TL;DR: Lisinopril is not a significant cause of erectile dysfunction. A large 18-year follow-up study of over 7,400 men found no statistically significant difference in ED risk between lisinopril, the thiazide diuretic chlorthalidone, and the calcium channel blocker amlodipine. As an ACE inhibitor, lisinopril works through a mechanism that does not typically interfere with erectile blood flow. The hypertension lisinopril treats is a far more established and likely cause of any erectile difficulty.
Lisinopril is one of the most commonly prescribed blood pressure medications in the world. Long-term, large-scale data on exactly this question — does lisinopril cause ED — now exists, and it gives a clearer answer than the vague reassurances found in most general advice on the topic.
What Lisinopril Does and Why It’s Prescribed
Lisinopril belongs to a class of drugs called ACE inhibitors — angiotensin-converting enzyme inhibitors. It works by blocking the conversion of angiotensin I into angiotensin II, a hormone responsible for constricting blood vessels and raising blood pressure. With angiotensin II production reduced, blood vessels relax, and blood pressure falls.
This mechanism is why lisinopril sits among the first-line treatments for hypertension, and why it is also widely used in heart failure and following heart attacks to improve long-term cardiovascular outcomes. It has been in clinical use for decades and is one of the most extensively studied medications in cardiovascular medicine.
The 18-Year Study That Directly Tested Lisinopril and ED
Most reassurances about a drug’s sexual side effects rest on small studies or general drug-class reasoning. Lisinopril is unusual in having genuinely robust, long-term, head-to-head data specifically addressing this question.
A post-trial analysis published in PMC followed participants from the Antihypertensive and Lipid-Lowering Treatment to Prevent Heart Attack Trial (ALLHAT) by linking their data to 18 years of Medicare claims. The erectile dysfunction outcome was assessed in 7,444 men who were free of ED at baseline, comparing those treated with lisinopril against those treated with chlorthalidone (a thiazide diuretic) and amlodipine (a calcium channel blocker).
The result: there were no statistically significant differences in the 18-year risk of erectile dysfunction among the three drugs based on adjusted hazard ratios. This is a substantial, real-world, long-duration comparison — not a short trial measuring symptoms over a few weeks, but nearly two decades of outcome data across thousands of men.
What makes this study particularly convincing is that it was sensitive enough to detect other genuine differences between the same three drugs. The same analysis found that lisinopril carried a significantly higher 18-year risk of angioedema than amlodipine or chlorthalidone, and a significantly lower risk of insomnia than amlodipine. The study clearly had the statistical power to identify real differences where they existed — and for erectile dysfunction specifically, it did not find one.
How ACE Inhibitors Like Lisinopril Affect the Body’s Erection Mechanism
The biological reasoning behind this neutral finding is consistent with what is understood about how erections work and what lisinopril actually does in the body.
Angiotensin II — the hormone lisinopril suppresses — is not a passive bystander in erectile physiology. It plays an active role in causing the penis to return to its flaccid state after arousal, and it contributes to endothelial dysfunction, the underlying process that narrows and stiffens blood vessels throughout the body. By reducing circulating angiotensin II, lisinopril removes a hormone that works against, rather than for, sustained erection.
There is a second relevant pathway. ACE inhibitors also slow the breakdown of bradykinin, a peptide that triggers nitric oxide release. Nitric oxide is the signalling molecule responsible for relaxing the smooth muscle in penile arteries, allowing the blood flow that produces an erection. More available bradykinin means, in principle, more support for this exact pathway.
None of this proves lisinopril actively improves erectile function in every patient. But it explains, mechanistically, why the large-scale outcome data shows no increased ED risk — the drug simply does not interfere with the processes erections depend on in the way some older blood pressure medications do.
Why Other Blood Pressure Drugs Carry More ED Risk Than Lisinopril
It is worth being honest here, because the picture is slightly more nuanced than a simple “older drugs are bad, newer drugs are fine” story.
