High Prolactin and Erectile Dysfunction Explained

High Prolactin and Erectile Dysfunction: Causes, Diagnosis and Treatment

Published: 14 October 2026

High prolactin and erectile dysfunction are closely connected, as elevated levels of the hormone prolactin can interfere with sexual function and reduce libido in men. Prolactin is normally present in small amounts, but when levels rise—a condition called hyperprolactinaemia—it can suppress testosterone production and directly affect the ability to achieve or maintain an erection [1][2]. Understanding this link is the first step toward effective treatment, which may involve addressing the underlying cause of high prolactin as well as using medications to restore erectile function.

What is high prolactin and how does it cause erectile dysfunction?

Prolactin is a hormone produced by the pituitary gland, a small structure at the base of the brain. In men, prolactin levels are usually low, but certain conditions—such as a benign pituitary tumour (prolactinoma), underactive thyroid, kidney disease, or the use of some medications—can cause levels to rise [1][2]. High prolactin interferes with the release of gonadotropin-releasing hormone (GnRH), which in turn reduces the production of luteinising hormone (LH) and follicle-stimulating hormone (FSH). This cascade suppresses testosterone production in the testes, leading to low testosterone levels.

Testosterone plays a central role in sexual desire and the physiological processes that lead to an erection. When testosterone is low, libido often falls and the nerves and blood vessels involved in erections may not respond as effectively to sexual stimulation [2]. High prolactin can also have a direct inhibitory effect on sexual arousal and erectile function, independent of its impact on testosterone. As a result, men with hyperprolactinaemia commonly experience reduced sexual desire, difficulty achieving erections, and sometimes other symptoms such as breast enlargement (gynaecomastia) or reduced facial and body hair.

How is high prolactin and erectile dysfunction diagnosed?

If you are experiencing erectile dysfunction alongside symptoms such as low libido, fatigue, or unexplained breast tissue changes, your GP may arrange blood tests to check your hormone levels [1][2]. A prolactin blood test is usually taken in the morning, as prolactin levels naturally fluctuate throughout the day. Because stress, exercise, and even the act of having blood drawn can temporarily raise prolactin, your doctor may repeat the test if the first result is elevated, to confirm the diagnosis.

If high prolactin is confirmed, further investigations are typically needed to identify the cause. These may include tests for thyroid function (thyroid-stimulating hormone, or TSH), kidney function, and a review of all your current medications, as some drugs—including certain antipsychotics, antidepressants, and medicines for nausea—can raise prolactin levels [2]. If no obvious cause is found, or if prolactin is very high, your GP may refer you for an MRI scan of the pituitary gland to check for a prolactinoma or other structural abnormality. A full assessment also includes measuring testosterone levels, as low testosterone often accompanies high prolactin and contributes significantly to erectile dysfunction.

Why seeing your GP is important

Erectile dysfunction can be an early warning sign of other health conditions, including cardiovascular disease and diabetes, so it is important to see your GP if you develop new or worsening erection problems [1]. High prolactin itself may indicate an underlying condition that requires specific treatment, such as a pituitary tumour or thyroid disorder. Your GP can arrange the necessary tests, refer you to a specialist if needed, and work with you to develop a treatment plan that addresses both the cause of high prolactin and your erectile function.

Lifestyle measures for high prolactin and erectile dysfunction

While lifestyle changes alone will not lower prolactin levels if the cause is a pituitary tumour or medication, they can support overall sexual health and improve the effectiveness of medical treatment [1][2]. Maintaining a healthy weight, eating a balanced diet rich in fruits, vegetables, whole grains, and lean protein, and taking regular physical activity can all help optimise testosterone levels and cardiovascular health, both of which are important for erectile function.

Reducing alcohol intake is particularly important, as heavy drinking can worsen erectile dysfunction and may also raise prolactin levels [1]. Smoking damages blood vessels and impairs blood flow to the penis, so stopping smoking can improve erections over time. Managing stress through relaxation techniques, adequate sleep, and open communication with your partner can also help, as psychological factors often interact with physical causes of ED. If a medication you are taking is contributing to high prolactin, your doctor may be able to adjust the dose or switch you to an alternative, but you should never stop or change a prescribed medicine without medical advice.

Treatment options for high prolactin and erectile dysfunction

Treatment for high prolactin and erectile dysfunction usually involves addressing the underlying cause of elevated prolactin as well as providing symptomatic relief for erectile problems. If a prolactinoma is identified, the first-line treatment is usually a dopamine agonist medication such as cabergoline or bromocriptine, which can effectively lower prolactin levels, shrink the tumour, and restore testosterone production [2]. Many men find that their libido and erectile function improve significantly once prolactin is brought under control and testosterone levels rise.

