Vardenafil and Levofloxacin: Can They Be Taken Together?

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What is vardenafil and what is it used for?

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 the 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 usually taken about 25 to 60 minutes before sexual activity [5]. The effect can last for several hours, but you should only take it once in any 24-hour period. It's important to remember that vardenafil will not work without sexual stimulation—it helps your body respond naturally when you're aroused.

At Cured Pharmacy, vardenafil is available on prescription after an online consultation with a UK-registered prescriber. The consultation ensures the medicine is safe and suitable for you, taking into account your medical history and any other medicines you're taking.

What is levofloxacin and when is it prescribed?

Levofloxacin is a broad-spectrum antibiotic from the fluoroquinolone family, used to treat a range of bacterial infections including respiratory tract infections, urinary tract infections, and skin infections. It works by killing bacteria or stopping them from multiplying, helping your body to fight off the infection.

Levofloxacin is usually prescribed as tablets or an intravenous infusion, depending on the severity and type of infection. The course length varies but is typically between 7 and 14 days. Like all antibiotics, it's important to complete the full course even if you start to feel better, to ensure the infection is fully cleared and to reduce the risk of antibiotic resistance.

Because levofloxacin can have side effects and interact with other conditions and medicines, your doctor will check that it's the right antibiotic for your infection and that it's safe for you to take alongside any other treatments you're using.

When to get urgent help

• Erection lasting more than four hours (priapism)—go to A&E immediately
• Sudden loss of vision or hearing—stop vardenafil and seek urgent medical help
• Chest pain during or after sex—stop activity, call 999 if pain does not resolve quickly
• Fast, irregular heartbeat, fainting, or severe dizziness—seek same-day medical assessment
• Severe allergic reaction (swelling of face, lips, tongue, or difficulty breathing)—call 999

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

Can vardenafil and levofloxacin be taken together?

There is no major direct drug interaction between vardenafil and levofloxacin that would make the combination unsafe for most people. However, both medicines can individually affect your heart rhythm (a condition known as QT prolongation), which in rare cases can lead to a serious irregular heartbeat. When two medicines that both carry this risk are taken together, the potential effect may be additive.

Your prescriber will carefully assess your individual risk during the consultation. They will check whether you have any heart conditions, whether you're taking other medicines that affect heart rhythm, and whether your potassium or magnesium levels are normal. If you have a history of heart rhythm problems or are taking other QT-prolonging medicines, your prescriber may advise extra caution or choose an alternative treatment.

It's also worth noting that levofloxacin can sometimes cause dizziness or lightheadedness, and vardenafil can lower blood pressure slightly. Taking them together may increase the chance of feeling dizzy, especially when standing up quickly. If you experience these symptoms, move slowly when getting up from sitting or lying down, and avoid driving or operating machinery until you know how the medicines affect you.

What your prescriber will check

Before prescribing vardenafil alongside levofloxacin, your prescriber will review your full medical history, including any heart conditions, recent heart attacks or strokes, blood pressure problems, and liver or kidney function. They will also check all your current medicines to identify any other interactions or risks.

You should always tell your prescriber if you're taking antibiotics or any other medicines, including over-the-counter products, herbal remedies, and supplements. This allows them to make a fully informed decision about whether vardenafil is safe for you at this time, or whether it would be better to wait until you've finished your antibiotic course.

How do vardenafil and levofloxacin interact in the body?

Vardenafil is broken down in the liver by an enzyme system called CYP3A4. Levofloxacin does not significantly inhibit or induce this enzyme, so it does not directly change the levels of vardenafil in your bloodstream. This is why no major pharmacokinetic interaction (a change in how the body processes the medicine) is expected between the two.

The main consideration is pharmacodynamic—how the medicines affect your body. Both vardenafil and levofloxacin can prolong the QT interval on an electrocardiogram (ECG), which measures the electrical activity of your heart. A prolonged QT interval can, in rare cases, lead to a type of irregular heartbeat called torsades de pointes, which can be serious.

