Vardenafil and Agomelatine: Can You Take Them Together?

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Vardenafil and Agomelatine: Understanding the Interaction

Published: 27 October 2026

If you're considering vardenafil and agomelatine together, you'll be reassured to know that no major interaction is commonly reported between these two medicines. Vardenafil is a PDE5 inhibitor used to treat erectile dysfunction (ED), while agomelatine is an antidepressant prescribed for depression. Although they work through different mechanisms in the body, your prescriber will still review your full medication list during your consultation to ensure the combination is appropriate for you.

What is vardenafil and how does it work?

Vardenafil (also known by the brand name Levitra) is a prescription medicine licensed in the UK for erectile dysfunction [5]. 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're sexually aroused. Vardenafil does not cause an erection on its own—sexual stimulation is still needed for it to work.

The medicine 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 effect can last for several hours, but you should not take vardenafil more than once in 24 hours. Because vardenafil is broken down in the liver by an enzyme called CYP3A4, certain other medicines that affect this enzyme can alter how vardenafil works in your body.

Vardenafil is not suitable for everyone. It must not be taken with nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, or recreational drugs known as 'poppers', because the combination can cause a dangerous drop in blood pressure [5]. Your prescriber will check your medical history and current medicines before approving treatment.

What is agomelatine and why is it prescribed?

Agomelatine is an antidepressant medicine prescribed for major depressive episodes in adults. Unlike many other antidepressants, agomelatine works by acting on melatonin receptors (which help regulate your sleep-wake cycle) and blocking certain serotonin receptors in the brain. This dual action can help improve mood and restore normal sleep patterns, which are often disrupted in depression.

Agomelatine is usually taken once daily in the evening, at bedtime. It does not belong to the SSRI (selective serotonin reuptake inhibitor) or SNRI (serotonin-norepinephrine reuptake inhibitor) classes of antidepressants, and it has a different side-effect profile. One important consideration is that agomelatine can affect liver function, so your doctor will arrange blood tests to monitor your liver before and during treatment.

Depression itself is a recognised risk factor for erectile dysfunction [1]. Many men find that treating depression can improve their overall wellbeing and sexual function. However, some antidepressants—particularly SSRIs—can contribute to sexual side effects. Agomelatine is generally considered to have a lower risk of sexual side effects compared to SSRIs, which is one reason it may be chosen for men experiencing both depression and ED.

Does agomelatine cause erectile dysfunction?

Agomelatine is less commonly associated with sexual side effects than many other antidepressants. While any medicine can potentially affect sexual function, agomelatine's unique mechanism—acting on melatonin receptors rather than primarily on serotonin—means it tends to have a more favourable profile in this regard. If you're experiencing ED and taking agomelatine, it's worth discussing with your GP whether the depression itself, another medicine, or an underlying health condition might be contributing.

Can you take vardenafil and agomelatine together?

No major interaction is commonly reported between vardenafil and agomelatine. They work through different pathways in the body: vardenafil acts on blood vessels in the penis via the PDE5 enzyme, while agomelatine works on melatonin and serotonin receptors in the brain. Neither medicine is known to significantly affect the breakdown or effectiveness of the other.

That said, every person's situation is unique. Your prescriber will review your full medical history, all current medicines (including over-the-counter products and supplements), and any other health conditions during your consultation. This ensures that the combination is safe and appropriate for you personally. Even when no major interaction is expected, individual factors such as liver function, blood pressure, and overall cardiovascular health must be taken into account.

If you're already taking agomelatine and are considering vardenafil for ED, or vice versa, you should declare both medicines during your online consultation at Cured Pharmacy. Our UK-registered prescribers will assess your suitability and, if appropriate, approve treatment. Never start, stop, or change the dose of any prescribed medicine without first consulting a healthcare professional.

What does your prescriber check before approving vardenafil and agomelatine?

When you complete an online consultation for vardenafil, you'll be asked detailed questions about your medical history, current medicines, and overall health. The prescriber will specifically check for any contraindications to vardenafil, such as use of nitrates, recent heart attack or stroke, severe heart failure, very low blood pressure, or a history of sudden vision loss (NAION) [5]. They will also review whether you're taking any medicines that interact with vardenafil, such as potent CYP3A4 inhibitors or alpha-blockers.

