MUSE Urethral Pellet Side Effects Explained

MUSE Urethral Pellet Side Effects: What You Need to Know

Published: 14 November 2026

MUSE urethral pellet side effects are an important consideration if you're exploring alternatives to oral erectile dysfunction tablets. MUSE (Medicated Urethral System for Erection) is a prescription treatment containing alprostadil, a medicine that works directly in the penis to help achieve an erection. Understanding how it works, who it may suit, and the potential side effects can help you make an informed choice about your ED treatment.

What is MUSE and how does it work?

MUSE is a small pellet (also called a suppository) that contains alprostadil, a synthetic version of a naturally occurring substance called prostaglandin E1. You insert the pellet into the opening of the urethra (the tube that carries urine) using a special applicator. Once inside, the pellet dissolves and the alprostadil is absorbed through the urethral lining into the surrounding erectile tissue [7].

Unlike oral tablets such as sildenafil or tadalafil, which work by blocking an enzyme called PDE5 to improve blood flow when you're sexually aroused, alprostadil works more directly. It relaxes the smooth muscle in the blood vessels of the penis and widens them, allowing more blood to flow in and produce an erection. This means MUSE can work without sexual stimulation, though arousal may still improve the response [7].

MUSE is typically used about 5 to 10 minutes before sexual activity. The erection usually develops within 10 to 20 minutes and may last for 30 to 60 minutes. Because it bypasses the digestive system and liver, MUSE may be an option for men who cannot take oral ED tablets due to certain medical conditions or drug interactions [7].

Common muse urethral pellet side effects

The most frequently reported side effect of MUSE is a mild aching or burning sensation in the penis, which occurs in a significant proportion of users. This discomfort is usually mild and temporary, fading within a few minutes after insertion. Some men also experience urethral pain, stinging, or minor bleeding or spotting from the urethra, particularly during the first few uses [7].

Dizziness or light-headedness can occur, especially if you stand up too quickly after inserting the pellet. This is because alprostadil can lower blood pressure slightly. To reduce this risk, it's recommended that you sit or lie down for a few minutes after insertion and then stand up slowly. A small number of men may experience fainting, so it's important to follow the instructions carefully [7].

Other side effects may include headache, testicular pain, and warmth or redness in the legs. Rarely, MUSE can cause a prolonged erection lasting more than four hours (priapism), which requires urgent medical attention to prevent permanent damage. If you experience an erection that won't go down, go to A&E immediately [7].

Side effects in female partners

Female partners may occasionally experience vaginal itching, burning, or irritation after intercourse. This is thought to be due to transfer of alprostadil during sex. If your partner is pregnant or could become pregnant, you should use a condom during intercourse, as the effects of alprostadil on pregnancy are not fully known. Always discuss any concerns with your prescriber [7].

Who might consider MUSE urethral pellets?

MUSE may be suitable for men who cannot take or do not respond well to oral ED tablets. For example, if you take nitrate medicines for angina (such as GTN spray or isosorbide mononitrate), you cannot safely use PDE5 inhibitors like sildenafil or tadalafil because the combination can cause a dangerous drop in blood pressure. MUSE works by a different mechanism and does not have this interaction, so it may be a safer alternative in such cases [7].

Some men find that oral tablets are not effective enough, or they experience troublesome side effects such as headaches, flushing, or indigestion. Others may have conditions that affect the absorption of oral medicines, such as severe diabetes with nerve damage (neuropathy). MUSE offers a different route of administration that may work when tablets do not [7].

However, MUSE is not suitable for everyone. It should not be used if you have certain conditions affecting the penis (such as severe curvature, Peyronie's disease, or a history of priapism), urethral stricture or inflammation, or if you are at risk of blood clots. It is also not recommended if your partner is pregnant unless you use a condom. Your prescriber will assess your suitability during the consultation [7].

How effective is MUSE compared with oral ED tablets?

Clinical studies have shown that MUSE can help some men achieve an erection sufficient for intercourse, but success rates vary. In trials, around 30 to 40 per cent of men reported successful intercourse using MUSE, though individual results depend on the underlying cause of ED, the dose used, and proper technique [7].

