Lisinopril vs losartan equivalence
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Blood Pressure Lowering: Lisinopril vs Losartan Equivalence
Several studies have directly compared the blood pressure-lowering effects of lisinopril (an ACE inhibitor) and losartan (an angiotensin II receptor blocker). In both animal and human studies, lisinopril and losartan have shown similar effectiveness in reducing blood pressure over a 24-hour period, indicating equivalent antihypertensive efficacy in the short term 27. However, some studies in humans found that lisinopril may provide a slightly greater reduction in blood pressure and pulse pressure compared to losartan, especially when measured at home or with ambulatory monitoring, rather than in the clinic 13.
Duration and Consistency of Antihypertensive Effect
When evaluating the duration and consistency of blood pressure control, lisinopril demonstrated higher trough-to-peak ratios and morning-to-evening ratios compared to losartan, suggesting a more sustained antihypertensive effect throughout the day. However, both drugs showed similar smoothness indices, indicating comparable overall homogeneity in blood pressure reduction .
Effects on Heart and Kidney Outcomes
In patients with cardiomyopathy, both lisinopril and losartan led to similar improvements in heart function (ejection fraction) over one year, with no significant difference between the two drugs . For patients with proteinuric kidney disease, combining lisinopril with losartan or increasing the dose of losartan both resulted in greater reductions in blood pressure and proteinuria compared to standard-dose losartan alone. The combination therapy was slightly more effective in those with high baseline proteinuria, but higher-dose losartan was better tolerated .
Impact on Myocardial Perfusion and Insulin Sensitivity
Lisinopril, but not losartan, improved myocardial perfusion reserve in patients with hypertension and left ventricular hypertrophy, suggesting a potential advantage of ACE inhibitors in repairing coronary microvascular function . Additionally, lisinopril improved insulin sensitivity in non-diabetic hypertensive patients, whereas losartan did not show a significant effect on this parameter .
Side Effects: Cough Incidence
A notable difference between the two drugs is the risk of cough. Lisinopril is significantly more likely to cause cough compared to losartan, especially in patients with a history of ACE inhibitor-induced cough. The incidence of cough with losartan is similar to that of a diuretic and much lower than with lisinopril 89.
Mechanistic Differences
Both drugs lower blood pressure by interfering with the renin-angiotensin system, but they do so via different mechanisms. Lisinopril reduces angiotensin II formation and increases angiotensin-(1–7), while losartan blocks angiotensin II receptors and increases both angiotensin II and angiotensin-(1–7) levels. Both drugs increase cardiac ACE2 gene expression and activity, but their effects on other cardiac peptides and enzymes differ .
Conclusion
Lisinopril and losartan are generally equivalent in their ability to lower blood pressure, with some evidence suggesting lisinopril may provide a slightly more sustained effect and additional benefits for myocardial perfusion and insulin sensitivity. However, losartan is less likely to cause cough and may be better tolerated in some patients. The choice between these medications should consider individual patient characteristics, side effect profiles, and specific clinical goals.
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