Can Cimetidine Cause Erectile Dysfunction?
Learn how this medicine affects erections and explore safe treatment options with a UK pharmacist consultation.
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Cimetidine and Erectile Dysfunction: What You Need to Know
Published: 12 November 2026
Cimetidine erectile dysfunction is a recognised side effect of this medicine, which is used to treat stomach ulcers and acid reflux. While not everyone experiences sexual problems on cimetidine, it is one of the medicines more commonly linked to erection difficulties. This page explains how cimetidine may affect your sexual function, what you should never do, and the treatment options you can discuss with your doctor or pharmacist.
At a glance
How Does Cimetidine Cause Erectile Dysfunction?
Cimetidine belongs to a group of medicines called H2-receptor antagonists (H2 blockers), which reduce stomach acid production. Unlike other H2 blockers such as ranitidine or famotidine, cimetidine has anti-androgenic properties—it can interfere with the action of male hormones (androgens) in the body [2]. This hormonal effect is thought to be the main reason why cimetidine is more likely than other H2 blockers to cause sexual side effects, including erectile dysfunction and reduced libido.
Cimetidine may also raise levels of the hormone prolactin, which can further suppress testosterone and contribute to erection problems. These effects are dose-related, meaning higher doses and longer treatment courses carry a greater risk. The good news is that sexual side effects are usually reversible if the medicine is stopped or changed, though you must never stop a prescribed medicine without first speaking to your doctor [1][2].
How Common Is Erectile Dysfunction with Cimetidine?
Erectile dysfunction and other sexual side effects (such as reduced sex drive or, rarely, breast enlargement in men) are well-documented with cimetidine, but they do not affect everyone. The exact frequency varies between studies, but sexual problems are reported more often with cimetidine than with other H2 blockers or proton pump inhibitors (PPIs) such as omeprazole or lansoprazole [2].
Most people taking cimetidine for short courses (a few weeks) are less likely to experience sexual side effects than those on long-term treatment. Higher doses—sometimes used for conditions like Zollinger-Ellison syndrome—also increase the risk. If you notice changes in your erections or sex drive after starting cimetidine, it is important to discuss this with your GP or prescriber. They can review whether the medicine is still the best option for you and explore alternatives that are less likely to affect sexual function.
What You Should Never Do
If you suspect cimetidine is affecting your erections, never stop taking it suddenly without medical advice. Cimetidine is prescribed to treat conditions such as stomach ulcers, gastro-oesophageal reflux disease (GORD), and Zollinger-Ellison syndrome. Stopping abruptly can lead to a return of symptoms, including increased stomach acid, pain, and potential complications such as bleeding ulcers [2].
Similarly, do not reduce your dose or switch to another medicine on your own. Your prescriber needs to review your overall treatment plan, consider why cimetidine was chosen in the first place, and ensure any alternative is safe and appropriate for your condition. Self-adjusting your medication can put your health at risk and may not solve the problem.
The Importance of a Medical Review
A proper medical review allows your doctor to assess whether your erectile dysfunction is definitely linked to cimetidine or whether other factors—such as underlying health conditions, stress, or other medicines—might be contributing. Erectile dysfunction can be an early warning sign of cardiovascular disease or diabetes, so it is always worth a thorough check-up [1][2].
What you need to know
- Cimetidine can cause erectile dysfunction due to its anti-androgenic effects on male hormones.
- Never stop cimetidine without medical advice—discuss alternatives with your prescriber first.
- Other H2 blockers and PPIs are less likely to affect sexual function.
- ED tablets like sildenafil and tadalafil can usually be used safely alongside cimetidine.
- Erectile dysfunction from cimetidine is usually reversible if the medicine is changed.
Options to Discuss with Your Prescriber
If cimetidine is causing erectile dysfunction, your prescriber has several options to consider. The first is switching to a different medicine that treats your stomach condition but is less likely to affect sexual function. Other H2 blockers, such as famotidine, do not have the same anti-androgenic effects and are rarely associated with erectile problems. Proton pump inhibitors (PPIs) like omeprazole, lansoprazole, or pantoprazole are also effective for acid-related conditions and are not commonly linked to sexual side effects [2].
In some cases, your prescriber may reduce the dose of cimetidine or shorten the treatment course if your condition allows. For people who need to stay on cimetidine for specific medical reasons, treating the erectile dysfunction itself may be an option. This might involve lifestyle changes (stopping smoking, losing weight, reducing alcohol, increasing exercise) or prescription medicines such as PDE5 inhibitors (sildenafil, tadalafil, vardenafil, or avanafil), which can usually be used safely alongside cimetidine [1][2].
Lifestyle Measures That Help
Regardless of the cause, improving cardiovascular health benefits erectile function. Regular physical activity, a balanced diet, maintaining a healthy weight, limiting alcohol, and stopping smoking all improve blood flow and can make a significant difference to erections. These measures work well alongside any medical treatment your doctor recommends [1].
