Can Naltrexone Cause Erectile Dysfunction?

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Can Naltrexone Cause Erectile Dysfunction?

Naltrexone is an opioid receptor antagonist prescribed to help people reduce alcohol consumption or maintain abstinence from opioids. It works by blocking opioid receptors in the brain, which reduces cravings and the rewarding effects of alcohol and opioids. While naltrexone is generally well tolerated, sexual side effects including erectile dysfunction have been reported in some men taking the medication [12].

The exact mechanism by which naltrexone may affect erectile function is not fully understood. Opioid receptors play a complex role in sexual function and arousal, and blocking these receptors may interfere with normal sexual response in some individuals. However, it's important to note that erectile dysfunction can have many causes, including psychological factors related to recovery, underlying health conditions, and other medications [1].

The reported incidence of sexual dysfunction with naltrexone varies across studies, but it appears to be relatively uncommon. Most men taking naltrexone do not experience erectile problems. If you do notice changes in your erections after starting naltrexone, it's essential to discuss this with your prescriber rather than stopping the medication on your own, as naltrexone plays an important role in your treatment plan.

How Common Is Naltrexone Erectile Dysfunction?

Sexual side effects, including erectile dysfunction, are not listed among the most frequent adverse effects of naltrexone in clinical trials. The most commonly reported side effects include nausea, headache, dizziness, fatigue, and sleep disturbances [12]. However, sexual dysfunction has been documented in post-marketing reports and some clinical studies, though precise frequency data is limited.

It's worth noting that erectile dysfunction is relatively common in men with a history of alcohol or substance use disorders, even before starting treatment. Chronic alcohol use can directly damage blood vessels and nerves involved in erections, and psychological factors such as anxiety, depression, and stress—which often accompany addiction and recovery—are also significant contributors to ED [1][10].

If you experience erectile difficulties while taking naltrexone, it can be challenging to determine whether the medication is the cause or whether other factors are involved. Your prescriber can help assess the likely cause by reviewing your medical history, the timing of symptoms, and any other medications or health conditions that might contribute to erectile dysfunction. Never assume naltrexone is the cause without a proper evaluation.

Other Factors That May Contribute to ED During Treatment

Recovery from alcohol or opioid dependence is a complex process that can affect sexual function in multiple ways. Psychological factors such as anxiety about relapse, relationship stress, or depression can all contribute to erectile difficulties. Additionally, if you're taking other medications alongside naltrexone—such as antidepressants, blood pressure medicines, or other treatments—these may also affect erections [1][2]. Your prescriber will consider all these factors when helping you understand the cause of any erectile problems you experience.

When to get urgent help

• Erection lasting more than 4 hours after taking ED medication (priapism)—go to A&E immediately
• Sudden loss of vision or hearing after taking ED tablets—seek urgent medical help
• Chest pain during or after sexual activity—call 999 and do not take more ED medication
• Severe dizziness, fainting, or very low blood pressure after combining ED tablets with other medicines
• New or worsening erectile dysfunction alongside chest pain, breathlessness, or other heart symptoms—see your GP urgently

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

What NOT to Do If You Experience Naltrexone and Erection Problems

If you notice erectile difficulties after starting naltrexone, the most important thing is never to stop taking your prescribed medication without first speaking to your doctor or prescriber. Naltrexone is an essential part of your treatment for alcohol or opioid dependence, and stopping it abruptly could put your recovery at risk. Relapse can have serious health consequences, and maintaining your treatment plan should be the priority [12].

Similarly, do not reduce your naltrexone dose on your own in an attempt to improve erectile function. Any changes to your medication regimen must be made under medical supervision. Your prescriber can help you weigh the benefits of naltrexone against any side effects you're experiencing and explore alternative approaches if needed.

Avoid self-medicating with erectile dysfunction tablets purchased from unregulated sources. While ED medications can be effective, they need to be prescribed safely after a proper assessment of your medical history and current medications. Some ED treatments may interact with other medicines you're taking, and a qualified prescriber needs to check that they're suitable for you. Cured Pharmacy offers a confidential online consultation with UK-registered prescribers who can assess your individual situation and recommend appropriate treatment if suitable.

Options to Discuss with Your Prescriber About Naltrexone Erectile Dysfunction

If you're experiencing erectile dysfunction while taking naltrexone, there are several options you can discuss with your prescriber. The first step is a thorough assessment to determine whether naltrexone is likely to be the cause, or whether other factors such as psychological stress, other medications, or underlying health conditions are contributing to the problem [1][2].

