Vardenafil and Nalmefene: Can You Take Them Together?

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What Is Vardenafil and How Does It Work?

Vardenafil (generic Levitra) is a prescription medicine licensed in the UK to treat erectile dysfunction in adult men [5]. It belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors, which work by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused [5].

Vardenafil is usually taken about 25 to 60 minutes before sexual activity, and its effect can last for several hours [5]. It is available in 5 mg, 10 mg, and 20 mg tablets, and the usual starting dose is 10 mg, adjusted according to response and tolerability [5]. Vardenafil will only work when you are sexually stimulated; it does not cause an automatic erection and it does not cure ED [5].

Like all PDE5 inhibitors, vardenafil can interact with other medicines, particularly those that affect blood pressure or are metabolised by the same liver enzymes [5]. Your prescriber will check your full medication list and medical history before prescribing vardenafil to ensure it is safe and appropriate for you.

What Is Nalmefene and Why Is It Prescribed?

Nalmefene is a prescription medicine used to help reduce alcohol consumption in adults with alcohol dependence who have a high drinking risk level, do not have physical withdrawal symptoms, and do not require immediate detoxification [12]. It works by modulating the brain's opioid receptors, which are involved in the reward and craving pathways associated with alcohol use.

Nalmefene is taken on an 'as-needed' basis, usually one tablet (18 mg) each day you perceive a risk of drinking alcohol, preferably 1–2 hours before the anticipated time of drinking [12]. It is part of a comprehensive treatment plan that includes psychosocial support to help you reduce your alcohol intake.

Because alcohol itself can worsen erectile dysfunction and interact with ED medicines, nalmefene may indirectly support better sexual health by helping you reduce heavy drinking [1]. However, nalmefene is not an ED treatment and does not directly affect erectile function. If you are taking nalmefene and also experience ED, your prescriber will assess both conditions separately and check for any potential interactions with ED medicines such as vardenafil.

When to get urgent help

• Erection lasting more than four hours (priapism)—go to A&E immediately
• Sudden loss of vision or hearing—seek emergency medical help
• Chest pain during or after sexual activity—call 999
• Severe dizziness, fainting, or feeling very unwell after taking vardenafil—seek medical advice promptly

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

Do Vardenafil and Nalmefene Interact?

No major direct pharmacological interaction between vardenafil and nalmefene is commonly reported in UK clinical guidance or the British National Formulary [5][12]. This means that the two medicines do not typically interfere with each other's metabolism or mechanism of action in a way that would make the combination unsafe for most people.

However, both medicines can have effects on your cardiovascular system. Vardenafil can lower blood pressure slightly, especially when combined with alcohol or other blood-pressure-lowering medicines [5]. Nalmefene itself does not usually cause significant blood pressure changes, but it is prescribed to people with alcohol dependence, and heavy alcohol use is known to worsen erectile dysfunction and can add to the blood-pressure-lowering effect of vardenafil [1][5].

Your prescriber will review your full medical history, current medications, and alcohol consumption during your consultation. They will check that vardenafil is suitable for you and that there are no other medicines or health conditions that could cause problems when combined with either vardenafil or nalmefene. You should always declare all your current medicines, including over-the-counter products and supplements, during your online consultation.

Why Your Prescriber Checks Your Full Medication List

Even when two medicines do not have a major direct interaction, your prescriber must consider the bigger picture. For example, if you are taking other medicines for high blood pressure, heart conditions, or mental health, these may interact with vardenafil [5]. Similarly, if you have liver or kidney problems, the dose of vardenafil may need to be adjusted [5].

Your prescriber will also ask about your alcohol consumption. If you are taking nalmefene, it suggests you are working to reduce heavy drinking, which is positive for your overall health and your sexual function [1]. Reducing alcohol intake can improve erectile dysfunction and reduce the risk of side effects such as dizziness or low blood pressure when taking vardenafil [1][5].

What Your Prescriber Will Check Before Prescribing Vardenafil and Nalmefene

Before prescribing vardenafil, your prescriber will ask about your cardiovascular health, including any history of heart attack, stroke, angina, heart failure, or abnormal heart rhythms [5]. Vardenafil is not suitable if sexual activity is inadvisable due to your heart condition, or if you have very low blood pressure or uncontrolled high blood pressure [5].

They will also check for medicines that must never be taken with vardenafil, including nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, and recreational drugs called 'poppers' (amyl or alkyl nitrites) [5]. Combining vardenafil with any of these can cause a dangerous drop in blood pressure [5]. Do not take vardenafil with another PDE5 inhibitor (such as sildenafil or tadalafil) at the same time [5].

