Vardenafil and Mirtazapine: Can They Be Taken Together?

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Vardenafil and Mirtazapine: Understanding the Interaction

Published: 2 November 2026

Many men wonder whether vardenafil and mirtazapine can be taken together safely. The good news is that no major direct interaction is commonly reported between vardenafil (a medicine for erectile dysfunction) and mirtazapine (an antidepressant), but your prescriber will still carefully review your full medical history and current medicines during your consultation. This page explains what each medicine does, how they may affect each other, and the practical steps to use them safely.

What is vardenafil and mirtazapine?

Vardenafil is a prescription medicine used to treat erectile dysfunction (ED) 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. Vardenafil is the generic version of Levitra and is usually taken about 25 to 60 minutes before sexual activity, with doses of 5mg, 10mg or 20mg available [5]. It needs sexual stimulation to work and should not be taken more than once a day.

Mirtazapine is an antidepressant medicine used to treat depression and sometimes anxiety. It works by increasing the levels of certain natural chemicals (serotonin and noradrenaline) in the brain, which can help improve mood and emotional wellbeing. Mirtazapine is usually taken once a day, often at bedtime because it can cause drowsiness. It is prescribed by a doctor and is not related to erectile dysfunction treatment, although depression itself can contribute to ED [1].

Both medicines are prescription-only in the UK and require a clinical assessment by a qualified healthcare professional. At Cured Pharmacy, every prescription request is reviewed by a UK-registered prescriber who checks your medical history, current medicines, and any potential interactions before approving treatment.

Can you take vardenafil and mirtazapine together?

There is no major direct interaction commonly reported between vardenafil and mirtazapine, which means they can usually be taken together under medical supervision [5]. Unlike some other medicines that are absolutely contraindicated with vardenafil—such as nitrates, nicorandil, riociguat or poppers—mirtazapine does not cause a dangerous drop in blood pressure when combined with PDE5 inhibitors.

However, both medicines can cause side effects that may overlap. Mirtazapine can sometimes cause dizziness or drowsiness, and vardenafil may also cause dizziness or headache in some men [5]. If you experience these side effects together, they may feel more noticeable. Your prescriber will take this into account when reviewing your suitability for vardenafil treatment.

It is also worth noting that depression and the medicines used to treat it can sometimes affect sexual function. Some antidepressants are associated with sexual side effects, although mirtazapine is generally considered to have a lower risk compared to other classes such as SSRIs. If you have concerns about how your antidepressant is affecting your sexual health, discuss this with your GP or prescriber—they may be able to adjust your treatment or offer additional support [1][2].

Why your prescriber needs to know about mirtazapine

Even though vardenafil and mirtazapine do not have a major direct interaction, your prescriber must know about all medicines you are taking, including antidepressants. This is because your overall health picture—including your mental health, other conditions, and the full list of medicines—helps the prescriber decide whether vardenafil is safe and appropriate for you. Never stop or change your antidepressant without medical advice, as this can worsen your mental health.

What your prescriber checks during the consultation

When you request vardenafil through Cured Pharmacy, a UK-registered prescriber will review your online consultation carefully. They will check your current medicines (including mirtazapine), your medical history, blood pressure, heart health, and any other conditions that might affect the safety of ED treatment [2]. This thorough review is essential because some combinations of medicines or health conditions can make PDE5 inhibitors unsuitable or require dose adjustments.

The prescriber will specifically look for medicines that must never be taken with vardenafil, such as nitrates (GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational drugs called poppers (amyl or alkyl nitrites). These combinations can cause a dangerous fall in blood pressure and are absolutely contraindicated [5]. If you take any of these, you will not be able to use vardenafil or any other PDE5 inhibitor.

The prescriber will also check for medicines that can interact with vardenafil by affecting how it is broken down in the body. For example, potent CYP3A4 inhibitors (such as ritonavir, ketoconazole, itraconazole or clarithromycin) can raise vardenafil levels, and vardenafil is contraindicated or should be avoided with these medicines [5]. Alpha-blockers (such as tamsulosin or doxazosin) can add to the blood-pressure-lowering effect of vardenafil, so the prescriber will ensure you are stable on your alpha-blocker and may start you on a lower dose of vardenafil [5]. Mirtazapine does not fall into these high-risk categories, but it is still important to declare it so the prescriber has the full picture.

