Vardenafil and Exenatide: Can They Be Taken Together?

Available Treatments

Pricing Disclaimer: Prices on some pages may not be up to date — the live pricing table below and pricing shown during consultation are official current prices and take precedence over any other figures on the site.

Vardenafil and Exenatide: What You Need to Know

Published: 30 October 2026

Many men taking exenatide for type 2 diabetes wonder whether vardenafil and exenatide can be used together safely. The good news is that no major direct interaction between these two medicines is commonly reported, but your prescriber will still check your overall health, blood pressure, and heart function before approving vardenafil. This page explains what each medicine does, how they work in your body, and the practical steps to use them safely.

What is vardenafil and how does it work?

Vardenafil (also known by the brand name Levitra) is a prescription medicine used to treat erectile dysfunction in men [5]. It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis, allowing more blood to flow in when you are sexually aroused. This increased blood flow helps you get and keep an erection suitable for sexual activity.

Vardenafil is usually taken about 25 to 60 minutes before sex, and its effects can last for several hours [5]. It comes in 5 mg, 10 mg, and 20 mg tablets. The medicine does not cause an erection on its own—you still need sexual stimulation for it to work. Common side effects include headache, flushing, nasal congestion, and indigestion, which are usually mild and temporary.

What is exenatide and why is it prescribed?

Exenatide (brand names Byetta and Bydureon) is an injectable medicine used to treat type 2 diabetes. It belongs to a class of drugs called GLP-1 receptor agonists, which help to lower blood sugar levels by increasing insulin release when glucose is high, slowing stomach emptying, and reducing appetite. Exenatide is often prescribed when diet, exercise, and other diabetes tablets have not controlled blood sugar levels well enough.

Because type 2 diabetes is a common cause of erectile dysfunction, many men taking exenatide may also need treatment for ED [1]. Diabetes can damage blood vessels and nerves over time, making it harder to achieve or maintain an erection. Managing your diabetes well—through medication, diet, and lifestyle—can help improve ED symptoms, but many men still benefit from additional ED treatment such as vardenafil.

The link between diabetes and erectile dysfunction

Men with diabetes are up to three times more likely to experience erectile dysfunction than men without diabetes [1]. High blood sugar levels over time can damage the small blood vessels and nerves that control erections. Good diabetes control, regular exercise, maintaining a healthy weight, and not smoking can all reduce the risk of ED and improve your response to treatment.

Is there an interaction between vardenafil and exenatide?

No major direct interaction between vardenafil and exenatide is commonly reported in clinical practice. These two medicines work on different systems in the body: vardenafil affects blood flow to the penis, while exenatide regulates blood sugar and insulin. They are not known to interfere with each other's effectiveness or significantly increase the risk of side effects when used together.

However, your prescriber will still carry out a full medical review before approving vardenafil. This is because men with type 2 diabetes often have other health conditions—such as high blood pressure, high cholesterol, or heart disease—that can affect whether ED treatment is safe for you [2]. Your prescriber will check your current medicines, blood pressure, and cardiovascular health to ensure vardenafil is suitable. Always declare all your medicines, including exenatide, during your consultation.

What does your prescriber check before approving vardenafil and exenatide together?

During your online consultation at Cured Pharmacy, the prescriber will review your full medical history and current medication list. They will check whether you have any conditions that make vardenafil unsuitable, such as recent heart attack or stroke, unstable angina, severe heart failure, very low blood pressure, or a history of sudden vision loss (NAION) [5]. They will also ask about other medicines you take, because some drugs can interact dangerously with vardenafil.

In particular, the prescriber will confirm you are not taking nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, or recreational drugs called 'poppers' (amyl or alkyl nitrites). Do not take vardenafil together with any of these medicines, as the combination can cause a dangerous drop in blood pressure [5]. If you take alpha-blockers (such as tamsulosin or doxazosin) for prostate symptoms, you should be stable on that treatment and start vardenafil at the lowest dose, as there is a risk of dizziness or low blood pressure.

Other medicines that can affect vardenafil

Certain medicines that affect liver enzymes can raise or lower vardenafil levels in your blood. Potent CYP3A4 inhibitors—such as ritonavir, cobicistat, ketoconazole, itraconazole, and clarithromycin—can increase vardenafil levels, and vardenafil is usually avoided or contraindicated with these drugs [5]. CYP3A4 inducers, such as rifampicin, carbamazepine, phenytoin, and St John's wort, can reduce vardenafil's effectiveness. Your prescriber will check every medicine you are taking to identify any potential interactions.

Practical advice for using vardenafil and exenatide safely

If your prescriber approves vardenafil, take it as directed—usually about 25 to 60 minutes before sexual activity, and no more than once a day [5]. You can take vardenafil with or without food, though a heavy, high-fat meal may delay how quickly it works. Continue taking your exenatide exactly as prescribed by your diabetes team; do not stop or change your diabetes treatment without medical advice.

Monitor your blood sugar levels regularly, especially if you are adjusting your diet or activity levels. Avoid drinking large amounts of alcohol, as heavy drinking can worsen erectile dysfunction and add to the blood-pressure-lowering effect of vardenafil, increasing the risk of dizziness or fainting. Grapefruit juice can also raise vardenafil levels in your blood, so it is best to avoid it while using this medicine.

If you experience side effects such as severe headache, dizziness, chest pain during sex, or an erection lasting more than four hours, seek medical help immediately. If you notice sudden loss of vision or hearing, stop taking vardenafil and contact a doctor urgently. Keep both your diabetes team and your ED prescriber informed of any changes in your health or medication.

How Cured Pharmacy can help with vardenafil and exenatide

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering a convenient, confidential service for men who need erectile dysfunction treatment. Our online consultation is reviewed by a UK-registered prescriber, who will check your medical history, current medicines (including exenatide), and overall health before approving vardenafil or another suitable ED treatment.

We stock a range of licensed ED medicines, including vardenafil (generic Levitra) at £16.95 (first order with code Ednew: £13.56), as well as sildenafil, tadalafil, and avanafil. If vardenafil is not suitable for you, the prescriber may recommend an alternative PDE5 inhibitor. All our treatments are dispensed by qualified pharmacists and delivered discreetly to your door. If you have any questions about using vardenafil alongside your diabetes medication, our pharmacy team is here to help.

When to see your GP

If you are experiencing erectile dysfunction for the first time, it is important to see your GP for a full assessment [1]. ED can be an early warning sign of heart disease, high blood pressure, or poorly controlled diabetes. Your GP can arrange blood tests, review your diabetes management, and refer you to a specialist if needed. Online ED services like Cured Pharmacy are a convenient option for ongoing treatment, but they work best alongside regular GP care.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 30 October 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 30 October 2026]
3. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 30 October 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.