Your prescriber will ask about other medicines that can interact with vardenafil, including alpha-blockers (such as tamsulosin or doxazosin), potent CYP3A4 inhibitors (such as ritonavir, ketoconazole, or clarithromycin), and other blood-pressure medicines [5]. If you are taking nalmefene, they will discuss your alcohol use and overall health to ensure vardenafil is safe and appropriate for you. All prescription medicines at Cured Pharmacy are only supplied after an online consultation reviewed by a UK-registered prescriber.

At a glance

Practical Advice for Taking Vardenafil and Nalmefene Safely

If your prescriber approves vardenafil for you and you are also taking nalmefene, follow the dosing instructions for each medicine carefully. Take vardenafil about 25 to 60 minutes before you plan to have sex, and only once in any 24-hour period [5]. Take nalmefene as directed, usually on days when you perceive a risk of drinking alcohol, preferably 1–2 hours before you might drink [12].

Limit your alcohol intake. Heavy drinking can worsen erectile dysfunction, reduce the effectiveness of vardenafil, and increase the risk of side effects such as dizziness, headache, or low blood pressure [1][5]. Nalmefene is designed to help you reduce your alcohol consumption, which will benefit both your sexual health and your overall wellbeing [1].

Avoid grapefruit juice while taking vardenafil, as it can raise the level of the medicine in your blood and increase the risk of side effects [5]. Do not take vardenafil if you are using nitrates, nicorandil, riociguat, poppers, or another PDE5 inhibitor [5]. If you develop any new symptoms or side effects, or if you start any new medicines (including over-the-counter or herbal products), speak to your prescriber or pharmacist promptly.

When to Seek Urgent Medical Help

Seek emergency medical help (call 999 or go to A&E) if you experience an erection lasting more than four hours (priapism), sudden loss of vision or hearing, or chest pain during sexual activity [5]. These are rare but serious side effects that require immediate treatment.

If you feel very dizzy, faint, or unwell after taking vardenafil, especially if you have also drunk alcohol, sit or lie down and seek medical advice [5]. Do not drive or operate machinery if you feel dizzy or lightheaded.

Other Medicines and Lifestyle Factors That Affect Vardenafil and Nalmefene

Several other medicines can interact with vardenafil. Alpha-blockers (used for prostate problems or high blood pressure) can cause a significant drop in blood pressure when combined with vardenafil [5]. If you take an alpha-blocker, you should be stable on that medicine and start vardenafil at the lowest dose, with careful monitoring [5].

Potent CYP3A4 inhibitors, such as ritonavir, cobicistat (found in some HIV medicines), ketoconazole, itraconazole, and clarithromycin, can raise vardenafil levels in your blood [5]. Vardenafil is contraindicated or requires dose adjustment with these medicines, so your prescriber must check the summary of product characteristics (SmPC) and your full medication list [5]. CYP3A4 inducers, such as rifampicin, carbamazepine, phenytoin, and St John's wort, can make vardenafil less effective [5].

Nalmefene does not have the same enzyme-based interactions as vardenafil, but it should be used with caution in people with severe liver or kidney disease [12]. If you are taking other medicines for mental health, pain, or other conditions, declare them during your consultation so your prescriber can check for any potential interactions. Lifestyle changes such as reducing alcohol, stopping smoking, eating a balanced diet, exercising regularly, and managing stress can all improve erectile dysfunction and support the effectiveness of vardenafil [1][2].

Why Reducing Alcohol Helps Erectile Dysfunction

Heavy alcohol consumption is a common cause of erectile dysfunction [1]. Alcohol is a depressant that can reduce sexual arousal, delay orgasm, and interfere with the nerve signals and blood flow needed for an erection [1]. Long-term heavy drinking can also damage blood vessels and nerves, and contribute to conditions such as high blood pressure, diabetes, and liver disease, all of which can worsen ED [1].

If you are taking nalmefene to reduce your alcohol intake, you are taking an important step to improve your sexual health and overall wellbeing [1]. Many men find that cutting down on alcohol leads to better erections, more energy, and improved mood. Combining reduced alcohol with an effective ED treatment such as vardenafil can help you regain confidence and enjoy a satisfying sex life.

In summary

• No major direct interaction between vardenafil and nalmefene is commonly reported in UK clinical guidance.
• Your prescriber will review your full medication list, cardiovascular health, and alcohol use before prescribing vardenafil.
• Never take vardenafil with nitrates, nicorandil, riociguat, poppers, or another PDE5 inhibitor.
• Reducing alcohol with nalmefene can improve erectile dysfunction and reduce side effects from vardenafil.
• Seek emergency help if you have an erection lasting over four hours or sudden vision or hearing loss.

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