However, it can take several weeks or months for hormone levels to normalise and for sexual function to fully recover. In the meantime, or if erectile dysfunction persists despite normalisation of prolactin and testosterone, oral PDE5 inhibitor medications can be very helpful [1][2]. These medicines—sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra), and avanafil (Spedra)—work by increasing blood flow to the penis in response to sexual stimulation, making it easier to achieve and maintain an erection. They do not affect prolactin or testosterone levels, but they can restore erectile function while the underlying hormonal issue is being treated. All PDE5 inhibitors require a prescription and are only supplied after an online consultation reviewed by a UK prescriber.

How PDE5 inhibitors work

PDE5 inhibitors block the enzyme phosphodiesterase type 5, which breaks down a substance called cyclic GMP that relaxes smooth muscle in the blood vessels of the penis [3][4][5][6]. By preventing the breakdown of cyclic GMP, these medicines allow blood vessels to stay dilated for longer, improving blood flow and making it easier to get an erection when sexually aroused. They do not cause an erection on their own—sexual stimulation is still needed—and they do not increase libido or alter hormone levels. The choice of PDE5 inhibitor depends on individual preference, how quickly you want the medicine to work, and how long you want the effect to last.

Specific treatment cautions for high prolactin and erectile dysfunction

If you have high prolactin, it is important that your prescriber is aware of this and of any other medical conditions or medications you are taking, as some combinations can be unsafe [3][4][5][6]. PDE5 inhibitors must never be taken with nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites), as the combination can cause a dangerous fall in blood pressure. If you are taking an alpha-blocker for prostate symptoms or high blood pressure (such as doxazosin, tamsulosin, or alfuzosin), there is a risk of dizziness or low blood pressure when starting a PDE5 inhibitor; you should be stable on the alpha-blocker and start on the lowest dose of the ED medicine.

Some medicines used to treat infections or HIV—such as ritonavir, cobicistat, ketoconazole, itraconazole, or clarithromycin—can raise the levels of PDE5 inhibitors in your blood, increasing the risk of side effects [3][4][5][6]. Your prescriber will check the specific product information (SmPC) and may need to reduce the dose or avoid certain PDE5 inhibitors altogether. Conversely, medicines that speed up the breakdown of drugs in the liver (such as rifampicin, carbamazepine, phenytoin, or St John's wort) can make PDE5 inhibitors less effective. If you are taking dopamine agonists for high prolactin, there are no major direct interactions with PDE5 inhibitors commonly reported, but your prescriber will review all your current medicines during the consultation to ensure safe prescribing.

Choosing the right erectile dysfunction treatment at Cured Pharmacy

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering a range of licensed oral ED treatments, all supplied following an online consultation reviewed by a UK-registered prescriber. Sildenafil (generic Viagra) is available from £0.45 per tablet (£0.36 with first-order code Ednew) and is taken about one hour before sex, with effects lasting around four hours [3]. Tadalafil (generic Cialis) is available from £7.95 (£6.36 with code Ednew) and can be taken on-demand at least 30 minutes before sex, with effects lasting up to 36 hours, or as a lower daily dose for continuous readiness [4].

Other options include vardenafil (generic Levitra) at £16.95 (£13.56 with code Ednew), which works in about 25–60 minutes, and avanafil (Spedra) at £20.95 (£16.76 with code Ednew), which can work in as little as 15–30 minutes [5][6]. Branded versions—Viagra at £37.95 (£30.36 with code Ednew) and Cialis at £12.00 (£9.60 with code Ednew)—are also available. All these medicines require sexual stimulation to work and are taken as needed, with a maximum of one dose per day. Your prescriber will help you choose the most suitable option based on your medical history, current medications, and personal preferences.

What to expect from treatment

PDE5 inhibitors can be very effective for erectile dysfunction, including when it is related to high prolactin, but they do not work for everyone and results can vary [1][2]. In clinical trials, these medicines have helped a significant proportion of men achieve erections sufficient for sexual activity, but individual response depends on many factors, including the severity of ED, other health conditions, and whether the underlying cause of high prolactin is being treated. It may take a few attempts to find the right dose and timing, and it is important to follow the instructions provided and not exceed the recommended dose. If one PDE5 inhibitor does not work well for you, another may be more suitable, and your prescriber can discuss alternatives during follow-up.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 14 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 14 October 2026]
3. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 14 October 2026]
4. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 14 October 2026]
5. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 14 October 2026]
6. Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 14 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.

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