how to take it, side effects, interactions and pregnancy advice.
What it is used for
Lowers blood pressure and protects the kidneys in diabetes.
How it works
An angiotensin receptor blocker (ARB) for high blood pressure, heart failure and diabetic kidney disease. It also lowers uric acid slightly.
How to take it
Usually 25 to 100 mg once a day.
Common side effects
- Dizziness, especially when standing up
- Tiredness
- Raised potassium
Get medical help straight away if
- Swelling of the face, lips or tongue
- Fainting
- Much less urine
- Muscle weakness or irregular heartbeat (high potassium)
Be careful
Not in pregnancy. Can raise potassium.
Other medicines and interactions
Potassium supplements, salt substitutes, spironolactone and NSAIDs raise potassium and kidney risk. Do not combine with an ACE inhibitor or aliskiren. Raises lithium levels.
Pregnancy and breastfeeding
Must not be used in pregnancy (it harms the baby's kidneys); switch before trying to conceive. Ask your doctor about breastfeeding; other medicines may be preferred.
Brands of Losartan (18)
Combination medicines that contain Losartan (2)
Common questions
What is Losartan used for?
Lowers blood pressure and protects the kidneys in diabetes.
How does Losartan work?
An angiotensin receptor blocker (ARB) for high blood pressure, heart failure and diabetic kidney disease. It also lowers uric acid slightly.
How should I take Losartan?
Usually 25 to 100 mg once a day.
What are the side effects of Losartan?
Common: Dizziness, especially when standing up, tiredness, raised potassium. Get help straight away for: Swelling of the face, lips or tongue, fainting, much less urine, muscle weakness or irregular heartbeat (high potassium).
Does Losartan interact with other medicines?
Potassium supplements, salt substitutes, spironolactone and NSAIDs raise potassium and kidney risk. Do not combine with an ACE inhibitor or aliskiren. Raises lithium levels.
Is Losartan safe in pregnancy and breastfeeding?
Must not be used in pregnancy (it harms the baby's kidneys); switch before trying to conceive. Ask your doctor about breastfeeding; other medicines may be preferred.
Does Losartan need a prescription in India?
Yes. In India it is a prescription (Schedule H) medicine, so a pharmacist should sell it only with a doctor's prescription.
Which brands contain Losartan?
Angizaar-50, Cosart-50, Covance 50, Cozaar 50, Losacar 25, Losacar 50, Losanorm-50, Losar 25, Losar 50, Losar-H, Losartas-50, Losium-50, Lostat 50, LTK-50, Omnitan 50, Repace 25, Repace 50, Repace-H, Revas 50, Tozaar 50.
Sources and further reading
- Losartan: NHS · MedlinePlus
NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.
Last reviewed 31 October 2026. Written by Satya Babu from standard prescribing information.
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