By comparison, oral PDE5 inhibitors such as sildenafil, tadalafil, vardenafil, and avanafil have higher reported success rates, often in the range of 60 to 80 per cent or more in clinical trials [9]. These tablets are generally considered the first-line treatment for ED because they are effective, convenient, and well tolerated by most men [2].

That said, MUSE can be a valuable option for men who cannot use or do not respond to tablets. It is also available on the NHS in some circumstances, though availability varies by local commissioning policies. Many men who try MUSE find that the technique improves with practice, and side effects often lessen over time [2][7].

Tips for using MUSE effectively

To get the best results from MUSE, it's important to follow the instructions carefully. Empty your bladder before insertion, as a small amount of urine helps dissolve the pellet. After inserting the pellet, gently roll the penis between your hands for about 10 seconds to help distribute the medicine. Then sit or lie down for a few minutes to allow the alprostadil to be absorbed and to reduce the risk of dizziness [7].

Is MUSE available on the NHS?

MUSE (alprostadil urethral pellets) is a prescription-only medicine and may be available on the NHS in certain circumstances, depending on your local clinical commissioning group (CCG) or integrated care board (ICB) policies. NHS prescribing of ED treatments is generally restricted to men with specific underlying conditions, such as diabetes, prostate cancer treatment, spinal cord injury, or other medical causes of ED [2].

If you do not meet the NHS criteria, or if MUSE is not available in your area, you can obtain it privately through a registered online pharmacy or your GP. A private prescription requires a clinical assessment by a UK-registered prescriber, who will review your medical history, current medicines, and suitability for alprostadil [2].

At Cured Pharmacy, our GPhC-registered service includes an online consultation reviewed by a UK prescriber. While we do not currently stock MUSE urethral pellets, we offer a wide range of oral ED treatments, including generic and branded options, which may be more convenient and effective for many men. If you're interested in exploring alternatives to MUSE, our team can help you find the right treatment.

How do muse urethral pellet side effects compare with oral ED tablets?

When comparing muse urethral pellet side effects with those of oral ED tablets, the main difference is the type and location of side effects. MUSE tends to cause local effects in the penis and urethra, such as aching, burning, or minor bleeding, whereas oral tablets more commonly cause systemic side effects like headache, flushing, indigestion, and nasal congestion [3][4][7].

Oral PDE5 inhibitors can also cause visual disturbances (such as a blue tinge to vision with sildenafil) and, rarely, sudden hearing loss. Dizziness and low blood pressure can occur with both MUSE and oral tablets, but the risk is generally higher with tablets if you are taking certain other medicines, such as alpha-blockers for prostate symptoms [3][4][7].

One advantage of MUSE is that it avoids many of the drug interactions associated with oral tablets. For example, you cannot take sildenafil, tadalafil, vardenafil, or avanafil if you use nitrate medicines, but MUSE does not have this restriction. However, MUSE requires more preparation and technique, and some men find the insertion process uncomfortable or inconvenient. The choice between MUSE and oral tablets depends on your individual circumstances, preferences, and medical history [2][7].

Other non-tablet options for ED

In addition to MUSE, other non-tablet treatments for ED include Vitaros (alprostadil cream applied to the tip of the penis), Caverject (alprostadil injection into the side of the penis), vacuum erection devices, and penile implants. Eroxon is a topical gel medical device available without prescription that works by cooling and warming the penis to stimulate blood flow. Each option has its own benefits and drawbacks, and your prescriber can help you decide which is most suitable [2][7].

Scientific References

1. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 14 November 2026]
2. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 14 November 2026]
3. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 14 November 2026]
4. Joint Formulary Committee. (n.d.). Alprostadil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/alprostadil/ [accessed 14 November 2026]
5. Goldstein, I., Lue, T. F., Padma-Nathan, H., Rosen, R. C., Steers, W. D., & Wicker, P. A. (1998). Oral sildenafil in the treatment of erectile dysfunction. New England Journal of Medicine, 338(20), 1397–1404. https://pubmed.ncbi.nlm.nih.gov/9580646/ [accessed 14 November 2026]
6. NHS. (n.d.). Erectile dysfunction (impotence). https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ Accessed 14 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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