Vardenafil and Prochlorperazine: Safe Together?

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Vardenafil and Prochlorperazine: Understanding the Interaction

Published: 3 November 2026

Many men wonder whether vardenafil and prochlorperazine can be taken together safely. The good news is that no major direct interaction is commonly reported between these two medicines, but both can lower blood pressure, so your prescriber will check your overall health and current medicines carefully. This page explains what each medicine does, how they may interact, and the practical steps to use them safely.

What Is Vardenafil and What Does It Treat?

Vardenafil is a prescription medicine used to treat erectile dysfunction (ED) in adult men. 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 [5]. Vardenafil is the generic version of the branded medicine Levitra and is available in 5 mg, 10 mg, and 20 mg tablets.

You typically take vardenafil about 25 to 60 minutes before sexual activity, and it can remain effective for several hours [5]. It only works when you are sexually stimulated—it will not cause an erection on its own. Vardenafil is not suitable for everyone: it must not be taken with nitrates, nicorandil, riociguat, poppers, or another PDE5 inhibitor, as these combinations can cause a dangerous drop in blood pressure [5].

Common side effects include headache, flushing, indigestion, and nasal congestion. Vardenafil is only available on prescription in the UK after a clinical assessment by a registered prescriber, who will check your medical history, current medicines, and whether the treatment is safe for you [5].

What Is Prochlorperazine and Why Is It Prescribed?

Prochlorperazine is a prescription medicine primarily used to treat severe nausea and vomiting, vertigo (a spinning sensation), and certain mental health conditions such as schizophrenia. It belongs to a class of medicines called phenothiazines, which work by blocking dopamine receptors in the brain. This action helps to reduce feelings of sickness and can also calm abnormal thoughts or agitation.

Prochlorperazine is available as tablets, buccal (dissolving) tablets, and injections. It is commonly prescribed for short-term relief of nausea caused by migraines, inner-ear problems (such as Ménière's disease), or after surgery. Because it affects the central nervous system, prochlorperazine can cause side effects including drowsiness, dizziness, dry mouth, and low blood pressure, especially when you stand up quickly.

Like all medicines, prochlorperazine interacts with your body's systems, and it is important that your prescriber knows about every medicine you take—including treatments for erectile dysfunction—so they can assess the overall risk and adjust doses if needed.

How Do Vardenafil and Prochlorperazine Interact?

No major direct pharmacological interaction is commonly reported between vardenafil and prochlorperazine. However, both medicines can lower blood pressure, and taking them together may add to this effect. Vardenafil works by relaxing blood vessels, which can cause a modest drop in blood pressure [5]. Prochlorperazine can also lower blood pressure, particularly when you stand up (a condition called postural hypotension), and may cause dizziness or light-headedness.

When two medicines that both lower blood pressure are taken together, there is a theoretical risk that you may feel dizzy, faint, or unsteady, especially when you first stand up or if you are dehydrated. This does not mean the combination is unsafe for everyone, but it does mean your prescriber will need to review your full medical history, check your blood pressure, and ensure you are not taking other medicines that add to this risk.

During your online consultation at Cured Pharmacy, the prescriber will ask about all your current medicines, including prochlorperazine, and will assess whether vardenafil is suitable for you. If the combination is appropriate, they may advise you to start on the lowest effective dose of vardenafil and to be cautious when standing up quickly, particularly after taking the first dose.

The Mechanism in Plain English

Think of your blood vessels as flexible tubes. Vardenafil relaxes the walls of these tubes in the penis, allowing more blood to flow in and helping you achieve an erection when you are aroused. At the same time, it can relax blood vessels elsewhere in the body slightly, which may lower your overall blood pressure a little. Prochlorperazine affects the brain's control centres and can also relax blood vessels, particularly when you change position. When both medicines are working at the same time, the combined effect on blood pressure may be more noticeable, so your body needs to be able to cope with that change safely.

What Your Prescriber Checks Before Approving Vardenafil and Prochlorperazine

When you request vardenafil through Cured Pharmacy's online consultation, a UK-registered prescriber reviews every detail you provide. They will ask about all your current medicines, including prochlorperazine, and check for any conditions that might make vardenafil unsuitable. Key checks include your blood pressure, heart health, and whether you take any medicines that are absolutely contraindicated with vardenafil, such as nitrates, nicorandil, riociguat, or poppers [5].

