Vardenafil and Spironolactone: Can They Be Taken Together?

Vardenafil and Spironolactone: Understanding the Interaction

Published: 4 November 2026

Many men wonder whether vardenafil and spironolactone can be taken together safely. The good news is that there is no absolute contraindication between these two medicines, but your prescriber will carefully assess your blood pressure and overall cardiovascular health before prescribing vardenafil. Spironolactone is a diuretic (water tablet) often used for high blood pressure or heart failure, and it can sometimes contribute to erectile dysfunction as a side effect, which is why some men seek ED treatment while taking it.

What Is Vardenafil and How Does It Work?

Vardenafil (generic Levitra) is a prescription medicine used to treat erectile dysfunction in men [5]. It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing the blood vessels in the penis, allowing more blood to flow in when you are sexually aroused. This helps you achieve and maintain an erection suitable for sexual activity.

Vardenafil is available in 5mg, 10mg, and 20mg tablets. You take it about 25 to 60 minutes before sexual activity, and its effects can last for several hours [5]. It only works when you are sexually stimulated—it will not cause an automatic erection. The usual starting dose is 10mg, but your prescriber may adjust this depending on how well it works and whether you experience any side effects.

Like all PDE5 inhibitors, vardenafil can lower blood pressure slightly. This is usually not a problem for most men, but it is important to tell your prescriber about all your current medicines and any heart or blood pressure conditions you have [5].

What Is Spironolactone and Why Is It Prescribed?

Spironolactone is a prescription medicine known as a potassium-sparing diuretic. It is commonly used to treat high blood pressure, heart failure, and fluid retention (oedema). It works by helping your kidneys remove excess salt and water from your body while keeping potassium levels stable. Spironolactone also blocks the effects of a hormone called aldosterone, which can contribute to high blood pressure and fluid build-up.

While spironolactone is effective for managing cardiovascular conditions, it can sometimes cause side effects that affect sexual function in men. These include reduced libido, erectile dysfunction, and breast tenderness or enlargement (gynaecomastia). These effects are related to spironolactone's anti-androgen properties—it can reduce the activity of male hormones like testosterone.

If you are experiencing erectile difficulties while taking spironolactone, it is important to discuss this with your GP. In some cases, adjusting the dose or switching to a different blood pressure medicine may help. However, many men continue spironolactone for important medical reasons and seek ED treatment to manage the sexual side effects.

Can Spironolactone Cause Erectile Dysfunction?

Yes, spironolactone is known to cause erectile dysfunction in some men. This is because it has anti-androgen effects, meaning it can interfere with the action of male sex hormones. Studies have shown that men taking spironolactone may experience reduced sexual desire, difficulty achieving or maintaining erections, and other sexual side effects. If you suspect your ED is related to spironolactone, do not stop taking it without medical advice, as it may be treating a serious condition. Instead, speak to your GP about your options, which may include ED treatment or an alternative medicine.

Vardenafil and Spironolactone: Is There an Interaction?

There is no major direct drug interaction between vardenafil and spironolactone that would make the combination unsafe or contraindicated. However, both medicines can affect blood pressure, so your prescriber will assess this carefully before prescribing vardenafil. Spironolactone is used to lower blood pressure, and vardenafil can also cause a mild reduction in blood pressure as a side effect [5].

When taken together, there is a theoretical risk that the blood pressure-lowering effects could add up, potentially causing dizziness, light-headedness, or fainting, especially when standing up quickly. This is usually manageable, and many men take both medicines without problems, but it is essential that your prescriber knows you are on spironolactone so they can choose the right starting dose of vardenafil and monitor you appropriately.

Your prescriber will also check your overall cardiovascular health, including your blood pressure readings, heart function, and any other medicines you take. If your blood pressure is well controlled and you have no other risk factors, vardenafil is likely to be a suitable option for you. Always be honest about all your current medicines during your consultation, including over-the-counter products and herbal supplements.

What Your Prescriber Will Check Before Prescribing Vardenafil and Spironolactone

Before prescribing vardenafil to someone taking spironolactone, your prescriber will carry out a thorough assessment. This includes checking your current blood pressure, reviewing your medical history, and asking about any symptoms such as dizziness or fainting. They will want to know why you are taking spironolactone, how long you have been on it, and whether your condition is stable.

