Vardenafil and Oseltamivir: Can You Take Them Together?
Learn about the interaction between these medicines and how our UK prescribers ensure your treatment is safe.
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Vardenafil and Oseltamivir: Understanding the Interaction
Published: 2 November 2026
Many men wonder whether vardenafil and oseltamivir can be taken together safely. Vardenafil (also known as Levitra) is a prescription medicine for erectile dysfunction, while oseltamivir (Tamiflu) is an antiviral used to treat or prevent influenza. The good news is that no major interaction between these two medicines is commonly reported, but your prescriber will still check your full medication list and health status during your consultation to ensure both treatments are suitable for you.
Key takeaways
- No major interaction is reported between vardenafil and oseltamivir—they work through different mechanisms.
- Always declare all medicines, including oseltamivir, during your online consultation.
- Flu symptoms may reduce your desire for sex; wait until you feel better if needed.
- Vardenafil must never be taken with nitrates, nicorandil, or riociguat—tell your prescriber about all treatments.
- Cured Pharmacy offers confidential, UK prescriber-led consultations for vardenafil and other ED treatments.
What Is Vardenafil and How Does It Work?
Vardenafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK to treat erectile dysfunction in adult men [5]. It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused. Vardenafil is available in 5 mg, 10 mg, and 20 mg tablets, and is usually taken about 25 to 60 minutes before sexual activity [5].
The medicine does not cause an erection on its own—sexual stimulation is still needed. Effects can last for several hours, but you should not take more than one dose in 24 hours [5]. Vardenafil is only available on prescription in the UK after a clinical assessment by a registered prescriber, who will check your medical history, current medicines, and cardiovascular health to ensure it is safe for you.
What Is Oseltamivir and When Is It Used?
Oseltamivir (commonly known by the brand name Tamiflu) is an antiviral medicine used to treat or prevent influenza (flu) in adults and children. It works by blocking the action of neuraminidase, an enzyme that the flu virus needs to spread from infected cells to healthy ones. By inhibiting this enzyme, oseltamivir can reduce the severity and duration of flu symptoms if started within 48 hours of symptom onset.
Oseltamivir is typically prescribed during flu season or during outbreaks, and is taken as a capsule or oral suspension. The usual treatment course is five days, though the dose and duration may vary depending on whether it is being used for treatment or prevention. Because oseltamivir targets the flu virus specifically, it does not interact with the mechanism of action of erectile dysfunction medicines like vardenafil.
At a glance
Do Vardenafil and Oseltamivir Interact With Each Other?
No major interaction between vardenafil and oseltamivir is commonly reported in clinical practice or the British National Formulary [5]. These two medicines work through completely different mechanisms in the body: vardenafil affects blood flow by inhibiting PDE5 in the penis, while oseltamivir blocks viral neuraminidase to prevent flu virus replication. Neither medicine is known to significantly affect the metabolism or effectiveness of the other.
However, it is still essential to tell your prescriber or pharmacist about all medicines you are taking, including oseltamivir, during your consultation. Your prescriber will review your full medication list and health conditions to ensure there are no other concerns. For example, if you are feeling unwell with flu, you may not feel like engaging in sexual activity, and your overall health status may affect whether vardenafil is appropriate at that time.
What Your Prescriber Will Check
During your online consultation at Cured Pharmacy, the prescriber will ask about all your current medicines, including oseltamivir, and any other health conditions. They will check that vardenafil is not contraindicated with any of your other treatments—particularly nitrates, nicorandil, riociguat, alpha-blockers, or medicines that strongly affect liver enzymes (such as some HIV medicines or antifungals) [5]. They will also assess your cardiovascular health, as sexual activity places demands on the heart. If you are acutely unwell with flu, the prescriber may advise waiting until you have recovered before using vardenafil.
Vardenafil and Oseltamivir: What the Evidence Shows
There are no published clinical trials or case reports documenting a harmful interaction between vardenafil and oseltamivir. The Summary of Product Characteristics for vardenafil lists specific medicines that interact—such as potent CYP3A4 inhibitors (e.g. ritonavir, ketoconazole, clarithromycin), nitrates, and alpha-blockers—but oseltamivir is not among them [12]. Oseltamivir is primarily eliminated by the kidneys and does not significantly inhibit or induce the liver enzymes that metabolise vardenafil.
That said, being unwell with influenza can affect your overall wellbeing, energy levels, and desire for sexual activity. Flu symptoms such as fever, muscle aches, and fatigue may make it less likely that you will want to use an erectile dysfunction treatment during the acute illness. It is always sensible to listen to your body and wait until you feel better before resuming normal activities, including sex.
Feeling Unwell? It's OK to Wait
If you have the flu, it is perfectly fine to pause using vardenafil until you feel better. Your body needs rest, and your usual sexual function will return once you have recovered.
