Vardenafil and Amiloride: Can They Be Taken Together?

Takes less than 2 minutes to complete 100% online

Vardenafil and Amiloride: Understanding the Interaction

Published: 27 October 2026

Vardenafil and amiloride can generally be taken together, but your prescriber will carefully assess your blood pressure and overall cardiovascular health before approving this combination. Vardenafil is a prescription medicine used to treat erectile dysfunction (ED), while amiloride is a potassium-sparing diuretic (water tablet) often prescribed for high blood pressure or fluid retention. Because both medicines can affect blood pressure, it's essential that a qualified healthcare professional reviews your full medical history and current medications to ensure the combination is safe for you.

What is vardenafil and how does it work?

Vardenafil (also known by the brand name Levitra) is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK to treat erectile dysfunction [5]. It works by relaxing the blood vessels in the penis, allowing increased blood flow when you are sexually aroused. This helps you achieve and maintain an erection suitable for sexual activity.

Vardenafil is available in 5 mg, 10 mg, and 20 mg tablets. The usual starting dose is 10 mg, taken about 25 to 60 minutes before sexual activity [5]. You should not take more than one dose in 24 hours. Vardenafil requires sexual stimulation to work—it does not cause an erection on its own.

Like all PDE5 inhibitors, vardenafil has a mild blood-pressure-lowering effect because it relaxes blood vessels throughout the body, not just in the penis [5]. This is why your prescriber needs to know about all your current medicines, especially those that also affect blood pressure.

What is amiloride and why is it prescribed?

Amiloride is a potassium-sparing diuretic, a type of medicine that helps your kidneys remove excess fluid from your body while retaining potassium. It is commonly prescribed to treat high blood pressure (hypertension) or fluid retention (oedema), often in combination with other diuretics such as hydrochlorothiazide or furosemide.

Unlike some other diuretics, amiloride does not cause your body to lose potassium, which is why it is often used alongside thiazide or loop diuretics that do deplete potassium. By reducing fluid volume in the blood vessels, amiloride helps to lower blood pressure and reduce the workload on the heart.

Because amiloride is a blood-pressure medicine, any additional treatment that also lowers blood pressure—including vardenafil—needs to be considered carefully. Your prescriber will want to ensure that the combined effect does not cause your blood pressure to drop too low, which could lead to dizziness, fainting, or falls.

Can you take vardenafil and amiloride together?

Yes, vardenafil and amiloride can usually be taken together, but only under the supervision of a prescriber who has reviewed your full medical history. There is no absolute contraindication between these two medicines, meaning they are not forbidden to be used at the same time. However, because both can lower blood pressure, there is a potential for an additive effect that may cause dizziness, light-headedness, or fainting, especially when you stand up quickly.

Your prescriber will check that your blood pressure is well controlled on amiloride and that you do not have any other risk factors that would make the combination unsuitable. They may advise starting vardenafil at a lower dose (such as 5 mg) to minimise the risk of a significant blood-pressure drop [5]. It is important to be honest about all your current medicines, including over-the-counter products and herbal supplements, during your consultation.

If you experience persistent dizziness, fainting, or feel unwell after taking vardenafil while on amiloride, contact your GP or pharmacist for advice. Do not stop taking amiloride without medical guidance, as this could affect your blood pressure control.

How the interaction works in plain English

Vardenafil relaxes the smooth muscle in blood vessel walls, which allows blood to flow more easily—not just to the penis, but throughout the body. This relaxation causes a modest drop in blood pressure. Amiloride, on the other hand, reduces blood pressure by helping your kidneys remove excess fluid, which decreases the volume of blood your heart has to pump.

When you take both medicines together, their blood-pressure-lowering effects can add up. For most people, this is manageable and does not cause problems, especially if your blood pressure is stable and you start on a low dose of vardenafil. However, if the combined effect is too strong, you may feel dizzy or light-headed, particularly when moving from sitting or lying down to standing. This is why your prescriber will assess your cardiovascular health and current blood pressure before approving the combination.

What your prescriber checks before approving vardenafil and amiloride

During your online consultation at Cured Pharmacy, the prescriber will ask detailed questions about your current health, medications, and medical history. They will want to know your current blood pressure readings, whether you have experienced dizziness or fainting, and whether your blood pressure is well controlled on amiloride.

