MUSE Urethral Pellet for Erectile Dysfunction Explained

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At a glance

What is the MUSE urethral pellet for erectile dysfunction?

MUSE (Medicated Urethral System for Erection) is a prescription-only treatment that uses a tiny pellet containing alprostadil, a medicine that helps relax blood vessels and increase blood flow to the penis [7]. The pellet is inserted about 3–6 cm into the urethra (the tube that carries urine) using a single-use plastic applicator, usually 5–10 minutes before sexual activity. Once in place, the pellet dissolves and the alprostadil is absorbed through the urethral lining.

Alprostadil is a synthetic version of prostaglandin E1, a naturally occurring substance in the body that widens blood vessels. By delivering the medicine directly to the erectile tissue, MUSE bypasses the digestive system and may work for men who have not had success with oral tablets or who have medical conditions that make tablets unsuitable [7]. MUSE is available in different strengths (125, 250, 500, and 1000 micrograms), and your prescriber will recommend the lowest effective dose based on your response.

Because MUSE is a prescription-only medicine, it is only supplied after an online or face-to-face consultation with a UK-registered prescriber, who will check your medical history, current medicines, and whether MUSE is safe and appropriate for you. It is not available over the counter or as a pharmacy medicine in the UK.

How does the MUSE urethral pellet work for erectile dysfunction?

MUSE works by delivering alprostadil directly into the urethra, where it is absorbed into the surrounding erectile tissue (the corpus spongiosum and corpus cavernosum). Alprostadil relaxes the smooth muscle in the blood vessels of the penis and increases blood flow, which can help produce an erection [7]. Unlike PDE5 inhibitor tablets (such as sildenafil or tadalafil), which enhance the body's natural response to sexual stimulation, alprostadil acts more directly on the blood vessels themselves.

To use MUSE, you urinate first (this lubricates the urethra and helps the pellet dissolve), then gently insert the applicator tip into the opening of the penis and press the button to release the pellet. After removing the applicator, you gently roll the penis between your hands for about 10 seconds to help distribute the medicine, then sit, stand, or walk for about 10 minutes to encourage blood flow. An erection may develop within 5–10 minutes and can last 30–60 minutes, though this varies between individuals [7].

Sexual stimulation is still helpful, but MUSE does not rely on it in the same way that oral tablets do. This can be an advantage for some men, but it also means that MUSE may occasionally cause an erection even without sexual activity, so it is important to follow the instructions carefully and use it only when you plan to have sex.

Who may benefit from MUSE?

MUSE may be a suitable option for men who cannot take oral ED tablets due to contraindications (for example, those taking nitrates for angina or certain other heart medicines), or who have not responded to PDE5 inhibitors [2][7]. It may also be considered for men who prefer a non-tablet treatment or who experience troublesome side effects from oral medicines. Because MUSE works locally rather than systemically, it generally has fewer interactions with other medicines and may be safer for some men with cardiovascular conditions, though a full medical assessment is still essential.

MUSE is not suitable for everyone. It should not be used if you have urethral stricture (narrowing of the urethra), severe curvature of the penis, conditions that increase the risk of priapism (such as sickle cell disease, leukaemia, or multiple myeloma), or if your partner is pregnant (unless you use a condom, as alprostadil can be transferred during intercourse) [7]. Your prescriber will review your full medical history to ensure MUSE is safe for you.

Effectiveness and clinical evidence for the MUSE urethral pellet

Clinical trials have shown that MUSE can help produce erections sufficient for intercourse in a proportion of men with erectile dysfunction, though response rates vary. In studies, around 30–40% of men achieved erections firm enough for penetration using MUSE, compared with about 10% using placebo [7]. Response rates tend to be higher in men with milder ED and lower in those with more severe vascular or nerve damage (for example, after radical prostatectomy or in advanced diabetes).

MUSE is generally considered less effective overall than oral PDE5 inhibitors, which have success rates of around 60–80% in clinical trials [9]. However, for men who cannot use tablets or who have not responded to them, MUSE offers a valuable alternative. Some men find that combining MUSE with a constriction ring (placed at the base of the penis after insertion) can improve the firmness and duration of the erection, though this should only be done under medical guidance [7].

It is important to have realistic expectations: MUSE may not work for everyone, and it can take several attempts to find the right dose and technique. Your prescriber may suggest trying MUSE on a few occasions before deciding whether it is effective for you. If MUSE does not work, other options such as alprostadil injections (Caverject) or vacuum erection devices may be considered [2].

What you need to know

• MUSE delivers alprostadil directly into the urethra to help increase blood flow and produce an erection.
• It may suit men who cannot take or have not responded to oral ED tablets.
• Success rates are around 30–40%, lower than tablets but useful when tablets are not an option.
• Common side effects include mild burning or discomfort in the penis; serious side effects are rare.
• MUSE is prescription-only and not widely available on the NHS; online consultations offer convenient private access.

Side effects and safety of MUSE for erectile dysfunction

The most common side effects of MUSE are local reactions in the penis or urethra, including mild pain, burning, or discomfort after insertion (reported by around 30–40% of users), and minor urethral bleeding or spotting (in about 5% of men) [7]. These effects are usually mild and tend to lessen with continued use. Some men also experience dizziness or light-headedness, particularly after the first few doses, so it is advisable to sit or lie down for a few minutes after insertion.

