Vardenafil and Sofosbuvir: Can They Be Taken Together?

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Vardenafil and Sofosbuvir: Understanding the Interaction

Published: 4 November 2026

If you're considering vardenafil and sofosbuvir together, you'll want to know whether these medicines interact and what safety checks are needed. Vardenafil (generic Levitra) is a prescription treatment for erectile dysfunction (ED), while sofosbuvir is an antiviral medicine used to treat hepatitis C infection. This page explains what each medicine does, whether they can be taken together, and the practical steps your prescriber will take to ensure your safety.

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 does not cause an erection on its own—sexual stimulation is still needed for it to work [5].

The medicine is available in 5 mg, 10 mg, and 20 mg tablets, typically taken about 25 to 60 minutes before sexual activity [5]. The effect can last for several hours, but you should not take vardenafil more than once in 24 hours. Common side effects include headache, flushing, nasal congestion, and indigestion, which are usually mild and temporary [5].

Vardenafil is broken down in the body mainly by an enzyme system called CYP3A4 in the liver [5]. This means that medicines which affect this enzyme can alter how vardenafil works—either making it stronger (if the enzyme is blocked) or weaker (if the enzyme is sped up). Understanding this pathway is important when considering other medicines you may be taking.

What is sofosbuvir and why is it prescribed?

Sofosbuvir is a direct-acting antiviral medicine used to treat chronic hepatitis C virus (HCV) infection [12]. It is usually prescribed as part of a combination treatment regimen, often alongside other antivirals such as ledipasvir, velpatasvir, or ribavirin, depending on the genotype of the virus and your treatment history [12].

Sofosbuvir works by blocking a specific enzyme (called NS5B polymerase) that the hepatitis C virus needs to replicate inside liver cells [12]. By stopping the virus from copying itself, sofosbuvir helps your immune system clear the infection. Treatment courses typically last 12 to 24 weeks, and cure rates are high when the medicine is taken as prescribed [12].

Unlike some other hepatitis C medicines, sofosbuvir itself is not a strong inhibitor or inducer of the CYP3A4 enzyme system [12]. This means it is less likely to interfere with the breakdown of many other medicines, including vardenafil. However, sofosbuvir is often given in fixed-dose combination tablets with other antivirals, and those companion medicines may have their own interaction profiles that need checking.

Can vardenafil and sofosbuvir be taken together?

No major interaction between vardenafil and sofosbuvir is commonly reported in clinical guidance [5][12]. Sofosbuvir does not significantly affect the CYP3A4 enzyme that breaks down vardenafil, so taking the two medicines together is not expected to cause a dangerous rise or fall in vardenafil levels [12].

However, it is essential to tell your prescriber about every medicine you are taking, including your hepatitis C treatment. Sofosbuvir is often prescribed as part of a combination tablet—for example, with ledipasvir (Harvoni) or velpatasvir (Epclusa)—and these companion drugs may have different interaction profiles [12]. Your prescriber will check the specific combination you are on to ensure there are no concerns.

If you are also taking ribavirin alongside sofosbuvir, or if you have other health conditions such as heart disease or kidney problems, your prescriber will assess your overall treatment plan carefully. Erectile dysfunction can sometimes be linked to liver disease or the psychological impact of living with a chronic condition [1], so addressing ED as part of your wider health is important. Always complete your hepatitis C treatment as prescribed, and never stop or change any medicine without medical advice.

What your prescriber will check

During your online consultation at Cured Pharmacy, the prescriber will review your full medical history and current medicines. They will confirm the exact hepatitis C regimen you are on, check for any other medicines that might interact with vardenafil (such as nitrates, alpha-blockers, or potent CYP3A4 inhibitors), and ensure that your heart and liver health make vardenafil a safe choice [2][5]. If any adjustments are needed—such as starting on a lower dose—the prescriber will explain this clearly before approving your treatment.

Other medicines that interact with vardenafil and sofosbuvir

While vardenafil and sofosbuvir do not interact with each other in a clinically significant way, both medicines can interact with other drugs. For vardenafil, the most important interactions to avoid are with nitrates (such as GTN spray, isosorbide mononitrate), nicorandil, riociguat, and amyl/alkyl nitrites (poppers) [5]. Do not take vardenafil together with any of these medicines, as the combination can cause a dangerous drop in blood pressure [5].

