Vardenafil and Lorazepam: Can You Take Them Together?

Vardenafil and Lorazepam: Understanding the Interaction

Published: 1 November 2026

Many men wonder whether vardenafil and lorazepam can be taken together safely. Vardenafil (generic Levitra) is a prescription medicine used to treat erectile dysfunction, while lorazepam is a benzodiazepine prescribed for anxiety and sleep problems. There is no major direct interaction between these two medicines, but both can lower blood pressure and cause dizziness, so your prescriber will assess your individual circumstances carefully before approving treatment [5].

What Is Vardenafil and How Does It Work?

Vardenafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK for the treatment of erectile dysfunction in adult men [5]. It works by relaxing the 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 for the medicine to work [1].

The usual starting dose is 10 mg, taken about 25 to 60 minutes before sexual activity. Depending on how well it works and any side effects, your prescriber may adjust the dose to 5 mg or increase it to a maximum of 20 mg [5]. You should not take vardenafil more than once in 24 hours. Common side effects include headache, flushing, indigestion, and nasal congestion, which are usually mild and temporary.

Vardenafil is available on prescription after an online consultation with a UK-registered prescriber, who will check your medical history, current medicines, and whether the treatment is safe and suitable for you. At Cured Pharmacy, vardenafil is available from £16.95 (£13.56 with first-order code Ednew).

What Is Lorazepam and Why Is It Prescribed?

Lorazepam is a benzodiazepine medicine used to treat anxiety disorders and, occasionally, for short-term relief of severe anxiety or insomnia. It works by enhancing the effect of a natural calming chemical in the brain called gamma-aminobutyric acid (GABA), which helps to reduce feelings of anxiety and promote relaxation.

Lorazepam is usually prescribed at the lowest effective dose for the shortest possible time, because long-term use can lead to tolerance, dependence, and withdrawal symptoms. Common side effects include drowsiness, dizziness, muscle weakness, and unsteadiness. Because lorazepam can impair your ability to concentrate and react, you should not drive or operate machinery if you feel affected.

If you have been prescribed lorazepam for anxiety, it is important to tell your prescriber during any erectile dysfunction consultation. Anxiety itself can contribute to erectile difficulties, and treating the underlying anxiety may help improve sexual function over time [2]. Your prescriber will consider your full medication list to ensure that adding vardenafil is safe and appropriate for you.

Can Anxiety Affect Erectile Function?

Yes, anxiety is a well-recognised psychological cause of erectile dysfunction. Performance anxiety, stress, and generalised anxiety disorders can all interfere with sexual arousal and the ability to achieve or maintain an erection [2]. Treating the underlying anxiety—whether through talking therapies, lifestyle changes, or medication—can sometimes improve erectile function without the need for additional treatment. However, many men benefit from a combination approach that addresses both the psychological and physical aspects of ED.

Vardenafil and Lorazepam: Is There an Interaction?

There is no major direct pharmacological interaction between vardenafil and lorazepam. They work through different mechanisms in the body: vardenafil acts on blood vessels in the penis, while lorazepam affects neurotransmitters in the brain. However, both medicines can cause dizziness and a drop in blood pressure, so taking them together may increase the risk of feeling lightheaded or unsteady, particularly when standing up [5].

Your prescriber will assess whether it is safe for you to take vardenafil and lorazepam together by reviewing your full medical history, current medicines, blood pressure, and any history of fainting or dizziness. If you are stable on lorazepam and have no other risk factors, vardenafil can usually be prescribed safely, often starting at a lower dose to minimise side effects.

It is important never to stop or change your lorazepam without medical advice, as sudden withdrawal from benzodiazepines can cause serious symptoms. Always declare all medicines you are taking—including over-the-counter products and herbal supplements—during your consultation. Your prescriber and pharmacist will check for any interactions and ensure that the combination is appropriate for you.

