Vardenafil and Tenofovir: Can They Be Taken Together?

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Key takeaways

• Tenofovir itself does not interact with vardenafil, but other medicines in your HIV regimen may.
• Vardenafil is contraindicated with cobicistat and ritonavir; alternative ED treatments may be recommended.
• Always provide the full name of your HIV treatment during your online consultation.
• Continue your antiretroviral therapy exactly as prescribed; vardenafil does not affect HIV treatment.
• Seek urgent help if you have chest pain during sex or an erection lasting more than four hours.

What is vardenafil and how does it work?

Vardenafil is a prescription medicine used to treat erectile dysfunction (ED) in adult men. It is the generic version of the branded medicine Levitra and belongs to a group of medicines called PDE5 inhibitors [5].

Vardenafil works by relaxing the blood vessels in the penis, allowing more blood to flow into the area when you are sexually aroused. This helps you to achieve and maintain an erection suitable for sexual activity. It is important to understand that vardenafil does not work without sexual stimulation—it simply helps your body respond more effectively [5].

Vardenafil is usually taken about 25 to 60 minutes before sexual activity. The typical starting dose is 10 mg, which your prescriber may adjust to 5 mg or 20 mg depending on how well it works for you and whether you experience any side effects. You should not take vardenafil more than once a day [5].

What is tenofovir and why is it prescribed?

Tenofovir is an antiviral medicine used primarily to treat HIV infection and chronic hepatitis B. It belongs to a class of medicines called nucleotide reverse transcriptase inhibitors (NRTIs), which work by blocking an enzyme that HIV needs to replicate inside your cells [12].

Tenofovir is almost always prescribed as part of combination antiretroviral therapy (ART) for HIV, rather than on its own. Common combination tablets include tenofovir with emtricitabine (Truvada), or tenofovir with emtricitabine and other antiretroviral medicines such as efavirenz, rilpivirine, elvitegravir, or cobicistat [12].

Because tenofovir is usually given alongside other HIV medicines, it is essential to tell your prescriber the full name of your HIV treatment when you request ED medication. Some of the other medicines in your combination therapy may interact with vardenafil, even though tenofovir itself does not [12].

Common tenofovir-containing combination therapies

If you take a combination tablet, the other active ingredients matter. For example, tenofovir combined with cobicistat (found in medicines like Genvoya or Stribild) can significantly raise vardenafil levels in your blood, because cobicistat is a potent enzyme inhibitor. Similarly, tenofovir combined with ritonavir-boosted regimens can also affect how vardenafil is broken down in your body. Always provide the exact name of your HIV medication during your consultation [12].

At a glance

Does vardenafil interact with tenofovir directly?

Tenofovir on its own does not have a clinically significant interaction with vardenafil. Tenofovir does not inhibit or induce the liver enzymes (particularly CYP3A4) that break down vardenafil, so taking the two medicines together does not usually require a dose adjustment of vardenafil if tenofovir is the only other medicine you are taking [5][12].

However, as mentioned, tenofovir is rarely used alone. The other medicines in your HIV regimen may interact with vardenafil. For instance, ritonavir and cobicistat are potent CYP3A4 inhibitors and can significantly increase vardenafil levels, raising the risk of side effects such as headache, flushing, dizziness, or a prolonged drop in blood pressure. Vardenafil is contraindicated (must not be used) with potent CYP3A4 inhibitors [5].

This is why your prescriber will ask for the full details of your HIV treatment during the online consultation. They will check the Summary of Product Characteristics (SmPC) for your specific combination to determine whether vardenafil is suitable, or whether an alternative ED treatment such as sildenafil or tadalafil (which may have different interaction profiles) would be safer [3][4][5].

What does your prescriber check before prescribing vardenafil and tenofovir together?

When you complete an online consultation at Cured Pharmacy, the UK-registered prescriber will review your full medical history and current medicines. For someone taking tenofovir, the prescriber will specifically check the exact formulation and combination of your HIV therapy, because the other active ingredients may interact with vardenafil [5][12].

The prescriber will also assess your cardiovascular health. Both HIV and some antiretroviral medicines can affect heart health, and PDE5 inhibitors like vardenafil can lower blood pressure slightly. If you have a history of heart problems, very low blood pressure, or take medicines such as nitrates (GTN spray, isosorbide mononitrate), nicorandil, or riociguat, vardenafil is not safe and will not be prescribed [5].

