Anaemia and Erectile Dysfunction: Causes & Treatment

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Anaemia and Erectile Dysfunction: Understanding the Link and Treatment Options

Published: 13 October 2026

Anaemia and erectile dysfunction are more closely connected than many men realise. Anaemia—a condition where your blood carries less oxygen than normal—can directly affect your ability to achieve or maintain an erection by reducing oxygen delivery to the tissues of the penis. Understanding this link is the first step toward addressing both conditions effectively.

How anaemia and erectile dysfunction are linked

Erections depend on a healthy blood supply carrying oxygen-rich blood to the penis. When you have anaemia, your red blood cells are either too few in number or don't contain enough haemoglobin—the protein that carries oxygen [1]. This means less oxygen reaches the smooth muscle and endothelial cells lining the blood vessels in the penis, which are essential for the relaxation and dilation needed for an erection.

Anaemia also causes fatigue, low energy, and reduced physical stamina, all of which can diminish sexual desire and performance [2]. Chronic anaemia may damage the delicate blood vessels throughout the body, including those in the penis, making erectile dysfunction more likely over time. Iron-deficiency anaemia is the most common type in the UK, but other forms—such as vitamin B12 or folate deficiency, and anaemia of chronic disease—can also contribute to erection problems.

If you have unexplained erectile dysfunction, it's important to see your GP for blood tests. Anaemia is often detected through a full blood count, and identifying the underlying cause allows for targeted treatment that may improve both your energy levels and your erectile function [1].

Symptoms and diagnosis of anaemia affecting erectile function

Common symptoms of anaemia include persistent tiredness, weakness, shortness of breath, pale skin, dizziness, and a rapid or irregular heartbeat [1]. Many men with anaemia also notice a drop in libido and difficulty achieving or maintaining erections. Because these symptoms can develop gradually, they are sometimes mistaken for stress or ageing.

Your GP will arrange a blood test to measure your haemoglobin level, red blood cell count, and other markers such as ferritin (iron stores), vitamin B12, and folate. A haemoglobin level below 130 g/L in men is generally considered anaemic, though the threshold can vary slightly [1]. Further tests may be needed to identify the cause—whether it's dietary deficiency, blood loss (for example, from the gut), or a chronic condition such as kidney disease or an inflammatory disorder.

If erectile dysfunction is one of your symptoms, your GP may also check your cardiovascular risk factors, blood glucose, and testosterone levels, as ED can be an early warning sign of heart disease or diabetes [2]. Addressing anaemia early not only improves your overall health but may also restore normal erectile function, especially if the anaemia was the primary cause.

When to seek medical advice

See your GP promptly if you experience persistent fatigue alongside erectile dysfunction, especially if you also have shortness of breath, chest pain, or notice blood in your stools or urine. These symptoms may indicate significant anaemia or an underlying condition that requires urgent investigation [1]. Early diagnosis and treatment can prevent complications and improve your quality of life, including your sexual health.

Treating anaemia to improve erectile dysfunction

The treatment for anaemia depends on its cause. Iron-deficiency anaemia is usually treated with oral iron supplements (such as ferrous sulphate or ferrous fumarate), which can take several months to restore normal iron levels [1]. Your GP will monitor your blood count and may investigate the source of any blood loss. Vitamin B12 or folate deficiency is treated with supplements or, in some cases, injections.

Many men notice an improvement in their erectile function once their haemoglobin levels return to normal and their energy and stamina increase [2]. However, if anaemia has been long-standing, some vascular damage may persist, and erectile dysfunction may not fully resolve with anaemia treatment alone. In these cases, ED medications can be very effective.

It's also important to address any underlying conditions contributing to anaemia, such as coeliac disease, inflammatory bowel disease, or chronic kidney disease. Your GP or specialist will guide you through the appropriate investigations and treatments. Eating a balanced diet rich in iron (red meat, beans, fortified cereals), vitamin B12 (meat, fish, dairy), and folate (green leafy vegetables, pulses) supports your recovery and helps prevent recurrence [1].