Less common but more serious side effects include prolonged erection (priapism), which occurs in fewer than 1% of users but requires urgent medical attention if an erection lasts more than 4 hours, as it can damage the penis [7]. There is also a small risk of low blood pressure or fainting, especially in men taking other blood-pressure medicines. Rarely, female partners may experience vaginal burning or itching due to transfer of alprostadil during intercourse; using a condom can prevent this.

MUSE should not be used if you have a history of hypersensitivity to alprostadil, or if sexual activity is inadvisable due to severe heart disease or recent heart attack or stroke [7]. Because MUSE can lower blood pressure slightly, caution is needed if you are taking antihypertensive medicines, though serious interactions are uncommon. Always tell your prescriber about all your current medicines and medical conditions during the consultation.

What to do if you experience side effects

If you experience mild burning or discomfort after using MUSE, this often improves with practice and as your body adjusts to the treatment. Urinating before insertion and ensuring the urethra is well lubricated can help reduce irritation. If you notice any bleeding, check that you are inserting the applicator gently and not forcing it; if bleeding persists or is heavy, contact your GP or prescriber for advice.

Seek urgent medical help (call 999 or go to A&E) if you develop an erection lasting more than 4 hours, sudden severe dizziness or fainting, chest pain, or any signs of an allergic reaction (such as swelling of the face, lips, or throat, or difficulty breathing). If you experience persistent or troublesome side effects, speak to your prescriber, who may adjust the dose or suggest an alternative treatment.

How the MUSE urethral pellet for erectile dysfunction compares with tablets

Oral PDE5 inhibitor tablets (sildenafil, tadalafil, vardenafil, and avanafil) are the first-line treatment for most men with ED because they are effective, convenient, and well tolerated [2]. They work by enhancing the natural erectile response to sexual stimulation and are taken by mouth, usually 15 minutes to 1 hour before sex, depending on the medicine [3][4][5][6]. Success rates are generally higher with tablets (60–80%) than with MUSE (30–40%), and side effects such as headache, flushing, and indigestion are usually mild and temporary.

However, tablets are not suitable for everyone. Men taking nitrates (such as GTN spray or isosorbide mononitrate) for angina, or nicorandil, cannot use PDE5 inhibitors because the combination can cause a dangerous drop in blood pressure [3]. Tablets may also be less effective in men with severe vascular disease, nerve damage (for example, after prostate surgery), or certain other medical conditions. In these cases, MUSE or other non-tablet treatments such as alprostadil injections, vacuum devices, or penile implants may be considered [2][7].

MUSE has the advantage of working locally with fewer systemic side effects and drug interactions, but it is more invasive to use, can cause local discomfort, and is generally less effective than tablets. Some men prefer the spontaneity of daily tadalafil (which allows sexual activity at any time without planning), while others find the on-demand nature of MUSE or injections more suitable. The choice depends on your individual circumstances, preferences, and medical history, and should be discussed with your prescriber.

When to get urgent help

• Erection lasting more than 4 hours (priapism) – call 999 or go to A&E immediately
• Sudden severe dizziness, fainting, or chest pain after using MUSE – call 999
• Signs of allergic reaction (swelling of face, lips, or throat; difficulty breathing) – call 999
• Heavy or persistent bleeding from the urethra – contact your GP or call 111 for same-day advice

Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.

Availability and accessing MUSE urethral pellets in the UK

MUSE is a prescription-only medicine in the UK and is not available over the counter or as a pharmacy medicine [7]. It can be prescribed by your GP, a specialist urology or sexual health clinic, or through a registered online pharmacy such as Cured Pharmacy after a clinical consultation with a UK-registered prescriber. The prescriber will review your medical history, current medicines, and any previous ED treatments to ensure MUSE is safe and appropriate for you.

MUSE is not routinely available on the NHS in all areas, as local commissioning policies vary. Some Clinical Commissioning Groups (CCGs) or Integrated Care Boards (ICBs) may fund MUSE for men who meet specific criteria (for example, those who cannot use oral tablets or who have ED due to certain medical conditions such as diabetes, prostate surgery, or spinal injury), but many men will need to obtain it privately [2]. Your GP or specialist can advise on local NHS availability and eligibility.

If you are considering MUSE, it is important to see your GP first if you have new or worsening erectile dysfunction, as ED can be an early warning sign of cardiovascular disease, diabetes, or other health conditions that need investigation and treatment [1][2]. Once any underlying causes have been addressed, your GP or a specialist can discuss whether MUSE or another treatment is the best option for you. Online consultations through registered pharmacies offer a convenient and confidential way to access prescription ED treatments, but they are not a substitute for a full medical assessment if you have not been evaluated for ED before.

How to use MUSE safely and effectively

To get the best results from MUSE, follow the instructions provided with the medicine carefully. Always urinate before insertion to lubricate the urethra, and ensure your hands and the applicator are clean. Insert the applicator gently and only as far as is comfortable (usually about 3–6 cm), press the button to release the pellet, then remove the applicator and roll the penis gently between your hands for about 10 seconds. Sit, stand, or walk for about 10 minutes to encourage blood flow, and avoid lying down immediately after insertion [7].

Do not use MUSE more than once in 24 hours, and do not use it with other ED treatments (such as tablets or injections) unless specifically advised by your prescriber. If you are using a constriction ring, apply it only after the pellet has been inserted and the erection has started to develop, and remove it after 30 minutes to avoid tissue damage. Store MUSE in the refrigerator (2–8°C) and allow it to reach room temperature before use. If you have any questions or difficulties using MUSE, contact your prescriber or pharmacist for advice.

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