Your prescriber will confirm that you are not taking another PDE5 inhibitor at the same time, as combining them (for example, vardenafil with sildenafil or tadalafil) can cause a dangerous drop in blood pressure. They will also check for any alpha-blocker medicines (such as doxazosin or tamsulosin) used for prostate symptoms, as these can add to the blood-pressure-lowering effect and require a lower starting dose of vardenafil [5].

Why the full name of your HIV medicine matters

Providing the exact brand or generic name of your HIV treatment is essential. For example, 'Truvada' (tenofovir plus emtricitabine) has a different interaction profile from 'Genvoya' (tenofovir alafenamide, emtricitabine, elvitegravir, and cobicistat). The prescriber uses this information to check the British National Formulary and SmPC to ensure vardenafil is safe for you, or to recommend an alternative ED treatment if needed [5][12].

Practical advice for taking vardenafil and tenofovir safely

If your prescriber confirms that vardenafil is suitable for you, take it exactly as directed. Vardenafil is usually taken about 25 to 60 minutes before you plan to have sex, and you should not take more than one dose in 24 hours. Swallow the tablet whole with water; you can take it with or without food, though a heavy, high-fat meal may delay how quickly it works [5].

Continue taking your tenofovir-based HIV treatment exactly as prescribed by your HIV specialist. Do not stop, skip, or change the dose of your antiretroviral therapy without consulting your HIV doctor, as this can lead to drug resistance and treatment failure. Vardenafil does not interfere with the antiviral activity of tenofovir [12].

Avoid drinking large amounts of alcohol when taking vardenafil, as alcohol can make erectile dysfunction worse and increase the risk of dizziness or low blood pressure. Grapefruit juice can raise vardenafil levels in your blood and should be avoided. Do not use recreational drugs known as 'poppers' (amyl or alkyl nitrites) with vardenafil, as this combination can cause a severe and dangerous drop in blood pressure [5].

If you experience side effects such as a severe headache, dizziness, chest pain during sex, or an erection lasting more than four hours, stop taking vardenafil and seek medical help immediately. Always inform any healthcare professional treating you that you take both tenofovir and vardenafil [5].

Are there alternative ED treatments if vardenafil is not suitable?

If your prescriber determines that vardenafil is not the best option due to interactions with other medicines in your HIV regimen, there are several alternative treatments for erectile dysfunction. Sildenafil (generic Viagra) and tadalafil (generic Cialis) are also PDE5 inhibitors, but they have slightly different interaction profiles and may be safer depending on your specific combination therapy [3][4].

Sildenafil is taken about one hour before sex and works for around four to six hours. 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 for continuous effect. Your prescriber will review the interactions of each option with your HIV medicines and recommend the safest and most effective choice for you [3][4].

Avanafil (Spedra) is another PDE5 inhibitor that works quickly (within 15 to 30 minutes), though it is also contraindicated with potent CYP3A4 inhibitors like ritonavir and cobicistat. Non-tablet options such as Vitaros (alprostadil cream applied to the tip of the penis) or Caverject (alprostadil injection) may be considered if oral treatments are unsuitable, though these require a separate prescription and specialist advice [6][7].

At Cured Pharmacy, all ED treatments require an online consultation reviewed by a UK-registered prescriber, who will tailor the recommendation to your individual health needs and current medicines. You can discuss your preferences and concerns during the consultation to find the treatment that works best for you.

When to see your GP about erectile dysfunction

If you are experiencing erectile dysfunction for the first time, it is important to see your GP for a face-to-face assessment. ED can be an early warning sign of underlying health conditions such as diabetes, high blood pressure, or cardiovascular disease, all of which are more common in people living with HIV. Your GP can arrange blood tests, review your overall health, and refer you to a specialist if needed [1][2].

When to get urgent help

• Erection lasting more than four hours (priapism) – go to A&E immediately
• Chest pain during or after sex – call 999 and do not take further doses
• Sudden loss of vision or hearing – stop vardenafil and seek urgent medical attention
• Severe dizziness or fainting – lie down, and contact 111 or your GP the same day

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

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