Vardenafil and Nitrazepam: Can You Take Them Together?

Vardenafil and Nitrazepam: Understanding the Interaction

Published: 2 November 2026

Many men wonder whether vardenafil and nitrazepam can be taken together safely. Vardenafil is a prescription treatment for erectile dysfunction (ED), while nitrazepam is a benzodiazepine sleeping tablet. The good news is that there is no major direct interaction between these two medicines, but your prescriber will still need to check your full medical history and current medications to ensure treatment is safe for you.

What Is Vardenafil and How Does It Work?

Vardenafil, sold under the brand name Levitra, is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction [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.

In the UK, vardenafil is available in 5mg, 10mg, and 20mg tablets. The usual starting dose is 10mg, taken about 25 to 60 minutes before sexual activity, with a maximum of one dose per day [5]. The medicine can help men achieve and maintain an erection sufficient for sexual intercourse when taken as directed.

Like all PDE5 inhibitors, vardenafil requires a prescription and is only supplied after an online or face-to-face consultation with a UK-registered prescriber. The prescriber will check your medical history, current medicines, and cardiovascular health to ensure vardenafil is suitable and safe for you.

What Is Nitrazepam and What Is It Used For?

Nitrazepam is a benzodiazepine medicine prescribed for the short-term treatment of severe insomnia that is disabling or causing significant distress. It works by enhancing the effect of a natural calming chemical in the brain called gamma-aminobutyric acid (GABA), which helps you fall asleep and stay asleep.

Nitrazepam is typically prescribed at a dose of 5mg to 10mg taken at bedtime. Because benzodiazepines can be habit-forming, nitrazepam is usually only recommended for short periods—typically two to four weeks at most. Long-term use can lead to tolerance, dependence, and withdrawal symptoms when stopping.

Common side effects of nitrazepam include drowsiness the next day, confusion, dizziness, and impaired coordination. It can also affect your ability to drive or operate machinery safely. Your GP or sleep specialist will review whether nitrazepam is still needed and may suggest other approaches to managing insomnia, such as cognitive behavioural therapy for insomnia (CBT-I).

Why Nitrazepam Is Prescribed Short-Term

Benzodiazepines like nitrazepam are effective for sleep in the short term, but their benefits tend to diminish with continued use. The body adapts to the medicine, meaning higher doses may be needed to achieve the same effect, increasing the risk of side effects and dependence. For this reason, UK prescribing guidelines recommend using nitrazepam only when insomnia is severe and other non-drug approaches have not worked.

Vardenafil and Nitrazepam: Is There a Direct Interaction?

There is no major direct pharmacological interaction between vardenafil and nitrazepam. They work through different mechanisms in the body: vardenafil acts on blood vessels in the penis, while nitrazepam affects brain chemicals that regulate sleep. Neither medicine is known to significantly alter the levels or effects of the other in a way that would make the combination unsafe.

However, both medicines can cause dizziness and a drop in blood pressure, especially when you stand up quickly. Taking them together may add to these effects, so it is important to be cautious, particularly when getting out of bed at night or in the morning. If you feel dizzy or lightheaded, sit or lie down until the feeling passes.

Your prescriber will still review all your current medicines during your consultation, including nitrazepam, to check for any individual factors that might affect your treatment. It is essential to declare every medicine you take—prescription, over-the-counter, and herbal—so the prescriber can make a fully informed decision about your suitability for vardenafil.

What Your Prescriber Checks Before Prescribing Vardenafil and Nitrazepam

When you request vardenafil, the prescriber will ask about all your current medicines, including nitrazepam, to check for interactions and ensure the combination is safe for you. They will also ask about your cardiovascular health, blood pressure, and any history of heart problems, stroke, or liver and kidney disease [5].

The prescriber will specifically 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). These combinations can cause a dangerous drop in blood pressure and must be avoided [5].

If you are taking alpha-blockers for prostate symptoms or high blood pressure (such as tamsulosin or doxazosin), the prescriber will ensure you are stable on that treatment and may start you on a lower dose of vardenafil to reduce the risk of dizziness or fainting. They will also check for potent CYP3A4 inhibitors, which can raise vardenafil levels and increase the risk of side effects [5].

Why Full Disclosure Matters

Even if you think a medicine is unrelated to ED treatment, it is vital to list everything you take. Some medicines can interact in unexpected ways, and others may give the prescriber important clues about your overall health. For example, if you are taking nitrazepam for sleep, the prescriber may also ask about stress, anxiety, or depression, which can contribute to erectile dysfunction and may benefit from additional support [1].

Practical Advice When Taking Vardenafil and Nitrazepam Together

If your prescriber approves vardenafil while you are taking nitrazepam, there are some practical steps you can take to use both medicines safely. First, be aware that both can cause dizziness, especially when standing up. Get up slowly from sitting or lying down, particularly at night or first thing in the morning, to reduce the risk of falls.

Avoid drinking large amounts of alcohol, as it can worsen erectile dysfunction, increase drowsiness from nitrazepam, and add to the blood-pressure-lowering effects of vardenafil. Heavy alcohol can also make it harder to achieve an erection, even with treatment [1].

Take vardenafil about 25 to 60 minutes before you plan to have sex, and remember that sexual stimulation is needed for it to work [5]. If you have taken nitrazepam the night before and feel drowsy or unsteady the next day, consider whether you are in the right condition for sexual activity. If you experience any unexpected side effects, such as prolonged dizziness, chest pain, or an erection lasting more than four hours, seek medical help immediately.

When to Seek Further Advice About Vardenafil and Nitrazepam

If you are taking nitrazepam and considering vardenafil for erectile dysfunction, it is important to have an open conversation with your prescriber or GP. They can review your sleep treatment, check whether nitrazepam is still needed, and explore whether any underlying issues—such as anxiety, depression, or stress—might be contributing to both your sleep problems and ED [1][2].

If you experience new or worsening symptoms while taking both medicines, such as severe dizziness, fainting, confusion, or difficulty breathing, contact your GP or call NHS 111 for advice. Do not stop taking a prescribed medicine without speaking to a healthcare professional first, as sudden withdrawal from nitrazepam can cause unpleasant or even dangerous symptoms.

Remember that erectile dysfunction can be an early warning sign of cardiovascular disease or diabetes, so it is always worth seeing your GP for a full health check if you have not already done so [1]. Treating ED is important, but so is identifying and managing any underlying health conditions that may be contributing to it.

Support Beyond Medication

Both sleep problems and erectile dysfunction can have psychological as well as physical causes. If stress, anxiety, or relationship difficulties are playing a role, your GP may suggest talking therapies, lifestyle changes, or referral to a specialist. Addressing these factors can improve both your sleep and your sexual health, and may reduce your need for medicines like nitrazepam in the long term [2].

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.

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