Parkinson's Disease and Erectile Dysfunction

Parkinson's Disease and Erectile Dysfunction: Causes, Assessment and Treatment

Published: 13 October 2026

Parkinson's disease and erectile dysfunction (ED) are closely linked, with up to 75% of men with Parkinson's experiencing some degree of erectile difficulty [2]. The connection involves both the neurological changes caused by Parkinson's itself and the side effects of some medications used to manage the condition. Understanding this relationship is essential for finding safe, effective treatment that works alongside your Parkinson's care.

Why does Parkinson's disease cause erectile dysfunction?

Parkinson's disease affects erectile function through several mechanisms [2]. The condition damages the autonomic nervous system, which controls involuntary functions including blood flow to the penis. This neurological damage can disrupt the signals needed to achieve and maintain an erection, even when sexual desire remains normal.

The dopamine deficiency that characterises Parkinson's also plays a role. Dopamine is involved in sexual arousal and motivation, so reduced levels can lower libido and make erections more difficult. Additionally, the physical symptoms of Parkinson's—such as tremor, rigidity, and reduced mobility—can affect confidence and make sexual activity more challenging.

Some medications used to treat Parkinson's can either help or worsen erectile function. Levodopa and dopamine agonists (such as ropinirole or pramipexole) may improve sexual function in some men by restoring dopamine levels, but they can also cause side effects including low blood pressure, which may contribute to ED. Depression and anxiety, which are common in Parkinson's, further increase the risk of erectile difficulties [1][2].

How is erectile dysfunction assessed in men with Parkinson's disease?

A thorough assessment is essential because ED in Parkinson's disease has multiple potential causes [2]. Your GP or specialist will review your Parkinson's history, current medications, and any other health conditions such as diabetes or cardiovascular disease, which are also risk factors for ED.

The assessment typically includes questions about when the erectile difficulties began, whether they coincide with changes in Parkinson's medication, and whether morning or spontaneous erections still occur. This helps distinguish between physical causes (such as nerve damage or blood flow problems) and psychological factors like anxiety or depression.

Blood tests may be arranged to check testosterone levels, blood sugar, and cholesterol, as these can all contribute to ED. Your doctor will also assess your cardiovascular health, because erectile dysfunction can be an early warning sign of heart disease [1]. If you haven't already done so, it's important to see your GP for a full evaluation before starting any ED treatment, particularly if you have Parkinson's disease.

The role of your Parkinson's care team

Your neurologist or Parkinson's nurse specialist should be informed about erectile difficulties, as they may be able to adjust your Parkinson's medications to reduce side effects that worsen ED. Some men find that timing doses differently or switching between dopamine agonists can help. Open communication with your care team ensures that both your Parkinson's symptoms and sexual health are managed together.

Lifestyle measures for parkinson's disease and erectile dysfunction

Lifestyle changes can improve both Parkinson's symptoms and erectile function [1][2]. Regular physical activity—adapted to your mobility level—helps maintain cardiovascular health, improves mood, and can enhance blood flow. Physiotherapy and exercises designed for Parkinson's patients can also improve confidence and physical stamina.

A balanced diet supports overall health and may slow Parkinson's progression. Reducing alcohol intake is particularly important, as heavy drinking worsens both ED and Parkinson's symptoms. Smoking damages blood vessels and significantly increases the risk of erectile problems, so stopping smoking is one of the most effective steps you can take [1].

Managing stress, anxiety, and depression is crucial. Psychological support, whether through counselling, cognitive behavioural therapy, or peer support groups, can improve quality of life and sexual confidence. Some men find that involving their partner in discussions about ED and Parkinson's reduces performance anxiety and strengthens intimacy. Sleep disturbances are common in Parkinson's and can worsen ED, so addressing sleep problems with your care team may also help.

Oral ED treatments for men with Parkinson's disease

PDE5 inhibitor tablets—such as sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra), and avanafil (Spedra)—are often effective for men with Parkinson's disease and are generally safe when prescribed appropriately [2][3][4][5][6]. These medicines work by increasing blood flow to the penis when you are sexually aroused; they do not cause automatic erections and require sexual stimulation to work.

Sildenafil is usually taken about one hour before sex and works for up to four hours [3]. Tadalafil can be taken on-demand (at least 30 minutes before sex, with effects lasting up to 36 hours) or as a lower daily dose [4]. Vardenafil works within 25–60 minutes [5], while avanafil is the fastest-acting option, often effective within 15–30 minutes [6]. Your prescriber will recommend the most suitable option based on your Parkinson's medications and overall health.

Because many men with Parkinson's take medications that lower blood pressure—particularly if they also take alpha-blockers for urinary symptoms—it is essential that your prescriber reviews all your current medicines before prescribing a PDE5 inhibitor. The combination of a PDE5 inhibitor and an alpha-blocker (such as tamsulosin or doxazosin) can cause dizziness or fainting due to low blood pressure; if both are needed, you should be stable on the alpha-blocker and start on the lowest PDE5 dose [3][4][5][6].

Important safety considerations

PDE5 inhibitors must never be taken with nitrates (GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational drugs called 'poppers', as this combination can cause a dangerous drop in blood pressure [3][4][5][6]. Some Parkinson's patients also take medications that interact with PDE5 inhibitors, so a full medication review during your consultation is essential. Grapefruit juice can raise PDE5 levels and should be avoided.

Alternative and additional treatments

If oral tablets are not suitable or effective, other prescription options are available [2][7]. Alprostadil is a medicine that can be applied as a cream (Vitaros) inserted into the opening of the penis, or given as a small injection (Caverject) into the side of the penis. These treatments work locally to increase blood flow and can be effective when PDE5 inhibitors are not.

Vacuum erection devices are non-drug options that use gentle suction to draw blood into the penis, with a constriction ring placed at the base to maintain the erection. These devices are available on prescription and can be particularly useful for men who cannot take oral medications due to interactions or other health conditions.

Psychological support and sex therapy can be valuable, especially when anxiety, depression, or relationship difficulties contribute to ED. Your GP can refer you to appropriate services. Some men find that combining treatments—for example, using a PDE5 inhibitor alongside counselling—provides the best results. It's important to discuss all options with your healthcare team to find the approach that works best for you and fits with your Parkinson's management plan.

Getting treatment through Cured Pharmacy

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering discreet access to ED treatments after a clinical consultation reviewed by a UK-registered prescriber. All prescription medicines, including sildenafil, tadalafil, vardenafil, and avanafil, are only supplied following an online assessment where you provide details of your Parkinson's disease, current medications, and overall health.

During the consultation, the prescriber will check for any interactions between your Parkinson's medications and the ED treatment, ensuring it is safe and appropriate for you. This is particularly important if you take alpha-blockers, blood pressure medicines, or any other drugs that may interact with PDE5 inhibitors. You should never stop or change a prescribed medicine without advice from your doctor or specialist.

If approved, your medication is dispensed by UK pharmacists and delivered discreetly to your home. First-time customers can use the code Ednew for a discount on their first order. However, if you have not yet discussed erectile difficulties with your GP or Parkinson's care team, it is advisable to do so, as ED can sometimes indicate other health issues that need attention [1][2]. Cured Pharmacy's service complements, but does not replace, the care provided by your GP and specialist team.

Ongoing support and monitoring

ED treatment in Parkinson's disease may need adjustment over time as your condition or medications change. Regular follow-up with your GP and Parkinson's team ensures that both your neurological and sexual health are managed effectively. If a treatment stops working or causes side effects, your prescriber can suggest alternatives or adjust the dose.

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.