Losartan and Olmesartan Dosing Equivalence

Guideline-Based Dosing Context

• The American College of Cardiology and American Heart Association guidelines list olmesartan's usual dose range as 20-40 mg once daily and losartan's range as 50-100 mg once or twice daily 1, 2
• For heart failure with reduced ejection fraction, the target dose of losartan is 100 mg once daily, representing the maximum therapeutic dose 3

Clinical Implications

• If switching from olmesartan 40 mg to losartan, start with losartan 100 mg once daily to maintain equivalent blood pressure control 3, 1
• Monitor blood pressure within 2-4 weeks after switching, as individual response may vary despite population-level equivalence 1

Important Caveats

• Both medications share the same contraindications: avoid in pregnancy, do not combine with ACE inhibitors, and monitor for hyperkalemia especially in patients with chronic kidney disease 1, 2, 3
• Losartan may be dosed once or twice daily (50 mg twice daily totaling 100 mg), which can provide more consistent 24-hour coverage in some patients 3