Practical Advice: Taking Vardenafil While on Oseltamivir
If you have been prescribed oseltamivir for flu and you also use vardenafil for erectile dysfunction, you can generally continue both medicines as directed, provided your prescriber is aware of both treatments. Take each medicine exactly as prescribed: oseltamivir with or without food (though taking it with food may reduce nausea), and vardenafil about 25 to 60 minutes before planned sexual activity on an empty stomach or after a light meal (a heavy, high-fat meal can delay its effect) [5].
Remember that vardenafil will only work if you are sexually aroused, and if you are feeling unwell with flu, you may not be in the mood for sex. There is no harm in waiting a few days until you have recovered. Stay well hydrated, get plenty of rest, and avoid heavy alcohol, which can worsen both flu symptoms and erectile function. If you experience any unexpected side effects or have concerns, contact your GP or pharmacist for advice.
When to Seek Further Advice
If you develop new symptoms while taking vardenafil and oseltamivir together—such as severe dizziness, chest pain, sudden vision or hearing loss, or an erection lasting more than four hours—seek urgent medical help. These are rare but serious side effects of vardenafil that require immediate attention [5]. If your flu symptoms worsen or do not improve after a few days on oseltamivir, contact your GP, as you may need further assessment or a different treatment.
How to Get Vardenafil Safely at Cured Pharmacy
Vardenafil is a prescription-only medicine in the UK, which means you need a clinical assessment by a registered prescriber before it can be supplied [5]. At Cured Pharmacy, the process is straightforward and confidential: you complete an online consultation form detailing your medical history, current medicines (including oseltamivir if you are taking it), and any health conditions. A UK-registered prescriber reviews your answers and, if appropriate, approves your prescription.
If vardenafil is not suitable for you, the prescriber may suggest an alternative PDE5 inhibitor such as sildenafil or tadalafil, or recommend that you see your GP for further investigation. Erectile dysfunction can be an early warning sign of cardiovascular disease or diabetes, so it is important to have a full health check if ED is new or worsening [1][2]. Once your prescription is approved, your medicine is dispensed by our GPhC-registered pharmacy and delivered discreetly to your door, usually within a few days.
Why Declare All Your Medicines
Even though vardenafil and oseltamivir do not interact significantly, it is vital to declare every medicine you take—prescription, over-the-counter, herbal, or recreational—during your consultation. Some combinations can be dangerous: for example, vardenafil must never be taken with nitrates (such as GTN spray), nicorandil, riociguat, or poppers, as this can cause a life-threatening drop in blood pressure [5]. Your prescriber needs the full picture to keep you safe and ensure the treatment is effective.
When to get urgent help
- Erection lasting more than 4 hours (priapism)—go to A&E immediately
- Sudden loss of vision or hearing—stop vardenafil and seek urgent medical help
- Chest pain during or after sex—call 999 and do not take another dose
- Severe dizziness or fainting after taking vardenafil—seek same-day medical advice
- Worsening flu symptoms or difficulty breathing—contact your GP or call 111
Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.
Scientific References
- NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 2 November 2026]
- National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 2 November 2026]
- Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 2 November 2026]
- Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 2 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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Your Questions Answered
Can't find your answer? Our UK pharmacists review every consultation and can help.
Can I take vardenafil and oseltamivir at the same time?
Yes, no major interaction is reported between these two medicines. However, always tell your prescriber about all medicines you are taking, including oseltamivir, so they can review your full treatment plan.
Will oseltamivir (Tamiflu) affect how well vardenafil works?
No, oseltamivir does not interfere with the way vardenafil works. They act through completely different mechanisms and are not known to reduce each other's effectiveness.
Should I avoid sex while I have the flu?
There is no medical reason you cannot have sex if you feel well enough, but flu symptoms such as fever and fatigue often mean you will not feel like it. Listen to your body and rest until you have recovered.
What should I tell my prescriber about my flu treatment?
Mention that you are taking oseltamivir, how long you have been on it, and any other medicines or supplements you are using. This helps the prescriber assess whether vardenafil is safe and appropriate for you.
Can I take paracetamol or ibuprofen with vardenafil and oseltamivir?
Yes, paracetamol and ibuprofen do not interact with vardenafil or oseltamivir. Follow the dosing instructions on the packet and do not exceed the recommended dose.
Does having the flu make erectile dysfunction worse?
Acute illness, fever, and fatigue can temporarily reduce libido and sexual function. Once you recover from the flu, your usual erectile function should return.
How long does oseltamivir stay in my system?
Oseltamivir is eliminated fairly quickly, with most of the dose cleared within 24 hours. A typical treatment course is five days, after which the medicine will be out of your system within a day or two.
What if I get side effects from vardenafil while taking oseltamivir?
Common vardenafil side effects include headache, flushing, and nasal congestion, which can overlap with flu symptoms. If you experience severe dizziness, chest pain, sudden vision or hearing loss, or an erection lasting more than four hours, seek urgent medical help.
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