Beta-blockers carry the most consistent and longest-documented association with erectile dysfunction among blood pressure medications, thought to relate to their effects on the central and peripheral nervous system pathways involved in arousal and erection. If you are taking lisinopril alongside a beta-blocker for combination blood pressure control, the beta-blocker is statistically the more likely contributor to any ED you experience.
Thiazide diuretics, including chlorthalidone, have also historically been associated with ED in some studies. Interestingly, the ALLHAT data described above found no significant difference between lisinopril and chlorthalidone specifically — which is a useful reminder that drug-class generalisations do not always hold up cleanly when tested directly against each other in large, long-term studies. The honest summary is that lisinopril performs at least as well as, and likely better than, several alternatives — but the differences between drug classes are not always as stark in rigorous data as general advice columns sometimes suggest.
Why Your Blood Pressure, Not Your Lisinopril, Is the Likely Cause
This is the point that matters most for how you interpret your own experience.
The NHS confirms that high blood pressure is itself a recognised physical cause of erectile dysfunction. Chronically elevated blood pressure damages the endothelium throughout the body — including the small arteries supplying the penis — causing the same vascular stiffening and reduced blood flow responsiveness that produces ED, entirely independently of whatever medication is later prescribed to treat it.
This creates a common misattribution. A man is diagnosed with hypertension, started on lisinopril, and notices erectile difficulty some months or years later. The natural conclusion is that the newest variable — the tablet — must be responsible. But hypertension frequently goes undiagnosed for years before it is picked up, quietly damaging blood vessels throughout that time. The erectile difficulty may well have been developing during the undiagnosed period, with the lisinopril simply marking the point the underlying condition was finally identified and treated.
What to Do If You Take Lisinopril and Have Erectile Dysfunction
Do not stop taking lisinopril without speaking to your GP first. The cardiovascular protection it provides — particularly if you have heart failure or have had a heart attack — is significant, and the evidence does not support the drug as the cause of your ED.
A proper assessment should review how well your blood pressure is actually controlled (poorly controlled hypertension, even while on treatment, continues to cause vascular damage), check your full medication list for other drugs more strongly linked to ED such as beta-blockers, and include testosterone and blood glucose or HbA1c to rule out other common contributors.
PDE5 inhibitors such as sildenafil and tadalafil are generally safe to use alongside lisinopril. Both can lower blood pressure to some degree, so a mild additive effect is possible, but this is rarely a significant clinical issue and is something your GP can advise on directly based on your individual blood pressure readings.
At The Private GP in Birmingham, a private GP consultation and private blood tests can review your blood pressure control and check the relevant hormonal and cardiovascular markers, with same-day results and no referral needed.
Frequently Asked Questions
Should I stop taking lisinopril if I think it’s causing ED?
No — not without speaking to your GP first. The strongest available evidence does not support lisinopril as a meaningful cause of ED, and stopping it removes important cardiovascular protection while leaving the more likely cause, your underlying blood pressure, unaddressed.
Can I take Viagra or Cialis with lisinopril?
Yes. PDE5 inhibitors including sildenafil and tadalafil are generally safe alongside lisinopril. Both can lower blood pressure slightly, so a mild additive effect is possible, but this is rarely clinically significant. Discuss your individual blood pressure readings with your GP.
Is lisinopril better than other blood pressure medications for erectile function?
The evidence suggests it performs at least as well as several common alternatives. An 18-year study found no significant ED difference between lisinopril, chlorthalidone, and amlodipine, while beta-blockers carry the most established association with ED among blood pressure drug classes.
Why did I notice ED right after starting lisinopril?
This is most likely a timing coincidence rather than cause and effect. Hypertension often goes undiagnosed for years before treatment begins, quietly damaging the blood vessels responsible for erectile function throughout that time. The ED may have been developing well before the lisinopril.
Should I switch from lisinopril to a different blood pressure medication for my ED?
This is rarely necessary given the evidence, but if other causes have been ruled out and ED persists, it is a reasonable conversation to have with your GP. Reviewing your full medication list for other drugs more strongly linked to ED, such as beta-blockers, is usually a more productive first step than switching the lisinopril itself.