Vardenafil is also affected by potent CYP3A4 inhibitors—medicines such as ritonavir, cobicistat, ketoconazole, itraconazole, and clarithromycin [5]. These drugs can significantly raise vardenafil levels in the blood, increasing the risk of side effects. In many cases, vardenafil is contraindicated or requires a much lower dose when used with potent inhibitors; your prescriber will check the Summary of Product Characteristics (SmPC) for your specific situation [5].

For sofosbuvir, important interactions include amiodarone (a heart rhythm medicine), which can cause serious slowing of the heart rate when taken with sofosbuvir-containing regimens [12]. Sofosbuvir may also interact with certain anticonvulsants, St John's wort, and rifampicin, which can reduce its effectiveness [12]. Your prescriber will review all your medicines—including over-the-counter products and herbal supplements—to ensure your hepatitis C treatment and ED medicine are both safe and effective.

Practical advice for taking vardenafil with hepatitis C treatment

If your prescriber approves vardenafil while you are on sofosbuvir-based hepatitis C treatment, take each medicine exactly as directed. Vardenafil is usually taken about 25 to 60 minutes before sexual activity, on an empty stomach or after a light meal, as a heavy or high-fat meal can delay its effect [5]. Do not take more than one dose in 24 hours [5].

Continue your hepatitis C treatment without interruption. Sofosbuvir is typically taken once daily with or without food, depending on the specific combination product [12]. Set a regular time each day to take your antiviral medicine, and do not miss doses, as this can allow the virus to develop resistance. If you experience any new or worsening symptoms—such as dizziness, chest pain, sudden vision changes, or an erection lasting more than four hours—seek medical help immediately [5].

Avoid drinking large amounts of alcohol, as this can worsen erectile dysfunction and increase the risk of side effects such as dizziness or low blood pressure [1][5]. Grapefruit juice may also raise vardenafil levels, so it is best avoided [5]. If you have any questions about timing your medicines or managing side effects, contact your prescriber or pharmacist for advice. Remember, erectile dysfunction is common and treatable, and addressing it can improve your quality of life while you complete your hepatitis C treatment [1].

When to contact your doctor

Contact your GP or specialist if you develop new symptoms such as unusual tiredness, yellowing of the skin or eyes, dark urine, or persistent nausea while on hepatitis C treatment, as these may indicate liver problems [12]. For vardenafil, seek urgent help if you experience chest pain during sex, sudden loss of vision or hearing, or an erection that lasts more than four hours (priapism) [5]. If you feel dizzy or faint after taking vardenafil, sit or lie down and avoid driving or operating machinery until you feel better [5].

How to get vardenafil and sofosbuvir safely in the UK

Sofosbuvir is a prescription-only medicine for hepatitis C, usually initiated and monitored by a specialist hepatology or infectious diseases team [12]. Your treatment will be closely supervised with regular blood tests to check your liver function and viral load. Do not stop or change your hepatitis C treatment without consulting your specialist, even if you feel well.

Vardenafil is also a prescription-only medicine, available through your GP or an online consultation with a UK-registered prescriber. At Cured Pharmacy (GPhC 9012511), you can request vardenafil by completing a confidential online health questionnaire. A UK prescriber will review your answers, check for interactions with your current medicines (including sofosbuvir), and approve treatment only if it is safe and suitable for you [2][5].

If approved, your vardenafil will be dispensed by our registered pharmacy team and delivered discreetly to your home. Prices start at £16.95 for vardenafil (generic Levitra), or £13.56 for your first order with code Ednew. We also offer other PDE5 inhibitors such as sildenafil (from £0.45, or £0.36 with code Ednew) and tadalafil (from £7.95, or £6.36 with code Ednew), which your prescriber may discuss as alternatives depending on your needs and medical history. All treatments require a prescriber review, and you should never buy prescription medicines without a valid prescription.

Why see a GP for new erectile dysfunction

If you are experiencing erectile dysfunction for the first time, it is important to see your GP for a full assessment [1][2]. ED can be an early warning sign of underlying health conditions such as heart disease, high blood pressure, diabetes, or high cholesterol [1]. Your GP can arrange blood tests, check your cardiovascular health, and refer you to a specialist if needed. Treating the underlying cause—alongside using ED medicines if appropriate—can improve both your sexual health and your overall wellbeing [2].

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 4 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 4 November 2026]
3. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 4 November 2026]
4. Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 4 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.