Lisinopril duration of action
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Duration of Action of Lisinopril
Introduction to Lisinopril's Pharmacodynamics
Lisinopril is a long-acting angiotensin-converting enzyme (ACE) inhibitor used primarily for the treatment of hypertension and congestive heart failure. Unlike some other ACE inhibitors, lisinopril is not a prodrug and does not require metabolic activation to exert its effects .
Onset and Duration of Action
After oral administration, lisinopril begins to take effect within 1 to 2 hours, with peak effects occurring around 6 to 8 hours post-dose . The drug's effects are sustained for at least 24 hours, allowing for once-daily dosing . This prolonged duration of action is a significant advantage over shorter-acting ACE inhibitors like captopril, which often require multiple doses per day .
Pharmacokinetics and Elimination
Lisinopril is absorbed intact, with approximately 25-29% of the dose being bioavailable. It is not metabolized and is excreted unchanged in the urine . The elimination half-life of lisinopril is approximately 12.6 hours in normotensive individuals, but this can be prolonged in patients with renal impairment . Steady-state concentrations are typically achieved within 2 to 3 days of consistent dosing.
Comparative Efficacy and Duration
Studies comparing lisinopril to other ACE inhibitors, such as captopril and enalapril, have demonstrated that lisinopril's longer duration of action provides comparable or superior efficacy in managing conditions like hypertension and heart failure . For instance, in patients with congestive heart failure, lisinopril administered once daily was found to be as effective as captopril administered three times daily in improving exercise duration and left ventricular ejection fraction .
Clinical Implications
The extended duration of action of lisinopril not only simplifies dosing regimens but also enhances patient compliance and overall treatment efficacy. This is particularly beneficial in chronic conditions requiring long-term management, such as hypertension and heart failure . Additionally, the drug's ability to maintain stable blood pressure control over 24 hours makes it a preferred choice for many clinicians .
Conclusion
Lisinopril's long duration of action, typically lasting at least 24 hours, allows for once-daily dosing, which is a significant advantage over shorter-acting ACE inhibitors. This extended effect, combined with its efficacy and safety profile, makes lisinopril a valuable option in the treatment of hypertension and heart failure.
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