Practical advice for taking vardenafil with mirtazapine

If your prescriber approves vardenafil for you while you are taking mirtazapine, follow the dosing instructions carefully. Take vardenafil about 25 to 60 minutes before you plan to have sex, and remember that it only works when you are sexually aroused [5]. Do not take more than one dose in 24 hours, and do not take vardenafil with another PDE5 inhibitor (such as sildenafil, tadalafil or avanafil) on the same day.

Continue taking your mirtazapine exactly as prescribed by your doctor. Do not skip doses or stop your antidepressant because you are taking vardenafil—this can affect your mental health and is not necessary for safety. If you notice any new or unusual side effects after starting vardenafil, such as increased dizziness, headache, or any other concerns, contact your prescriber or GP for advice.

Avoid drinking large amounts of alcohol when taking vardenafil, as heavy alcohol can worsen erectile dysfunction and add to the blood-pressure-lowering effect, increasing the risk of dizziness [5]. Grapefruit juice can also raise vardenafil levels in the blood, so it is best to avoid it. If you experience an erection lasting more than four hours, sudden loss of vision or hearing, or chest pain during sex, seek urgent medical help immediately [5].

When to speak to your GP

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, diabetes or high blood pressure [1][2]. Your GP can arrange tests, review your overall health, and discuss treatment options. If you are already taking mirtazapine and notice changes in your sexual function, mention this to your GP—they can help you understand whether it is related to your medicine, your mental health, or another cause.

Other antidepressants and vardenafil interactions

Mirtazapine is just one type of antidepressant, and many men taking treatment for depression or anxiety wonder about interactions with ED medicines. Most antidepressants do not have a major direct interaction with vardenafil, but some can affect sexual function in other ways. For example, selective serotonin reuptake inhibitors (SSRIs) such as sertraline, citalopram or fluoxetine are commonly associated with sexual side effects, including reduced libido or difficulty achieving orgasm [1].

If you are taking an SSRI or another antidepressant and experiencing ED, it is important to discuss this with your GP. They may be able to adjust your dose, switch to a different antidepressant with fewer sexual side effects, or support you with ED treatment. Mirtazapine is generally considered to have a lower risk of sexual side effects compared to SSRIs, which is one reason some doctors may choose it for patients who are concerned about this issue.

Your prescriber at Cured Pharmacy will review any antidepressant you are taking during your consultation. While no major interaction is commonly reported between vardenafil and most antidepressants, the prescriber needs to know your full medicine list to ensure safe and effective treatment. Never stop or change your antidepressant without medical advice, as this can have serious consequences for your mental health.

Vardenafil and mirtazapine: what to avoid

While vardenafil and mirtazapine can usually be taken together, there are some important things to avoid to keep you safe. Never take vardenafil with nitrates (such as GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational drugs called poppers (amyl or alkyl nitrites). These combinations can cause a dangerous drop in blood pressure and are absolutely contraindicated [5]. Do not take vardenafil with another PDE5 inhibitor (such as sildenafil, tadalafil or avanafil) on the same day.

Avoid drinking large amounts of alcohol when taking vardenafil, as this can worsen erectile dysfunction and increase the risk of side effects such as dizziness or low blood pressure [5]. Grapefruit juice can raise vardenafil levels in the blood and should be avoided. If you are prescribed a new medicine by your GP or another healthcare professional while you are taking vardenafil, always tell them you are using ED treatment so they can check for interactions.

Do not stop or change your mirtazapine dose without speaking to your doctor, even if you are starting vardenafil. Your mental health treatment is important, and stopping antidepressants suddenly can cause withdrawal symptoms or a relapse of depression. If you have any concerns about how your medicines are working together, contact your prescriber or GP for advice. At Cured Pharmacy, our team is available to answer questions and provide support throughout your treatment.

Recognising warning signs

Most men tolerate vardenafil well, but it is important to know the warning signs that need urgent attention. Seek immediate medical help if you experience an erection lasting more than four hours (priapism), sudden loss of vision or hearing, or chest pain during sex [5]. If you feel dizzy, faint, or unwell after taking vardenafil, sit or lie down and contact a healthcare professional for advice. These side effects are rare, but prompt action is important if they occur.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 2 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 2 November 2026]
3. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 2 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.