Vardenafil and Cabergoline: Can They Be Taken Together?

Vardenafil and Cabergoline: Understanding the Interaction

Published: 28 October 2026

If you've been prescribed vardenafil and cabergoline, you may be wondering whether it's safe to take them together. The good news is that no major direct interaction is commonly reported between vardenafil (a PDE5 inhibitor used for erectile dysfunction) and cabergoline (a dopamine agonist used for conditions such as high prolactin levels or Parkinson's disease). However, both medicines can lower blood pressure, so your prescriber will carefully assess your individual circumstances before confirming the combination is suitable for you.

What Is Vardenafil and How Does It Work?

Vardenafil is the active ingredient in Levitra, a prescription medicine licensed in the UK to treat erectile dysfunction (ED) [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're sexually aroused. This helps you get and keep an erection suitable for sexual activity [1].

Vardenafil is available in 5 mg, 10 mg and 20 mg tablets. You take it about 25 to 60 minutes before sex, and the effect can last for several hours [5]. It only works when you're sexually stimulated—it won't cause an erection on its own. Like all PDE5 inhibitors, vardenafil can lower blood pressure slightly, which is usually not a problem but becomes important when combined with other medicines that also affect blood pressure [5].

What Is Cabergoline and Why Is It Prescribed?

Cabergoline is a dopamine agonist, meaning it mimics the action of dopamine in the brain. It's most commonly prescribed to treat conditions caused by high levels of the hormone prolactin (hyperprolactinaemia), such as irregular periods, infertility or unwanted breast milk production. It's also used in the management of Parkinson's disease and sometimes to stop breast milk production after childbirth [12].

Cabergoline works by stimulating dopamine receptors, which in turn reduces prolactin secretion from the pituitary gland. High prolactin levels can contribute to erectile dysfunction in men, so treating the underlying hormonal imbalance with cabergoline may actually improve sexual function [2]. However, cabergoline itself can cause side effects including dizziness and low blood pressure, particularly when you first start taking it or when the dose is increased [12].

How Cabergoline May Affect Erectile Function

Elevated prolactin can suppress testosterone and interfere with sexual desire and erectile function. By lowering prolactin levels, cabergoline may help restore normal sexual function in men whose ED is related to hyperprolactinaemia [2]. Some men notice an improvement in libido and erections once their prolactin levels are controlled. However, if ED persists despite normal prolactin, a PDE5 inhibitor such as vardenafil may be prescribed alongside cabergoline to provide additional support.

Do Vardenafil and Cabergoline Interact?

There is no well-documented direct pharmacological interaction between vardenafil and cabergoline—they work through different mechanisms and are not known to interfere with each other's metabolism or effectiveness [5][12]. This means that, in principle, the two medicines can be prescribed together when clinically appropriate.

However, both medicines can lower blood pressure. Vardenafil does so by dilating blood vessels, and cabergoline can cause postural hypotension (a drop in blood pressure when you stand up), especially at the start of treatment [5][12]. When taken together, there is a theoretical risk that the blood-pressure-lowering effects could add up, leading to dizziness, light-headedness or fainting. This is why your prescriber will carefully review your medical history, current blood pressure and any other medicines you take before confirming that the combination is safe for you.

It's important to declare all your current medicines—including over-the-counter products and supplements—during your consultation. Your prescriber will check for any additional interactions and ensure that the doses of both vardenafil and cabergoline are appropriate for your individual situation [2].

What Your Prescriber Will Check Before Approving Vardenafil and Cabergoline

Before prescribing vardenafil alongside cabergoline, your prescriber will ask about your cardiovascular health, including any history of heart disease, stroke, low blood pressure or fainting episodes. They will also want to know about all other medicines you take, particularly those that affect blood pressure (such as alpha-blockers, antihypertensives or other vasodilators) [2][5].

