Vardenafil and Levetiracetam: Can They Be Taken Together?

Vardenafil and Levetiracetam: Understanding the Interaction

Published: 1 November 2026

If you take levetiracetam (Keppra) for epilepsy and are considering vardenafil (generic Levitra) for erectile dysfunction, you may be wondering whether vardenafil and levetiracetam can be taken together safely. The good news is that no major direct interaction between these two medicines is commonly reported in clinical practice. However, your prescriber will still review your full medical history and all current medicines during your consultation to ensure vardenafil is suitable for you, as individual circumstances vary.

What Is Vardenafil and Levetiracetam?

Vardenafil is a prescription medicine used to treat erectile dysfunction (ED) in adult men. It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused [3][5]. Vardenafil is available in 5 mg, 10 mg, and 20 mg tablets and is usually taken about 25 to 60 minutes before sexual activity. It does not work without sexual stimulation and should not be taken more than once a day.

Levetiracetam is an antiepileptic (anti-seizure) medicine commonly prescribed to control epilepsy. It is sold under the brand name Keppra, among others, and works by stabilising electrical activity in the brain to prevent seizures. Levetiracetam is usually taken once or twice daily as a long-term treatment. It is important to take it exactly as prescribed by your doctor, as stopping suddenly can increase the risk of seizures.

Both medicines are prescription-only and should only be used under the guidance of a healthcare professional. If you are taking levetiracetam and are considering treatment for ED, your prescriber will review your epilepsy control, overall health, and any other medicines you take to ensure vardenafil is safe and appropriate for you.

Do Vardenafil and Levetiracetam Interact?

Based on current evidence, there is no well-documented direct interaction between vardenafil and levetiracetam. These medicines work in different ways and are processed by the body through different pathways. Levetiracetam is not known to significantly affect the liver enzymes (such as CYP3A4) that break down vardenafil, so it is unlikely to alter vardenafil levels in your bloodstream [5].

However, this does not mean the combination is automatically suitable for everyone. Your prescriber will still need to check your full medical history, including your epilepsy control, any other medicines you take, and any other health conditions you have. For example, if you take other medicines alongside levetiracetam—such as blood pressure tablets or other antiepileptics—those may have interactions with vardenafil that need to be considered.

It is also important to remember that erectile dysfunction can sometimes be linked to underlying health conditions, such as cardiovascular disease or diabetes, which may also affect your suitability for vardenafil [1][2]. Your prescriber will assess all these factors during your consultation to ensure the treatment is safe and effective for you.

How Vardenafil Works in the Body

Vardenafil is broken down mainly by the liver enzyme CYP3A4. Medicines that strongly inhibit this enzyme (such as ritonavir, ketoconazole, or clarithromycin) can raise vardenafil levels and increase the risk of side effects. Conversely, medicines that induce CYP3A4 (such as rifampicin, carbamazepine, phenytoin, or St John's wort) can lower vardenafil levels and reduce its effectiveness [5]. Levetiracetam does not significantly affect CYP3A4, which is why no major interaction is expected. However, if you take other antiepileptic medicines alongside levetiracetam, your prescriber will check whether those medicines interact with vardenafil.

What Your Prescriber Checks Before Prescribing Vardenafil

Before prescribing vardenafil, your prescriber will ask about your current medicines, including levetiracetam and any other antiepileptics, to check for potential interactions. They will also ask about your epilepsy control and whether you have had any recent seizures, as uncontrolled epilepsy or frequent seizures may affect your overall suitability for sexual activity.

Your prescriber will review your cardiovascular health, as vardenafil can lower blood pressure slightly. They will ask whether you have any heart conditions, have had a recent heart attack or stroke, or take medicines for angina (such as nitrates or nicorandil). Vardenafil must never be taken with nitrates, nicorandil, riociguat, or recreational drugs called 'poppers', as the combination can cause a dangerous drop in blood pressure [5].

You will also be asked about other medicines that can interact with vardenafil, such as alpha-blockers (for prostate or blood pressure), potent CYP3A4 inhibitors, or other blood pressure medicines. If you take any of these, your prescriber may adjust the dose of vardenafil or recommend a different ED treatment. Finally, they will check whether you have any conditions that make vardenafil unsuitable, such as severe liver or kidney disease, a history of priapism (prolonged erection), or previous sudden vision loss (NAION) [5].