For most people taking a short course of levofloxacin and a single dose of vardenafil, the risk is very low, especially if you have no underlying heart problems and are not taking other medicines that affect heart rhythm. Your prescriber will weigh this risk carefully and may advise monitoring or an alternative approach if your individual risk is higher.

At a glance

Practical advice when taking vardenafil and levofloxacin

If your prescriber has confirmed it's safe for you to take vardenafil while on levofloxacin, follow the dosing instructions for both medicines carefully. Take vardenafil about 25 to 60 minutes before planned sexual activity, and take levofloxacin at the times prescribed by your doctor, usually once or twice daily with or without food.

Avoid drinking large amounts of alcohol while taking either medicine, as alcohol can worsen erectile dysfunction, increase the risk of dizziness, and add to the blood-pressure-lowering effect of vardenafil. Grapefruit juice can raise vardenafil levels in your blood, so it's best to avoid it during treatment.

Stay well hydrated while taking levofloxacin, and be aware of common side effects such as nausea, diarrhoea, or dizziness. If you experience any unusual symptoms—such as a rapid or irregular heartbeat, fainting, severe dizziness, or chest pain—stop taking both medicines and seek medical advice immediately. If you have an erection lasting more than four hours, sudden vision or hearing loss, or chest pain during sex, call 999 or go to A&E straight away.

When to contact your doctor or pharmacist

Contact your GP or pharmacist if you develop new symptoms while taking vardenafil and levofloxacin together, or if you're unsure whether a symptom is a side effect. Common side effects of vardenafil include headache, flushing, nasal congestion, and indigestion, while levofloxacin can cause nausea, diarrhoea, and dizziness.

If you're prescribed any new medicines while taking levofloxacin, tell the prescriber you're also using vardenafil. Similarly, if you need to take vardenafil while on a course of antibiotics, always declare the antibiotic during your ED consultation so the prescriber can check for interactions.

Other medicines and conditions to consider with vardenafil

While vardenafil and levofloxacin can usually be taken together, there are some medicines that must never be combined with vardenafil. Do not take vardenafil if you are using nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites) [5]. The combination can cause a dangerous drop in blood pressure.

You should also avoid taking vardenafil with another PDE5 inhibitor (such as sildenafil, tadalafil, or avanafil) at the same time. If you're taking alpha-blockers for prostate problems or high blood pressure (such as doxazosin, tamsulosin, or alfuzosin), your prescriber will start you on the lowest dose of vardenafil and ensure you're stable on the alpha-blocker first, as the combination can cause dizziness or fainting [5].

Potent CYP3A4 inhibitors—including some HIV medicines (ritonavir, cobicistat), antifungals (ketoconazole, itraconazole), and the antibiotic clarithromycin—can raise vardenafil levels significantly. Vardenafil is usually avoided or contraindicated with these medicines [5]. Your prescriber will check the full list of your medicines during the consultation to ensure vardenafil is safe for you.

When vardenafil is not suitable

Vardenafil is not suitable if you've had a recent heart attack or stroke, have unstable angina, severe heart failure, very low blood pressure, or a history of sudden vision loss (non-arteritic anterior ischaemic optic neuropathy, or NAION) [5]. It's also not recommended if you have certain inherited eye conditions affecting the retina.

If you have liver or kidney problems, your prescriber may need to adjust your dose or choose a different treatment. Always be honest about your medical history during the consultation—it's the only way your prescriber can keep you safe and ensure the treatment works effectively.

In summary

• No major direct interaction between vardenafil and levofloxacin is commonly reported
• Both medicines can affect heart rhythm; prescriber checks your heart health carefully
• Dizziness may be more likely; move slowly when standing up
• Always declare all medicines during your consultation for a full safety check
• Seek urgent help for chest pain, fainting, or erection lasting over four hours

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