Your prescriber will check that you are not taking any medicines that are contraindicated with vardenafil, such as nitrates (GTN spray, isosorbide mononitrate), nicorandil, riociguat or recreational drugs known as 'poppers' (amyl or alkyl nitrites). Combining vardenafil with any of these can cause a dangerous drop in blood pressure and must be avoided [5]. They will also review whether you are on any potent CYP3A4 inhibitors (such as ritonavir, ketoconazole or clarithromycin), as these can raise vardenafil levels and increase the risk of side effects; vardenafil is often contraindicated or requires dose adjustment in these cases [5].

If you are stable on cabergoline with no significant blood-pressure problems, and your prescriber is satisfied that your cardiovascular system can tolerate the modest additional blood-pressure-lowering effect of vardenafil, they may approve the combination—often starting you on the lowest effective dose of vardenafil to minimise risk [2][5].

Starting on a Lower Dose

When prescribing vardenafil to someone already taking cabergoline or another medicine that affects blood pressure, the prescriber may recommend starting with a lower dose (for example, 5 mg rather than 10 mg or 20 mg). This cautious approach allows you to see how your body responds to the combination and reduces the chance of dizziness or other side effects [5]. If the lower dose is well tolerated and effective, it can be continued; if not, the dose may be adjusted under medical supervision.

Practical Advice for Taking Vardenafil and Cabergoline Together

If your prescriber has confirmed that it's safe for you to take vardenafil and cabergoline together, follow their instructions carefully. Take each medicine exactly as prescribed, at the times and doses recommended. Vardenafil is usually taken about 25 to 60 minutes before sexual activity, and only once in any 24-hour period [5]. Cabergoline is typically taken once or twice a week with food to reduce the chance of nausea [12].

Be cautious when standing up quickly, especially in the first few hours after taking either medicine, as both can cause dizziness or light-headedness. Avoid drinking large amounts of alcohol, as this can make blood-pressure-lowering effects worse and may also impair erectile function [1]. Grapefruit juice can increase vardenafil levels and should be avoided [5].

If you experience persistent dizziness, fainting, chest pain during sex, or an erection lasting more than four hours, seek medical help immediately. These are rare but serious side effects that require urgent attention [5]. Do not stop or change the dose of cabergoline or vardenafil without consulting your prescriber, as both medicines need to be managed carefully to balance effectiveness and safety.

Other Medicines and Lifestyle Factors to Consider with Vardenafil and Cabergoline

In addition to cabergoline, you should tell your prescriber about any other medicines you take. Alpha-blockers (such as tamsulosin or doxazosin, used for prostate symptoms or high blood pressure) can interact with vardenafil, causing a significant drop in blood pressure; if you take an alpha-blocker, you must be stable on it before starting vardenafil, and you'll usually start on the lowest PDE5 dose [5]. Other blood-pressure medicines, antidepressants and some antibiotics or antifungals can also interact, so full disclosure is essential [5][12].

Lifestyle factors matter too. Smoking, heavy drinking, lack of exercise and poor diet can all worsen erectile dysfunction and reduce the effectiveness of treatment [1][2]. Managing underlying conditions such as diabetes, high cholesterol and obesity can improve both your general health and your response to ED treatment. Your GP or prescriber can offer advice and support on lifestyle changes that may help.

Remember that erectile dysfunction can be an early warning sign of cardiovascular disease [2]. If you're experiencing new or worsening ED, it's important to see your GP for a full assessment, even if you're already being treated for another condition. Addressing ED holistically—through medication, lifestyle changes and management of underlying health issues—gives you the best chance of a successful outcome.

When to Seek Further Medical Advice

If vardenafil doesn't work for you, or if you experience troublesome side effects, don't simply stop taking it or increase the dose on your own. Contact your prescriber to discuss alternative options. There are several other PDE5 inhibitors available (sildenafil, tadalafil, avanafil), and one may suit you better than another [1][2]. Your prescriber can also review your cabergoline dose and check whether your prolactin levels are well controlled, as optimising hormonal balance may further improve erectile function.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 28 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 28 October 2026]
3. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 28 October 2026]
4. Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 28 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.

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