Lifestyle measures to support recovery

Alongside medical treatment, lifestyle changes can help. Avoid drinking tea or coffee with meals, as tannins can reduce iron absorption. Vitamin C-rich foods (citrus fruits, peppers, tomatoes) enhance iron uptake from plant sources. Regular, moderate exercise improves cardiovascular health and can boost energy levels, though you should avoid overexertion if you're severely anaemic. Reducing alcohol and stopping smoking also support vascular health and erectile function [2].

Oral ED treatments for men with anaemia

If erectile dysfunction persists despite treating your anaemia, oral ED medications—known as PDE5 inhibitors—are usually safe and effective [2]. These medicines work by increasing blood flow to the penis when you are sexually aroused. They do not cure ED, but they can help you achieve and maintain an erection sufficient for sexual activity.

The main PDE5 inhibitors available in the UK are sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra), and avanafil (Spedra) [3][4][5][6]. Sildenafil is taken about one hour before sex and lasts around four to six hours. Tadalafil can be taken on-demand (effect lasts up to 36 hours) or as a lower daily dose. Vardenafil works within 25–60 minutes, and avanafil is the fastest-acting, often effective within 15–30 minutes [11]. All require sexual stimulation to work and should be taken no more than once a day.

There is no specific contraindication to using PDE5 inhibitors in men with anaemia, provided your anaemia is being treated and you do not have other conditions that make these medicines unsuitable (such as recent heart attack, severe heart failure, or very low blood pressure) [3][4]. Your prescriber will review your full medical history, current medications, and blood pressure during an online consultation to ensure the treatment is safe for you.

Important safety considerations and drug interactions

PDE5 inhibitors must never be taken with nitrates (such as GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites), as the combination can cause a dangerous drop in blood pressure [3][4][5][6]. If you take alpha-blockers for prostate symptoms (such as tamsulosin or doxazosin), you should be stable on that treatment and start on the lowest dose of the PDE5 inhibitor, as both types of medicine can lower blood pressure.

Some medicines can affect how PDE5 inhibitors are broken down in the body. Potent CYP3A4 inhibitors—including ritonavir, cobicistat (found in some HIV medicines), Paxlovid, ketoconazole, itraconazole, and clarithromycin—can raise levels of ED medicines, requiring dose adjustments or avoidance [3][4][5][6]. Conversely, CYP3A4 inducers such as rifampicin, carbamazepine, phenytoin, and St John's wort can reduce effectiveness. Grapefruit juice may also raise levels and should be avoided.

If you take other blood-pressure medicines, the combination with a PDE5 inhibitor can add to the blood-pressure-lowering effect, potentially causing dizziness. This is usually manageable, but you must declare all your current medicines during your consultation. Heavy alcohol can worsen ED and increase the risk of side effects such as dizziness and headache [3][4]. Your prescriber or pharmacist will check every medicine you are taking to ensure the treatment is safe for you.

When ED medicines are not suitable

PDE5 inhibitors are not suitable if sexual activity itself is inadvisable—for example, if you have had a recent heart attack or stroke, unstable angina, or severe heart failure [3][4]. They are also contraindicated if you have a history of non-arteritic anterior ischaemic optic neuropathy (NAION, a form of sudden vision loss) or certain inherited retinal disorders. Your prescriber will assess your suitability during the consultation.

Getting treatment through Cured Pharmacy

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering discreet, convenient access to ED treatments. All prescription medicines are supplied only after an online consultation reviewed by a UK-registered prescriber, who will check your medical history, current medications, and blood pressure to ensure the treatment is safe and appropriate for you.

Once approved, your medication is dispensed by our pharmacy team and delivered discreetly to your door, usually within one to two working days. You can choose from a range of effective treatments at transparent prices, with no hidden fees. If you have questions at any stage, our pharmacists are available to help.

If you have been diagnosed with anaemia and are receiving treatment from your GP, it is important to continue that treatment and attend follow-up appointments. ED medication can be used alongside anaemia treatment, but it does not replace the need to address the underlying cause of your low blood count. If your erectile dysfunction is new or worsening, we encourage you to see your GP first, as ED can be an early sign of cardiovascular disease or diabetes [2]. Our service is designed to complement, not replace, care from your GP.

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. National Institute for Health and Care Excellence. (2014). Erectile dysfunction: avanafil (ESNM45). https://www.nice.org.uk/advice/esnm45 [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.