Heart Failure and Erectile Dysfunction Explained

Heart Failure and Erectile Dysfunction: Understanding the Link and Safe Treatment Options

Published: 13 October 2026

Heart failure and erectile dysfunction (ED) are closely connected conditions that affect many men. Heart failure reduces blood flow throughout the body, including to the penis, making it harder to achieve or maintain an erection [1]. Additionally, some heart failure medications and the psychological impact of living with a chronic heart condition can contribute to ED. The good news is that many men with stable heart failure can safely use ED treatments after a thorough medical assessment [2].

Why heart failure and erectile dysfunction occur together

Heart failure occurs when the heart cannot pump blood efficiently around the body. This reduced circulation directly affects erectile function, because erections depend on a strong blood supply to the penis [1]. When blood flow is compromised, achieving a firm erection becomes more difficult.

The severity of heart failure influences the likelihood of ED. Men with more advanced heart failure (classified as New York Heart Association class III or IV) are more likely to experience erectile difficulties than those with milder disease [2]. The endothelial dysfunction—damage to the lining of blood vessels—that occurs in heart failure also affects the small blood vessels in the penis.

Beyond the physical effects, heart failure can cause fatigue, breathlessness, and anxiety about physical exertion, all of which can reduce sexual confidence and desire. Some medications used to manage heart failure, particularly certain beta-blockers and diuretics, may also contribute to erectile difficulties as a side effect [1].

Medications for heart failure that may affect erectile function

Several classes of heart failure medication can influence erectile function. Beta-blockers, commonly prescribed to slow the heart rate and reduce strain on the heart, are associated with ED in some men, though newer beta-blockers may have less impact [2]. Diuretics (water tablets) can sometimes contribute to ED, possibly through effects on blood flow or hormone levels.

Importantly, you should never stop or reduce your heart failure medication without medical advice, even if you suspect it is affecting your erections. Uncontrolled heart failure poses a far greater health risk than ED. If you believe your medication is contributing to erectile problems, speak to your GP or heart specialist—they may be able to adjust your treatment or explore alternative options [1].

Alpha-blockers, sometimes used alongside heart failure treatment for prostate symptoms, require special caution if you are considering ED medication. The combination of an alpha-blocker and a PDE5 inhibitor (such as sildenafil or tadalafil) can cause a significant drop in blood pressure [3][4]. Your prescriber will need to ensure you are stable on the alpha-blocker and start you on the lowest dose of ED treatment.

Nitrates and nicorandil: absolute contraindications

If you take nitrate medications—such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate—or nicorandil for angina, you must not use any PDE5 inhibitor ED treatment [3][4][5][6]. The combination can cause a dangerous, potentially life-threatening fall in blood pressure. This is an absolute contraindication with no exceptions. Always declare all your current medications during your consultation, and never use recreational drugs containing nitrites (poppers) alongside ED medication [2].

When is sexual activity and ED treatment safe with heart failure?

Sexual activity is a form of physical exertion, roughly equivalent to climbing two flights of stairs or a brisk walk. For men with stable, well-controlled heart failure who can manage everyday activities without significant breathlessness or chest discomfort, sexual activity is usually safe [2]. However, if your heart failure is severe or unstable, your doctor may advise that sexual activity is not currently advisable.

PDE5 inhibitors—the main class of oral ED medication, including sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra), and avanafil (Spedra)—can be used by many men with heart failure, provided certain conditions are met [3][4][5][6]. You must not be taking nitrates or nicorandil, your blood pressure must be stable, and your heart failure must be well controlled. Severe heart failure (NYHA class IV) is generally a contraindication to PDE5 inhibitors because sexual activity itself may be too strenuous [2].

A full medical assessment is essential. During your online consultation at Cured Pharmacy, a UK-registered prescriber will review your heart failure diagnosis, current medications, symptoms, and overall fitness. They will determine whether ED treatment is appropriate and, if so, which medication and dose are safest for you. Never use ED medication without a proper consultation, especially if you have a heart condition [1][2].

How heart failure and erectile dysfunction are assessed

If you have heart failure and are experiencing ED, your GP or cardiologist will want to understand both conditions in detail. They will ask about the severity of your heart failure symptoms, how much physical activity you can manage, and whether you experience chest pain, dizziness, or breathlessness during exertion [2]. This helps them assess whether sexual activity is safe for you.