Your prescriber will also ask about other medicines you take, especially those that can interact with vardenafil. These include nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, alpha-blockers (like tamsulosin or doxazosin), and medicines that affect liver enzymes (such as some antibiotics and antifungals) [5]. If you take any of these, your prescriber may adjust the dose of vardenafil or choose a different ED treatment.

They will also check that sexual activity is safe for you. If you have unstable angina, severe heart failure, very low blood pressure, or have had a recent heart attack or stroke, vardenafil may not be suitable [5]. Your prescriber may recommend seeing your GP or cardiologist for further assessment before starting ED treatment.

Starting Vardenafil While on Spironolactone

If you are taking spironolactone and your prescriber decides vardenafil is suitable, they will usually start you on the lowest effective dose—often 10mg. This allows them to see how you respond and minimises the risk of side effects such as dizziness or low blood pressure. You should take vardenafil as directed, about 25 to 60 minutes before sexual activity, and avoid taking it more than once a day [5]. If you experience any unusual symptoms, such as severe dizziness, chest pain, or an erection lasting more than four hours, seek medical help immediately.

Practical Advice for Taking Vardenafil and Spironolactone Together

If you are prescribed vardenafil while taking spironolactone, there are several practical steps you can take to use both medicines safely. First, take vardenafil exactly as prescribed—do not take more than one dose in 24 hours, and do not combine it with other ED medicines [5]. Take it on an empty stomach or after a light meal, as a heavy or high-fat meal can delay its effects.

Monitor your blood pressure if you have a home monitor, especially when you first start vardenafil. If you feel dizzy, light-headed, or faint, sit or lie down until the feeling passes. Avoid standing up too quickly, particularly after sitting or lying down for a while. Limit alcohol intake, as heavy drinking can worsen erectile dysfunction and add to the blood pressure-lowering effects of both medicines.

Do not stop or change the dose of spironolactone without medical advice, even if you think it is causing erectile difficulties. Spironolactone is often prescribed for important heart or blood pressure conditions, and stopping it suddenly could be harmful. If you have concerns about side effects, speak to your GP or prescriber—they may be able to adjust your treatment plan. Always keep your prescriber informed of any new medicines, including over-the-counter products, herbal remedies, and supplements.

When to Seek Medical Help and Warning Signs

While most men tolerate vardenafil and spironolactone together without serious problems, it is important to know the warning signs that require urgent medical attention. If you experience chest pain or discomfort during or after sexual activity, stop and seek immediate medical help—call 999 or go to A&E. Do not take nitrates (such as GTN spray) if you have used vardenafil in the past 24 hours, as this combination can cause a dangerous drop in blood pressure.

If you develop an erection that lasts longer than four hours (priapism), seek emergency medical help. Priapism is a medical emergency that can cause permanent damage to the penis if not treated promptly. Other warning signs include sudden loss of vision in one or both eyes, sudden decrease or loss of hearing (which may be accompanied by ringing in the ears or dizziness), or severe dizziness or fainting.

If you experience persistent side effects such as headache, flushing, indigestion, or nasal congestion, these are usually mild and may improve over time. However, if they are troublesome or do not go away, speak to your prescriber. They may adjust your dose or suggest a different ED treatment. Always attend follow-up appointments and keep your prescriber updated on how you are managing with both medicines.

Other Medicines to Mention During Your Consultation

In addition to spironolactone, make sure you tell your prescriber about all other medicines you take. This includes other blood pressure medicines (such as ACE inhibitors, beta-blockers, or calcium channel blockers), alpha-blockers (used for prostate symptoms), medicines for heart conditions, and any treatments for fungal infections or HIV. Some medicines can interact with vardenafil by raising its levels in the blood or increasing the risk of side effects [5]. Your prescriber will check every medicine during your consultation to ensure vardenafil is safe and appropriate for you.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 4 November 2026]
2. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 4 November 2026]
3. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 4 November 2026]
4. Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 4 November 2026]

Information on this page is for educational purposes only and is not medical advice. Prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting or changing any medication.