Losartan Dose Equivalent to Entresto 24/26 mg
There is no direct equivalent dose of losartan to Entresto 24/26 mg because Entresto is fundamentally a different and superior medication that combines neprilysin inhibition with ARB activity—something losartan alone cannot replicate.
Understanding the Valsartan Component
The 26 mg of valsartan in Entresto 24/26 mg is bioequivalent to approximately 40 mg of standard valsartan tablets 1. According to the FDA label, the valsartan in Entresto has enhanced bioavailability compared to other marketed formulations.
Losartan-to-Valsartan Dose Relationships
Based on comparative receptor blockade studies and clinical trials:
- Losartan 50 mg is roughly comparable to valsartan 80 mg in terms of angiotensin II receptor blockade 2, 3, 4
- Losartan 100 mg approximates valsartan 160 mg 4
Using this conversion:
- If Entresto 24/26 mg contains the equivalent of ~40 mg standard valsartan
- This would theoretically correspond to approximately losartan 25 mg once daily
Critical Clinical Considerations
However, this comparison is clinically misleading and potentially dangerous for several reasons:
1. Entresto is Not Just an ARB
The sacubitril component (24 mg in this formulation) provides neprilysin inhibition, which increases natriuretic peptides and provides additional cardiovascular benefits that losartan cannot deliver 1.
2. Dosing Context Matters
According to 2022 AHA/ACC/HFSA guidelines 5:
- Entresto 24/26 mg twice daily is the STARTING dose, not the therapeutic target
- Target dose is 97/103 mg twice daily
- The mean dose achieved in clinical trials was 182 mg sacubitril/193 mg valsartan total daily
- Losartan target dose for HFrEF is 50-150 mg once daily, with 129 mg being the mean achieved dose
3. Clinical Outcomes Are Dose-Dependent
Recent evidence shows that Entresto 24/26 mg is associated with significantly worse outcomes compared to higher doses:
- Higher mortality rates (29.63% vs 9.27% with 97/103 mg) 6
- Higher HF hospitalization rates (29.14% vs 16.10% with 97/103 mg) 6
4. Entresto vs ARB/ACEI Equivalency
When comparing Entresto to equivalent-dose ARBs, Entresto 97/103 mg = valsartan 160 mg twice daily shows no superiority 7. However, Entresto only demonstrates superiority when compared to sub-equivalent doses of ARBs/ACEIs.
Clinical Algorithm
If you're considering this comparison for heart failure:
- Do NOT substitute losartan for Entresto 24/26 mg as a therapeutic equivalent
- If starting Entresto, begin at 24/26 mg twice daily only if:
- Patient has significant hypotension risk
- Patient has renal impairment
- Patient is elderly or frail
- Uptitrate Entresto every 2-4 weeks to target dose of 97/103 mg twice daily 5
- If Entresto is not tolerated or available, use guideline-directed ARB therapy:
- Losartan: start 25-50 mg daily, target 50-150 mg daily
- Valsartan: start 20-40 mg twice daily, target 160 mg twice daily
If you're considering this for hypertension alone:
- Entresto is more effective than ARBs for blood pressure control 8, 9
- Standard losartan dosing (50-100 mg daily) would be appropriate for hypertension management
- However, Entresto is not typically first-line for uncomplicated hypertension
Key Pitfall to Avoid
Never assume that matching the valsartan component alone makes medications equivalent. The sacubitril component provides critical additional benefit, and the 24/26 mg dose of Entresto should be viewed as a starting point requiring uptitration, not a maintenance dose with a losartan equivalent.