Can You Use ED Tablets with Cimetidine?
Yes, PDE5 inhibitor tablets for erectile dysfunction—such as sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra), and avanafil (Spedra)—can usually be used safely alongside cimetidine. Cimetidine is a weak inhibitor of certain liver enzymes (CYP3A4 and CYP2C19), which means it can slightly raise the levels of some medicines in the bloodstream. However, this interaction with PDE5 inhibitors is generally mild and does not usually require dose adjustments [3][4][5][6].
Your prescriber or pharmacist will check your full list of current medicines during the consultation to ensure there are no other contraindications. You must never take PDE5 inhibitors if you are also using nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, or recreational drugs called 'poppers', as the combination can cause a dangerous drop in blood pressure. If you take alpha-blockers (for prostate or blood pressure), you should be stable on that medicine and start on the lowest dose of the PDE5 inhibitor [3][4][5][6].
At Cured Pharmacy, all ED treatments require an online consultation reviewed by a UK-registered prescriber, who will confirm the treatment is safe and suitable for you.
When to get urgent help
- Erection lasting more than 4 hours (priapism) after taking ED treatment
- Sudden loss of vision or hearing after taking ED tablets
- Chest pain during or after sexual activity
- Severe stomach pain, vomiting blood, or black tarry stools (possible bleeding ulcer)
- Allergic reaction (swelling of face, lips, tongue, or difficulty breathing)
Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.
How Cured Pharmacy Can Help with Cimetidine Erectile Dysfunction
If you are experiencing erectile dysfunction while taking cimetidine, Cured Pharmacy offers a discreet, convenient way to access treatment after a clinical consultation. Our service is led by UK-registered pharmacists and prescribers, and every order is reviewed to ensure it is safe and appropriate for you. We stock a full range of licensed ED treatments, including generic and branded options, all delivered discreetly to your door.
You can complete a short online consultation at a time that suits you. The prescriber will review your current medicines (including cimetidine), your medical history, and any other factors that might affect your treatment. If a PDE5 inhibitor is suitable, you can choose from sildenafil, tadalafil, vardenafil, or avanafil, with prices starting from as little as £0.45 per tablet. First-time customers can use the code Ednew for 20% off their first order.
Remember, while we can help treat erectile dysfunction, we cannot change your prescribed cimetidine. If you believe cimetidine is causing your symptoms, you should discuss this with your GP or the doctor who prescribed it. They can review your treatment and consider alternatives if appropriate. Our role is to provide safe, effective ED treatment once your prescriber has confirmed it is suitable for you [1][2].
Why Choose Cured Pharmacy?
Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) based in the UK. We combine clinical expertise with genuine care, offering clear advice, transparent pricing, and fast, discreet delivery. Our pharmacists are here to answer your questions and support you every step of the way.
Never Stop Cimetidine Suddenly
If you think cimetidine is affecting your erections, speak to your GP or prescriber before making any changes. They can review your treatment and suggest safer alternatives without risking your stomach health.
Scientific References
- NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 12 November 2026]
- National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 12 November 2026]
- Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 12 November 2026]
- Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 12 November 2026]
- Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 12 November 2026]
- Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 12 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.
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Common Questions
Does cimetidine always cause erectile dysfunction?
No, not everyone experiences erectile dysfunction on cimetidine. Sexual side effects are more common with cimetidine than other similar medicines, but many people take it without any problems.
Can I stop cimetidine if it's affecting my erections?
Never stop cimetidine without speaking to your doctor first. Stopping suddenly can cause your stomach symptoms to return and may lead to complications such as bleeding ulcers.
Are other H2 blockers safer for erectile function?
Yes, other H2 blockers such as famotidine do not have the same anti-androgenic effects as cimetidine and are much less likely to cause sexual side effects.
Will my erections come back if I stop cimetidine?
Sexual side effects from cimetidine are usually reversible. If you switch to a different medicine or stop cimetidine (under medical supervision), erectile function typically improves over time.
Can I take Viagra or Cialis while on cimetidine?
Yes, PDE5 inhibitors such as sildenafil (Viagra) and tadalafil (Cialis) can usually be used safely with cimetidine. Your prescriber will check your full medication list during the consultation.
Is cimetidine the only medicine that can cause erectile dysfunction?
No, many medicines can affect erections, including some blood pressure tablets, antidepressants, and diuretics. Always discuss any concerns with your doctor or pharmacist.
Do I need to see my GP before using Cured Pharmacy?
You do not need a GP referral to use Cured Pharmacy. Our online consultation is reviewed by a UK-registered prescriber who will assess whether ED treatment is safe and suitable for you.
How quickly will ED treatment work if cimetidine is the cause?
PDE5 inhibitors work within 15 minutes to 1 hour (depending on the type) and can help achieve erections even if cimetidine is contributing to the problem. However, discussing a medicine review with your GP is also important.
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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.
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Medically reviewed by
Tarun Kumar, Superintendent Pharmacist (GPhC 2233073)