Vardenafil and Penicillin V: Can You Take Them Together?

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What Is Vardenafil and How Does It Work?

Vardenafil is a prescription medicine used to treat erectile dysfunction (ED) in adult men [5]. It belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors, which work by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused [5].

Vardenafil is available in 5mg, 10mg, and 20mg tablets and is typically taken about 25 to 60 minutes before sexual activity [5]. The medicine does not work without sexual stimulation, and you should not take it more than once in 24 hours. The effect can last for several hours, helping you achieve and maintain an erection suitable for sexual activity when you are aroused.

In the UK, vardenafil is available as a generic medicine (sometimes called generic Levitra) and requires a prescription following a clinical assessment by a UK-registered prescriber. At Cured Pharmacy, vardenafil is available from £16.95 (or £13.56 for your first order with code Ednew) after an online consultation reviewed by our prescribing team.

What Is Penicillin V and When Is It Prescribed?

Penicillin V (also known as phenoxymethylpenicillin) is an antibiotic used to treat bacterial infections such as throat infections, ear infections, skin infections, and to prevent certain infections in people who have had their spleen removed or who have sickle cell disease. It works by killing bacteria or stopping them from multiplying.

Penicillin V is usually taken two to four times a day, depending on the infection being treated and your doctor's instructions. It is important to complete the full course of antibiotics even if you start to feel better, as stopping early can allow the infection to return or contribute to antibiotic resistance.

Because penicillin V is prescribed for short-term infections, many men taking regular ED treatment may need both medicines at the same time. Understanding how they interact is important for safe and effective treatment.

How Antibiotics Are Processed in the Body

Penicillin V is absorbed from the gut and eliminated mainly through the kidneys. Unlike some other antibiotics, penicillin V does not significantly affect the liver enzymes (particularly CYP3A4) that break down vardenafil and other PDE5 inhibitors. This is why no major interaction between vardenafil and penicillin V is commonly reported in clinical practice.

Vardenafil and Penicillin V: Is There an Interaction?

No major interaction is commonly reported between vardenafil and penicillin V. Penicillin V does not affect the liver enzymes responsible for breaking down vardenafil, so it is unlikely to increase vardenafil levels in your blood or change how the ED medicine works.

However, it is essential to declare all medicines you are taking—including antibiotics—when you request vardenafil. Your prescriber or pharmacist will review your full medication list during the consultation to check for any potential issues specific to your situation. This includes checking for other medicines that might interact with vardenafil, even if penicillin V itself does not.

While the combination is generally considered safe, feeling unwell from an infection can sometimes affect sexual function temporarily. If you are taking penicillin V because you have an active infection, you may not feel well enough for sexual activity until you have recovered. Always listen to your body and prioritise your overall health.

Why Your Prescriber Checks Every Medicine

Even when one medicine does not interact with vardenafil, your prescriber must review your complete medication list because you may be taking other medicines that do interact. For example, some men taking antibiotics may also be on blood pressure medicines, alpha-blockers, or other treatments that require dose adjustments or additional precautions when combined with vardenafil [5].

What you need to know

• No major interaction is commonly reported between vardenafil and penicillin V
• Always declare all medicines including antibiotics during your ED consultation
• Some antibiotics like clarithromycin are contraindicated with vardenafil
• Your prescriber reviews your full medication list to ensure safe treatment
• Feeling unwell from infection may affect sexual function temporarily

Antibiotics That May Affect Vardenafil Levels

While penicillin V does not interact with vardenafil, some other antibiotics can affect how your body processes PDE5 inhibitors. Clarithromycin and erythromycin (macrolide antibiotics) are potent inhibitors of the CYP3A4 enzyme, which breaks down vardenafil [5]. If you take these antibiotics, vardenafil levels in your blood may rise, increasing the risk of side effects.

Vardenafil is contraindicated (must not be used) with potent CYP3A4 inhibitors such as clarithromycin, ketoconazole, and itraconazole [5]. If you are prescribed one of these medicines, your prescriber will need to consider an alternative ED treatment or adjust your treatment plan accordingly.

Other commonly prescribed antibiotics—such as amoxicillin, flucloxacillin, doxycycline, and trimethoprim—do not significantly affect vardenafil levels and are not expected to interact. However, always declare every medicine, supplement, or herbal remedy you are taking so your prescriber can make a fully informed decision.

What Your Prescriber Will Check Before Approving Vardenafil

When you request vardenafil through Cured Pharmacy, a UK-registered prescriber will review your online consultation to ensure the medicine is safe and suitable for you. They will check your current medicines (including penicillin V or any other antibiotics), your medical history, and any conditions that might make vardenafil unsuitable [5].

Vardenafil must never be taken with nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, or recreational drugs called 'poppers' (amyl or alkyl nitrites), as the combination can cause a dangerous drop in blood pressure [5]. Your prescriber will also check whether you are taking alpha-blockers (such as tamsulosin or doxazosin), as these can add to the blood-pressure-lowering effect of vardenafil and require a lower starting dose [5].

You will also be asked about heart conditions, recent stroke or heart attack, very low blood pressure, previous sudden vision loss (NAION), and any severe liver or kidney problems. If sexual activity is inadvisable for you due to your heart health, vardenafil will not be prescribed [5]. This thorough review ensures that vardenafil is both safe and likely to be effective for you.

Starting Vardenafil Safely

Most men start on vardenafil 10mg, taken about 25 to 60 minutes before sexual activity [5]. Depending on how well it works and whether you experience side effects, your prescriber may adjust the dose to 5mg or increase it to a maximum of 20mg. You should not take vardenafil more than once in 24 hours, and it requires sexual stimulation to work.

When to get urgent help

• Erection lasting more than 4 hours (priapism) – go to A&E immediately
• Sudden loss of vision or hearing – seek urgent medical help
• Chest pain during or after sexual activity – call 999
• Severe allergic reaction (rash, swelling, difficulty breathing) – call 999
• Severe dizziness or fainting after taking vardenafil – seek same-day medical advice

Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.

Practical Advice for Taking Vardenafil and Penicillin V Together

If you have been prescribed both vardenafil and penicillin V, you can usually take them on the same day without concern. There is no need to separate the doses by a specific number of hours, as no major interaction is commonly reported. However, follow the dosing instructions for each medicine as directed by your prescriber or on the label.

Take penicillin V on an empty stomach (at least 30 minutes before food or two to three hours after food) if possible, as this helps the antibiotic work most effectively. Vardenafil can be taken with or without food, although a heavy or high-fat meal may delay how quickly it works [5]. Avoid drinking excessive alcohol when taking vardenafil, as alcohol can make ED worse and add to the blood-pressure-lowering effect, causing dizziness.

If you feel unwell from your infection, it is perfectly reasonable to wait until you have recovered before using vardenafil. ED medicines work best when you are feeling well and relaxed. If you have any concerns about taking the two medicines together, speak to your pharmacist or prescriber for personalised advice.

When to Seek Further Advice

Contact your GP or pharmacist if you experience unexpected side effects when taking vardenafil and penicillin V together, such as severe dizziness, fainting, chest pain, or an allergic reaction (rash, swelling, difficulty breathing). If you develop an erection lasting more than four hours (priapism), sudden loss of vision or hearing, or chest pain during sexual activity, seek urgent medical help immediately [5].

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