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Angiotensin II receptor antagonist (ARB)

Losartan potassium

Brand names: Cozaar

Adult dose

Dose: Hypertension: 50mg OD (25mg if elderly/volume-depleted); max 100mg OD
Route: PO
Frequency: OD

Clinical pearls

  • Alternative to ACEi where cough/angioedema; HFrEF, type 2 diabetic nephropathy
  • Active metabolite via CYP2C9 — modest variability

Contraindications

  • Pregnancy
  • Bilateral renal artery stenosis
  • Severe hepatic impairment

Side effects

  • Hyperkalaemia
  • Renal impairment
  • Hypotension
  • Hyperuricaemia
  • Cough (much less common than ACEi)

Interactions

  • NSAIDs
  • Potassium-sparing diuretics
  • Lithium
  • Sacubitril/valsartan

Monitoring

  • U&E
  • BP

Reference: BNF; NICE NG136; ESC; https://bnf.nice.org.uk/drugs/losartan-potassium/. Verify against your local formulary and the latest BNF before prescribing.

Related

Curated clinical cross-links plus same-class fallbacks.