Practical Advice for Taking Vardenafil with Levetiracetam

If your prescriber confirms that vardenafil is suitable for you, take it exactly as directed. The usual starting dose is 10 mg, taken about 25 to 60 minutes before sexual activity. Depending on how well it works and whether you experience any side effects, your prescriber may adjust the dose to 5 mg or 20 mg. Do not take vardenafil more than once in 24 hours [5].

Continue taking your levetiracetam exactly as prescribed by your doctor. Do not stop or change the dose of levetiracetam without medical advice, as this can increase your risk of seizures. If you experience any new or unusual symptoms after starting vardenafil, such as dizziness, headache, or changes in vision, contact your prescriber or pharmacist for advice.

Avoid drinking large amounts of alcohol when taking vardenafil, as alcohol can worsen erectile dysfunction and increase the risk of side effects such as dizziness or low blood pressure. Grapefruit juice can also raise vardenafil levels in your blood, so it is best to avoid it. If you take any new medicines (prescribed or over-the-counter) while using vardenafil, check with your pharmacist or prescriber to ensure there are no interactions.

What to Do If You Take Other Antiepileptic Medicines

If you take other antiepileptic medicines alongside levetiracetam, it is especially important to declare them during your consultation. Some antiepileptics, such as carbamazepine and phenytoin, are CYP3A4 inducers and can reduce the effectiveness of vardenafil [5]. Your prescriber will review your full medication list and may recommend a different ED treatment or adjust the dose if needed. Never stop or change your epilepsy medicines without advice from your doctor.

Warning Signs and When to Seek Help with Vardenafil and Levetiracetam

Most men tolerate vardenafil well, but like all medicines, it can cause side effects. Common side effects include headache, flushing, nasal congestion, and indigestion. These are usually mild and go away on their own. If you experience dizziness or feel faint, sit or lie down until you feel better, and avoid driving or operating machinery [5].

Seek urgent medical help if you develop an erection that lasts longer than four hours (priapism), as this can cause permanent damage to the penis. You should also seek immediate help if you experience sudden loss of vision or hearing, chest pain during sex, or signs of an allergic reaction (such as swelling of the face, lips, or throat, or difficulty breathing) [5].

If you notice any change in your seizure frequency or control after starting vardenafil, contact your doctor as soon as possible. While vardenafil is not expected to affect epilepsy directly, any new medicine should be monitored carefully. If you have any concerns about taking vardenafil with levetiracetam, speak to your prescriber or pharmacist for personalised advice.

Other ED Treatments Available at Cured Pharmacy

If vardenafil is not suitable for you, or if you would like to try a different PDE5 inhibitor, Cured Pharmacy offers a range of licensed ED treatments. Sildenafil (generic Viagra) is available from £0.45 per tablet (£0.36 with code Ednew on your first order) and is taken about one hour before sex. Tadalafil (generic Cialis) is available from £7.95 (£6.36 with code Ednew) and can last up to 36 hours, offering more flexibility [3][4].

Other options include avanafil (Spedra), which works in as little as 15 to 30 minutes, and branded versions such as Viagra and Cialis. All PDE5 inhibitors work in a similar way and have similar interactions, so if vardenafil is safe for you, other PDE5 inhibitors are likely to be safe as well. However, you should only take one PDE5 inhibitor at a time, and never combine them [3][4][5][6].

All ED treatments at Cured Pharmacy require an online consultation, which is reviewed by a UK-registered prescriber. The prescriber will check your medical history, current medicines (including levetiracetam), and overall health to ensure the treatment is safe and appropriate for you. If you have any questions about which ED treatment is best for you, our pharmacy team is here to help.

When to See Your GP About Erectile Dysfunction

If you are experiencing erectile dysfunction for the first time, it is a good idea to see your GP. ED can be an early warning sign of underlying health conditions such as heart disease, high blood pressure, or diabetes [1][2]. Your GP can carry out tests to check your overall health and may refer you to a specialist if needed. Treating any underlying condition can often improve erectile function as well as your general health.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 1 November 2026]
2. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 1 November 2026]
3. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 1 November 2026]
4. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 1 November 2026]
5. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 1 November 2026]
6. Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 1 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.