Yes, Viagra and lisinopril can generally be taken together, but the combination may lower blood pressure further.
Sildenafil (Viagra) and lisinopril both work by relaxing blood vessels — one to treat hypertension, the other to improve blood flow. That shared mechanism can make the pairing feel like a risky overlap, especially when you’ve heard warnings about mixing ED medications with blood pressure drugs.
The honest answer is that most men can take Viagra while on lisinopril, provided their blood pressure is well controlled and they are not on certain other medications. Still, the combination does require a moment of caution and a conversation with your doctor.
How the Combination Works
Lisinopril is an ACE inhibitor that lowers blood pressure by widening arteries. Sildenafil is a PDE5 inhibitor that increases blood flow to the penis, but it also produces a modest systemic effect on blood vessels.
In healthy men, a 100 mg dose of sildenafil can temporarily drop systolic pressure by 8 to 10 mm Hg and diastolic by 3 to 6 mm Hg. When you add that to lisinopril’s ongoing effect, the combined drop can be larger — though usually not dangerous for most people with controlled BP.
A 2001 study found that combining sildenafil with common antihypertensive drugs is “unlikely to cause clinically significant hypotension or an increased incidence of adverse events.” Still, the study is over two decades old, and individual responses vary.
Why Men Ask About This Combination
The question usually comes from two concerns: first, wondering whether ED treatments are safe when you already take BP meds, and second, worrying that mixing the two might cause a dangerous crash in pressure. Here’s what those worries break down into:
- Nitrate confusion: Many men with heart disease are on nitrates, which have a well-known dangerous interaction with Viagra. That warning sometimes gets mistakenly applied to all heart or BP drugs.
- ACE vs. alpha-blockers: Alpha-blockers (like doxazosin) can cause a large drop in pressure with Viagra. ACE inhibitors like lisinopril are much less risky — a key distinction many sources miss.
- BP drugs causing ED: Some antihypertensives can contribute to erectile problems, so men may want to check whether the treatment itself is compatible with ED medications.
- Fear of hypotension: Dizziness or lightheadedness from too-low pressure is the main realistic concern, and it can happen even without a formal interaction if your baseline BP is already on the low side.
- Need for doctor approval: Because every individual’s health picture differs — kidney function, other meds, heart health — most sources recommend checking with your prescriber before starting this combination.
The upshot is that lisinopril is among the safer BP meds to combine with Viagra, but it’s never a decision to make on your own.
What the Research Says About Viagra and Lisinopril
The most widely cited study on this pairing comes from 2001 and examined sildenafil with various antihypertensive drugs. It concluded that the combination did not raise the rate of adverse events above placebo. That finding is still the backbone of current guidance, though more recent large-scale trials are absent.
Consumer drug interaction databases typically classify lisinopril plus sildenafil as a “moderate” interaction. That label means monitoring for low BP symptoms is wise, but the combination is not automatically contraindicated. One useful resource is the Viagra lisinopril safety assessment, which walks through the risks and clarifies that while the combo may be appropriate for many patients, providers must assess individual factors.
| Medication Class | Interaction Risk with Viagra | Example |
|---|---|---|
| Nitrates (organic nitrates) | Contraindicated – profound hypotension possible within 24 hours | Nitroglycerin, isosorbide mononitrate |
| Alpha-blockers | Dangerous drop in BP – do not combine | Doxazosin, tamsulosin |
| ACE inhibitors | Moderate – additive effect, generally safe with monitoring | Lisinopril, ramipril |
| Calcium channel blockers | Moderate – additive effect possible | Amlodipine, nifedipine |
| Other PDE5 inhibitors | Low risk when not combined together, but avoid simultaneous use | Tadalafil (Cialis), vardenafil |
The table shows that lisinopril sits in a much safer category than nitrates or alpha-blockers. Still, every person responds differently, so taking the first dose in a setting where you can monitor how you feel is a practical step.
When to Use Extra Caution
Even if the combination is generally considered safe, certain situations raise the stakes. Work through these factors with your doctor before trying Viagra for the first time while on lisinopril:
- Check if you’re on a nitrate. If you take any form of nitrate — even a “PRN” nitroglycerin spray — you must not use sildenafil within 24 hours. This is a hard contraindication.
- Note your BP control. If your blood pressure runs on the low side already (below about 110/70) or is poorly controlled, the additive effect could tip you into symptomatic hypotension.
- Avoid alpha-blockers. Men taking alpha-blockers for prostate issues or hypertension should not combine them with Viagra. Lisonopril is fine, but check your full medication list.
- Start with a low dose. Many prescribers recommend beginning with 25 mg of sildenafil rather than 50 or 100 mg when taking an ACE inhibitor, to see how your body responds.
- Watch for symptoms. Dizziness, lightheadedness, headache, or fainting are signs the combo is dropping your pressure too far. If they happen, sit down and call your doctor.
These precautions don’t mean the combination is dangerous for everyone — just that a little forethought can prevent an unpleasant experience.
Key Safety Guidelines to Follow
The best data on this interaction comes from a 2001 trial published in PubMed, which enrolled men taking various antihypertensives and gave them sildenafil or placebo. The sildenafil antihypertensive interaction study reported no increase in adverse events and no clinically significant change in how the body handled the drugs. However, the trial was relatively small, and real-world use can be less predictable.
What the study can’t capture is how an individual’s kidney function, age, or other medications may change the outcome. That’s why practical guidelines emphasize communication with your prescriber and cautious self-monitoring.
| Low BP Symptom | What to Do |
|---|---|
| Dizziness when standing up | Stand slowly; if persistent, talk to your doctor |
| Lightheadedness | Sit or lie down until it passes; consider a lower sildenafil dose next time |
| Fatigue or unusual weakness | Check your BP reading; avoid driving if you feel faint |
Symptoms usually resolve quickly on their own once the sildenafil wears off (about 4 hours). If they continue longer or are severe, contact your provider.
The Bottom Line
Viagra and lisinopril can safely be taken together for most men whose blood pressure is controlled and who are not on nitrates or alpha-blockers. The key is to start with a low dose, watch for dizziness, and confirm with your prescribing doctor that this combination fits your specific health picture.
Your cardiologist or primary care doctor knows your BP history, kidney function, and other medications — a quick check-up can give you the confidence to proceed without guessing.
References & Sources
- Nmi. “Viagra and Lisinopril Can They Be Taken Together Safely” While the combination of Viagra and lisinopril may be appropriate for some patients, it is not a universally safe option; providers must assess individual patient risk.
- PubMed. “Sildenafil Antihypertensive Interaction Study” A 2001 study published in PubMed found that the combination of sildenafil (Viagra) and antihypertensive drugs is “unlikely to cause clinically significant hypotension.