What Your Prescriber Checks Before Approving Vardenafil

Before prescribing vardenafil, a UK-registered prescriber will carry out a thorough assessment to ensure the medicine is safe for you. This includes checking your cardiovascular health, because erectile dysfunction can be an early warning sign of heart disease or diabetes [1][2]. You will be asked about any history of heart attack, stroke, angina, heart failure, abnormal heart rhythms, and blood pressure problems.

Your prescriber will also review all your current medicines to identify any that could interact with vardenafil. Medicines that are absolutely contraindicated—meaning you must not take them with vardenafil—include nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, and recreational drugs known as 'poppers' (amyl or alkyl nitrites). Taking vardenafil with any of these can cause a dangerous drop in blood pressure [5].

If you take alpha-blockers for prostate symptoms (such as tamsulosin or doxazosin), your prescriber will check that you are stable on the alpha-blocker and may start you on a lower dose of vardenafil to reduce the risk of dizziness. Medicines that affect how the liver breaks down vardenafil—such as certain antibiotics, antifungals, and HIV medicines—may also require dose adjustments or mean that vardenafil is not suitable [5]. Your prescriber will explain any necessary precautions and answer your questions.

Why Is It Important to Declare All Your Medicines?

Declaring all your medicines—prescription, over-the-counter, herbal, and recreational—is essential for your safety. Some interactions can be life-threatening, while others may simply make the treatment less effective or increase side effects. Your prescriber and pharmacist are bound by confidentiality and are there to help, not to judge. Being honest about what you take ensures you receive the safest, most effective treatment for your individual circumstances.

Practical Advice for Taking Vardenafil and Lorazepam

If your prescriber approves vardenafil while you are taking lorazepam, follow their instructions carefully. 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]. Do not take more than one dose in 24 hours, and do not combine vardenafil with any other erectile dysfunction medicine.

Because both medicines can cause dizziness, be cautious when standing up quickly, especially after sitting or lying down for a while. Avoid drinking large amounts of alcohol, as this can worsen dizziness, lower blood pressure further, and make it harder to achieve an erection. If you feel very dizzy, faint, or unwell after taking vardenafil, sit or lie down and seek medical advice if symptoms do not improve.

Continue taking your lorazepam exactly as prescribed by your doctor. Do not stop or reduce your dose without medical advice, even if you feel better, as benzodiazepines need to be withdrawn gradually to avoid withdrawal symptoms. If you have any concerns about how your medicines are working together, contact your prescriber or pharmacist for advice. At Cured Pharmacy, our team is available to answer questions and support you throughout your treatment.

When to Seek Urgent Medical Help

Most men tolerate vardenafil well, but you should be aware of warning signs that require urgent medical attention. If you develop an erection that lasts longer than four hours (priapism), go to A&E immediately. Priapism is a medical emergency that can cause permanent damage to the penis if not treated promptly [5].

Seek urgent help if you experience sudden loss of vision in one or both eyes, as this may be a sign of a rare but serious condition called non-arteritic anterior ischaemic optic neuropathy (NAION). Similarly, sudden hearing loss or ringing in the ears requires immediate medical assessment [5]. If you develop chest pain during or after sexual activity, stop and seek medical help—do not take nitrate medicines such as GTN spray, as the combination with vardenafil can be dangerous.

If you experience severe dizziness, fainting, or an allergic reaction (such as swelling of the face, lips, or throat, or difficulty breathing), call 999 or go to A&E. Always carry a list of your current medicines, including vardenafil and lorazepam, so that healthcare professionals can treat you safely and avoid giving you any medicine that could interact.

What About Less Serious Side Effects?

Common side effects of vardenafil, such as headache, facial flushing, indigestion, and a blocked or runny nose, are usually mild and temporary [5]. If they persist or become bothersome, speak to your prescriber or pharmacist. You can often manage indigestion with simple antacids, and headaches may respond to paracetamol (check with your pharmacist first). If side effects are troublesome, your prescriber may suggest adjusting the dose or trying a different erectile dysfunction medicine.

Scientific References

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