If you are taking prochlorperazine, the prescriber will assess whether you have experienced dizziness or low blood pressure as a side effect, and whether you take other medicines that also lower blood pressure (such as antihypertensives or alpha-blockers). They may recommend starting on the lowest dose of vardenafil (5 mg) and monitoring how you feel after the first dose. You should never adjust the dose yourself or take vardenafil more frequently than once a day [5].

The prescriber will also check that you do not have conditions that make sexual activity inadvisable, such as recent heart attack or stroke, unstable angina, severe heart failure, very low blood pressure, or a history of sudden vision loss (NAION) [5]. If vardenafil is not suitable, they may suggest an alternative treatment or advise you to see your GP for a face-to-face review.

Practical Safety Advice When Taking Vardenafil and Prochlorperazine Together

If your prescriber approves the combination of vardenafil and prochlorperazine, follow these practical steps to minimise the risk of side effects. Take vardenafil about 25 to 60 minutes before you plan to have sex, and do not take it more than once in 24 hours [5]. Avoid heavy meals and excessive alcohol before taking vardenafil, as both can reduce its effectiveness and add to the blood-pressure-lowering effect.

Be especially careful when standing up from sitting or lying down, particularly after taking the first dose of vardenafil. Stand up slowly and steady yourself to avoid dizziness or fainting. If you feel light-headed, sit or lie down until the feeling passes, and drink water if you are dehydrated. Do not drive or operate machinery if you feel dizzy or drowsy.

Keep all your medicines in their original packaging and store them as directed. Do not share vardenafil with anyone else, even if they have similar symptoms. If you experience any new or worsening side effects—such as severe dizziness, chest pain, prolonged erection (lasting more than four hours), or sudden loss of vision or hearing—seek urgent medical help immediately [5]. Always tell any healthcare professional you see (including your GP, dentist, or hospital doctor) that you are taking both vardenafil and prochlorperazine.

When to Seek Medical Advice

Contact your GP or pharmacist if you develop new side effects after starting vardenafil, such as persistent headache, flushing, indigestion, or nasal congestion that does not settle. If you feel unusually dizzy or faint, especially when standing, or if your blood pressure drops significantly, seek advice the same day. Do not stop taking prochlorperazine suddenly without speaking to your doctor, as it may have been prescribed for an important reason, and stopping abruptly can sometimes cause withdrawal symptoms or a return of your original symptoms.

Other Medicines and Lifestyle Factors That Affect Vardenafil and Prochlorperazine

Vardenafil interacts with several other medicines, and it is essential that your prescriber knows about everything you take. Never take vardenafil with nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, poppers (amyl or alkyl nitrites), or another PDE5 inhibitor, as these combinations can cause a dangerous fall in blood pressure [5]. If you take alpha-blockers (such as doxazosin or tamsulosin) for prostate problems or high blood pressure, you must be stable on the alpha-blocker and start on the lowest dose of vardenafil, as the combination can also lower blood pressure significantly [5].

Potent CYP3A4 inhibitors (such as ritonavir, cobicistat, ketoconazole, itraconazole, or clarithromycin) can raise vardenafil levels in your blood, increasing the risk of side effects. Vardenafil is contraindicated or requires dose adjustment with these medicines, so your prescriber will check the summary of product characteristics (SmPC) carefully [5]. CYP3A4 inducers (such as rifampicin, carbamazepine, phenytoin, or St John's wort) can make vardenafil less effective.

Grapefruit juice can raise vardenafil levels, so it is best avoided. Heavy alcohol can worsen erectile dysfunction and add to the blood-pressure-lowering effect, so drink in moderation [1]. Prochlorperazine can cause drowsiness, and this may be made worse by alcohol or other sedating medicines. Smoking, lack of exercise, and poor diet can all contribute to ED, so lifestyle changes—alongside treatment—can improve your results [1][2].

Reporting Side Effects

If you experience side effects from vardenafil or prochlorperazine, you can report them via the UK Yellow Card Scheme at https://yellowcard.mhra.gov.uk or by searching for 'Yellow Card' in the Google Play or Apple App Store. Reporting side effects helps the Medicines and Healthcare products Regulatory Agency (MHRA) monitor the safety of medicines and protect public health.

Scientific References

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