Your doctor will review all your current medications, paying particular attention to nitrates, nicorandil, alpha-blockers, and any other drugs that might interact with ED treatments. They will check your blood pressure and may arrange blood tests to assess kidney function, liver function, and cardiovascular risk factors such as cholesterol and diabetes [1][2].

For the ED itself, your doctor will ask about the frequency and severity of erection problems, morning erections, libido, and any psychological factors. They may use a questionnaire such as the International Index of Erectile Function (IIEF-5) to measure the severity of ED. Understanding the full picture allows them to recommend the safest and most effective treatment approach [2].

Cardiac risk stratification

Doctors use a cardiac risk stratification approach to decide whether sexual activity and ED treatment are safe. Low-risk patients—those with stable, mild heart failure, no recent cardiac events, and good exercise tolerance—can usually proceed with ED treatment after assessment. Intermediate-risk patients may need further cardiac evaluation, such as an exercise test, before starting treatment. High-risk patients—those with severe or unstable heart failure, recent heart attack or stroke, or uncontrolled arrhythmias—should not use ED medication until their cardiac condition is stabilised [2].

Lifestyle measures to improve heart failure and erectile dysfunction

Lifestyle changes can improve both heart failure and erectile function. Stopping smoking is one of the most important steps: smoking damages blood vessels, worsens heart failure, and significantly increases the risk of ED [1]. Even if you have smoked for many years, stopping now will benefit your heart and sexual health.

Maintaining a healthy weight reduces strain on the heart and improves blood flow. A balanced diet low in salt (to help manage fluid retention in heart failure) and rich in fruits, vegetables, whole grains, and lean protein supports cardiovascular health [1]. Limiting alcohol is also important—heavy drinking can worsen heart failure and directly impair erectile function.

Regular physical activity, as advised by your doctor or cardiac rehabilitation team, strengthens the heart and improves circulation. Even moderate exercise, such as walking, can enhance erectile function and overall wellbeing [1]. Managing stress and anxiety through relaxation techniques, counselling, or support groups can also help, as psychological factors often play a role in ED, especially when living with a chronic condition like heart failure [2].

Treatment options for erectile dysfunction with heart failure

For men with stable heart failure who are not taking nitrates or nicorandil, PDE5 inhibitors are the first-line treatment for ED [2]. These medications—sildenafil, tadalafil, vardenafil, and avanafil—work by increasing blood flow to the penis when you are sexually aroused. They do not cause erections on their own; sexual stimulation is still needed [3][4][5][6].

Your prescriber will usually start you on the lowest effective dose and may adjust it based on your response and tolerability. Sildenafil (Viagra) is taken about one hour before sex and lasts around four to six hours [3]. Tadalafil (Cialis) can be taken on-demand (at least 30 minutes before sex, with effects lasting up to 36 hours) or as a low daily dose [4]. Vardenafil (Levitra) works in 25–60 minutes [5], and avanafil (Spedra) is the fastest-acting, often effective within 15–30 minutes [6].

If PDE5 inhibitors are not suitable or effective, other options include alprostadil—a medication that can be applied as a cream (Vitaros) or given as an injection (Caverject) directly into the penis [7]. Vacuum erection devices and penile implants are also available for men who cannot use medication. Your doctor or a specialist urology service can discuss these alternatives with you [2].

Starting treatment safely

When you request ED treatment through Cured Pharmacy, a UK-registered prescriber will review your full medical history, including your heart failure diagnosis, current medications, and recent symptoms. If treatment is appropriate, they will prescribe the safest option and dose for you. All our ED medications are dispensed by our GPhC-registered pharmacy and delivered discreetly to your door. You should always follow the prescriber's instructions, take the medication as directed, and report any side effects or concerns promptly [1][2].

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 13 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 13 October 2026]
3. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 13 October 2026]
4. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 13 October 2026]
5. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 13 October 2026]
6. Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 13 October 2026]
7. Joint Formulary Committee. (n.d.). Alprostadil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/alprostadil/ [accessed 13 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.

Available Treatments

Pricing Disclaimer: Prices on some pages may not be up to date — the live pricing table below and pricing shown during consultation are official current prices and take precedence over any other figures on the site.

Get Treatment in 3 Steps

1

Choose your treatment

Select from our recommended UK-licensed medications.

2

Answer quick questions

Select safe UK treatments. Quick answers.

3

Get it delivered fast

We will deliver direct to you as quickly as tomorrow.