What are the side effects of losartan?
Last updated September 3, 2026.
The NHS common list: dizziness (worst early or standing fast - rise slowly, skip driving until it passes), tiredness, headache, tummy pain, nausea, and leg, ankle, or foot swelling. The famous non-side-effect: no dry cough - losartan is the ARB doctors pick precisely when an ACE inhibitor's cough becomes unbearable. Periodic blood tests watch potassium and kidney function, which is also why potassium-based salt substitutes are a caution. The rare memorize-it reaction: angioedema - sudden lip, tongue, face, or throat swelling - stop and call emergency services. Hard no in pregnancy - this family can harm a fetus, so that conversation is explicit for anyone who could become pregnant. Pymander is a free AI doctor, 24/7 by text, and can help you weigh a symptom.
What to do
- Stand up slowly at first: early dizziness is the norm.
- Keep the blood tests: potassium and kidney checks are routine.
- Avoid potassium salt substitutes: ask before switching.
- Possible pregnancy? Say so now: ARBs are off the table.
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