If you're taking agomelatine, the prescriber will note this and confirm that no major interaction is expected. They will also consider whether your depression is well controlled, as untreated or poorly managed depression can itself contribute to erectile dysfunction [1]. If you're experiencing new or worsening ED, your prescriber may recommend that you see your GP for a full assessment, as ED can be an early warning sign of cardiovascular disease or diabetes [2].

The prescriber will also check your blood pressure and cardiovascular fitness, because sexual activity places demands on the heart. If you're taking other medicines that lower blood pressure—such as antihypertensives or alpha-blockers—the prescriber will ensure you start on the lowest appropriate dose of vardenafil and monitor for dizziness or light-headedness. This careful review process is designed to keep you safe and ensure the treatment is likely to be effective.

Starting vardenafil while on agomelatine

If you're already stable on agomelatine and your depression is well managed, starting vardenafil is usually straightforward, provided you have no other contraindications. Your prescriber will recommend the appropriate starting dose—often 10 mg, taken about 25 to 60 minutes before sexual activity [5]. You should not take vardenafil more than once in 24 hours, and you should avoid heavy alcohol and grapefruit juice, as these can interfere with how the medicine works or increase the risk of side effects.

Practical advice for taking vardenafil and agomelatine safely

Take each medicine exactly as prescribed. Agomelatine is usually taken once daily at bedtime, while vardenafil is taken on demand, about 25 to 60 minutes before you plan to have sex [5]. There is no need to adjust the timing of your agomelatine dose when you take vardenafil—simply continue with your usual routine. Both medicines can be taken with or without food, although a very heavy, high-fat meal may delay how quickly vardenafil starts to work.

Be aware of the common side effects of each medicine. Vardenafil can cause headache, flushing, nasal congestion, indigestion, or dizziness [5]. Agomelatine may cause dizziness, drowsiness, headache, or nausea, particularly when you first start taking it. If you experience dizziness with either medicine, avoid driving or operating machinery until you know how you react. Drinking alcohol can worsen dizziness and may also make erectile dysfunction worse, so it's best to limit your intake.

If you develop any new or unusual symptoms after starting vardenafil, contact your prescriber or GP. Seek urgent medical help (call 999 or go to A&E) if you experience an erection lasting more than four hours (priapism), sudden loss of vision or hearing, or chest pain during sex [5]. These are rare but serious side effects that require immediate attention. Always keep your prescriber informed of any changes to your health or other medicines, including those prescribed by your GP or bought over the counter.

Other medicines and lifestyle factors to consider with vardenafil and agomelatine

While vardenafil and agomelatine can usually be taken together safely, other medicines in your regimen may require closer attention. For example, if you're taking an alpha-blocker for an enlarged prostate (such as tamsulosin or doxazosin), there is a risk of low blood pressure when combined with vardenafil [5]. Your prescriber will ensure you're stable on the alpha-blocker and will start you on the lowest dose of vardenafil. Similarly, potent CYP3A4 inhibitors—such as certain antifungals (ketoconazole, itraconazole), some antibiotics (clarithromycin), or HIV medicines (ritonavir, cobicistat)—can raise vardenafil levels and increase the risk of side effects. Vardenafil is contraindicated or requires dose adjustment with these medicines [5].

Lifestyle factors also play an important role in managing both depression and erectile dysfunction. Regular physical activity, a balanced diet, maintaining a healthy weight, and not smoking can all improve cardiovascular health and sexual function [2]. If you smoke, quitting is one of the most effective steps you can take to improve ED. Managing stress and getting enough sleep are also important, particularly when you're being treated for depression.

If you're taking agomelatine, your doctor will have arranged liver function tests before you started treatment and will monitor these periodically. If you notice any signs of liver problems—such as yellowing of the skin or eyes, dark urine, persistent nausea, or abdominal pain—contact your GP immediately. While vardenafil does not directly affect the liver in the same way, it's important to attend all monitoring appointments and keep your healthcare team informed of all the medicines you're taking.

When to see your GP

If you're experiencing erectile dysfunction for the first time, it's important to see your GP for a full assessment [1][2]. ED can be an early warning sign of underlying health conditions such as cardiovascular disease, diabetes, or high blood pressure. Your GP can arrange tests, review your medicines, and discuss treatment options. If you're already being treated for depression with agomelatine and develop new sexual difficulties, discuss this with your GP—they may be able to adjust your treatment or investigate other causes.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 27 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 27 October 2026]
3. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 27 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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