The prescriber will also check for any other medicines you are taking that could interact with vardenafil. For example, if you are on an alpha-blocker (such as doxazosin or tamsulosin) in addition to amiloride, the risk of low blood pressure is higher, and extra caution is needed. They will also ask about any history of heart disease, stroke, or other cardiovascular conditions, as these can affect whether vardenafil is suitable for you [2].

If the prescriber approves vardenafil, they may recommend starting with the lowest effective dose and monitoring how you feel. They will advise you to avoid heavy alcohol, which can worsen both ED and low blood pressure, and to take vardenafil only as directed. If you have any concerns or side effects, you should contact the pharmacy or your GP promptly.

Practical advice for taking vardenafil with amiloride safely

If your prescriber has approved vardenafil while you are taking amiloride, follow these practical tips to use it safely. Take vardenafil about 25 to 60 minutes before you plan to have sex, and do not take more than one dose in 24 hours [5]. Swallow the tablet whole with water; you can take it with or without food, although a heavy, high-fat meal may delay how quickly it works.

Be mindful of how you feel when you stand up, especially in the first few hours after taking vardenafil. If you feel dizzy or light-headed, sit or lie down until the feeling passes. Avoid drinking large amounts of alcohol, as this can increase the risk of dizziness and make it harder to achieve an erection. Stay well hydrated, but do not suddenly change your fluid intake without discussing it with your doctor, as this can affect how amiloride works.

Continue taking amiloride exactly as prescribed by your doctor. Do not stop or adjust the dose on your own, even if you are starting vardenafil. If you experience any unusual symptoms—such as persistent dizziness, chest pain, or an erection lasting more than four hours—seek medical help immediately. Keep all your medicines in their original packaging and check the expiry dates regularly.

When to seek medical advice

Contact your GP or pharmacist if you experience repeated episodes of dizziness, fainting, or feel generally unwell after starting vardenafil. These symptoms may indicate that your blood pressure is dropping too low, and your prescriber may need to adjust your dose or review your treatment plan.

Seek urgent medical help (call 999 or go to A&E) if you develop chest pain during or after sex, if you have an erection that lasts more than four hours (priapism), or if you experience sudden loss of vision or hearing. These are rare but serious side effects that require immediate attention [5].

Other medicines and lifestyle factors to consider with vardenafil and amiloride

In addition to amiloride, your prescriber will ask about all other medicines you are taking. Never take vardenafil with nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites). Combining vardenafil with any of these can cause a dangerous drop in blood pressure [5]. Do not take vardenafil at the same time as another PDE5 inhibitor (such as sildenafil or tadalafil).

If you are taking other blood-pressure medicines in addition to amiloride—such as ACE inhibitors, angiotensin receptor blockers, beta-blockers, or calcium channel blockers—your prescriber will assess the overall effect on your blood pressure. Alpha-blockers (used for prostate symptoms or high blood pressure) require particular caution, and you should be stable on the alpha-blocker before starting vardenafil at a low dose [5].

Certain medicines that affect liver enzymes can alter how your body processes vardenafil. Potent CYP3A4 inhibitors (such as ritonavir, ketoconazole, itraconazole, or clarithromycin) can increase vardenafil levels, and vardenafil is often contraindicated or requires dose adjustment with these medicines [5]. Conversely, CYP3A4 inducers (such as rifampicin, carbamazepine, phenytoin, or St John's wort) can reduce vardenafil's effectiveness. Always declare every medicine, supplement, and herbal remedy during your consultation.

Lifestyle tips for better results

Erectile dysfunction is often linked to lifestyle factors and underlying health conditions such as diabetes, high cholesterol, or heart disease [1]. Making positive changes—such as eating a balanced diet, exercising regularly, maintaining a healthy weight, stopping smoking, and limiting alcohol—can improve both your cardiovascular health and your response to ED treatment.

If you have not seen your GP recently about your ED, consider booking an appointment. ED can be an early warning sign of heart disease or diabetes, and treating the underlying cause can improve your symptoms [2]. Your GP can also review all your medicines to ensure they are not contributing to ED and discuss whether any adjustments are needed.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 27 October 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 27 October 2026]
3. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 27 October 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.

Choose your treatment

Select from our recommended UK-licensed medications.

Answer quick questions

Select safe UK treatments. Quick answers.

Get it delivered fast

We will deliver direct to you as quickly as tomorrow.

Get Discreet ED Treatment Online

Start your journey to better health today.

• Reviewed by UK-based prescribers
• Takes under 3 minutes
• Discreet Packaging

Your Questions Answered