Your prescriber may suggest continuing naltrexone while addressing erectile dysfunction with other treatments, such as PDE5 inhibitor tablets (see below). In some cases, if the timing strongly suggests naltrexone is the cause and your recovery is stable, your prescriber might consider adjusting your treatment plan—for example, switching to a different medication for alcohol or opioid dependence, or trying a lower dose of naltrexone if clinically appropriate.

Lifestyle modifications can also play an important role in improving erectile function. Regular exercise, a healthy diet, reducing alcohol intake (if you're using naltrexone for alcohol reduction rather than complete abstinence), stopping smoking, and managing stress can all help improve erections [1]. Psychological support, such as counselling or sex therapy, may be beneficial if anxiety or relationship issues are contributing to the problem. Your prescriber can refer you to appropriate services if needed.

When to Seek Further Investigation

Erectile dysfunction can sometimes be an early warning sign of underlying health conditions such as cardiovascular disease or diabetes [1][2]. If you're experiencing new or worsening erectile problems, your GP may recommend blood tests to check for conditions such as diabetes, high cholesterol, low testosterone, or thyroid problems. Treating these underlying conditions can often improve erectile function and is important for your overall health.

At a glance

Can You Use ED Tablets with Naltrexone?

There is no known major interaction between naltrexone and PDE5 inhibitor medications such as sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra), or avanafil (Spedra). These erectile dysfunction tablets work by increasing blood flow to the penis in response to sexual stimulation, and they do not directly interact with naltrexone's mechanism of action at opioid receptors [3][4][5][6].

However, it's essential that any ED treatment is prescribed after a full assessment of your medical history and current medications. During an online consultation with Cured Pharmacy, a UK-registered prescriber will review all your current medicines, including naltrexone, to ensure that ED tablets are safe and suitable for you. They will also check for any other health conditions that might affect whether ED treatment is appropriate.

PDE5 inhibitors cannot be used with certain medications, including nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, or recreational drugs called 'poppers', as this combination can cause a dangerous drop in blood pressure [3][4]. If you're taking alpha-blockers for prostate symptoms or blood pressure medicines, special precautions may be needed. Your prescriber will check all these factors during your consultation to ensure ED tablets can be prescribed safely alongside naltrexone.

How ED Tablets Work

PDE5 inhibitors such as sildenafil, tadalafil, vardenafil, and avanafil work by relaxing blood vessels in the penis, allowing increased blood flow when you're sexually aroused. They do not cause an automatic erection—sexual stimulation is still needed. Sildenafil typically works within about an hour and lasts for around four to six hours. Tadalafil can last up to 36 hours, offering more spontaneity. Vardenafil and avanafil have similar onset times to sildenafil but may work slightly faster in some men [3][4][5][6]. Your prescriber can help you choose the most suitable option based on your preferences and lifestyle.

Getting Help for Naltrexone and Erectile Dysfunction

If you're experiencing erectile difficulties while taking naltrexone, the first step is to speak openly with your prescriber or GP. They can help determine the likely cause and discuss the best approach for your individual situation. Remember that erectile dysfunction is a common and treatable condition, and seeking help is a positive step [1][2].

Cured Pharmacy offers a discreet online consultation service for erectile dysfunction treatment. After completing a confidential health questionnaire, a UK-registered prescriber will review your information, including your use of naltrexone and any other medications, to assess whether ED tablets are suitable for you. If approved, your medication can be dispensed by our GPhC-registered pharmacy and delivered discreetly to your door.

Our service includes access to a range of ED treatments, from cost-effective generic options such as sildenafil and tadalafil to branded medications and newer alternatives. All prescriptions are issued only after a thorough clinical assessment to ensure safety and suitability. If ED tablets are not appropriate for you, or if your prescriber identifies any concerns that need further investigation, they will provide guidance on the next steps. You can also contact our pharmacy team if you have questions about your treatment or need support managing your medication.

In summary

• Naltrexone can cause erectile dysfunction in some men, though it is not a common side effect
• Never stop naltrexone without medical advice—your recovery treatment must continue safely
• ED tablets such as sildenafil and tadalafil can usually be used alongside naltrexone after assessment
• Erectile dysfunction often has multiple causes including psychological factors and underlying health conditions
• Speak to your prescriber to explore treatment options while maintaining your naltrexone therapy

Frequently Asked Questions