Vardenafil and Clindamycin: Can You Take Them Together?

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Key takeaways

• No major interaction between vardenafil and clindamycin is commonly reported
• Your prescriber reviews all medicines during consultation to ensure safety
• Some other antibiotics can interact with vardenafil and require dose adjustment
• Always complete your clindamycin course and take vardenafil as prescribed
• Seek urgent help for erection lasting over 4 hours or chest pain during sex

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 PDE5 inhibitors, which work by relaxing blood vessels in the penis, allowing more blood to flow in when you're sexually aroused. This helps you get and keep an erection suitable for sexual activity.

Vardenafil is available in 5mg, 10mg and 20mg tablets, and is usually taken about 25 to 60 minutes before sex [5]. The effect can last for several hours, but you'll only get an erection when you're sexually stimulated – the medicine doesn't work automatically. You should not take vardenafil more than once a day.

Like all PDE5 inhibitors, vardenafil is only available on prescription in the UK after a consultation with a doctor or prescriber. At Cured Pharmacy, our UK-registered prescribers review your medical history and current medicines to make sure vardenafil is safe and suitable for you.

What Is Clindamycin and Why Is It Prescribed?

Clindamycin is an antibiotic used to treat a range of bacterial infections, including skin and soft tissue infections, dental infections, bone and joint infections, and some pelvic infections. It works by stopping bacteria from making the proteins they need to grow and multiply, which helps your immune system clear the infection.

Clindamycin is available as capsules, an oral solution, and topical preparations (creams, gels and lotions). The dose and length of treatment depend on the type and severity of the infection. It's important to complete the full course of clindamycin even if you start to feel better, as stopping early can allow the infection to come back or develop resistance.

Like all antibiotics, clindamycin should only be used when prescribed by a doctor or dentist. It's not suitable for viral infections such as colds or flu. Common side effects include diarrhoea, nausea and stomach upset; if you develop severe or persistent diarrhoea (especially with blood or mucus), contact your GP straight away, as this can be a sign of a serious bowel condition.

Do Vardenafil and Clindamycin Interact?

No major interaction between vardenafil and clindamycin is commonly reported in the medical literature or drug-interaction databases. Clindamycin is not known to significantly affect the way vardenafil is broken down in the body, and vardenafil does not interfere with the antibacterial action of clindamycin.

However, it's still important to tell your prescriber about all medicines you're taking – including antibiotics – when you request vardenafil. This is because your prescriber needs to review your full medication list and medical history to check for any other interactions or conditions that might affect the safety of vardenafil [5].

For example, some other antibiotics (such as clarithromycin and erythromycin) are potent CYP3A4 inhibitors and can raise vardenafil levels in the blood, requiring dose adjustments or making vardenafil unsuitable. Clindamycin does not have this effect, but your prescriber will still want to know about it to build a complete picture of your health and treatment.

Why Your Prescriber Checks Every Medicine

Even when no major interaction is expected, your prescriber will review all your current medicines during the consultation. This includes prescription medicines, over-the-counter treatments, herbal remedies and supplements. Some medicines can interact with vardenafil in ways that increase side effects or reduce effectiveness, so a thorough check is an essential part of safe prescribing [5].

Never stop or change a prescribed medicine (including clindamycin) without advice from your doctor or pharmacist. If you're unsure whether a new medicine is safe to take with vardenafil, ask your prescriber or pharmacist before starting it.

Medicines That Do Interact with Vardenafil

While clindamycin is not a concern, there are some medicines you must never take with vardenafil because they can cause a dangerous drop in blood pressure. These include nitrates (such as GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, and amyl or alkyl nitrites (poppers). Do not take vardenafil with another PDE5 inhibitor (such as sildenafil, tadalafil or avanafil) [5].

Alpha-blockers (used for prostate problems or high blood pressure, such as doxazosin, tamsulosin, alfuzosin) can also lower blood pressure when combined with vardenafil, causing dizziness or fainting. If you take an alpha-blocker, your prescriber will check that you're stable on it and may start you on a lower dose of vardenafil [5].

Potent CYP3A4 inhibitors – including some antifungals (ketoconazole, itraconazole), some antibiotics (clarithromycin, erythromycin), and HIV medicines (ritonavir, cobicistat) – can raise vardenafil levels significantly. Vardenafil is often contraindicated or requires careful dose adjustment with these medicines [5]. Your prescriber will review the summary of product characteristics (SmPC) if you take any of these.

Other Medicines and Lifestyle Factors

Other blood-pressure medicines can add to the blood-pressure-lowering effect of vardenafil, which may cause dizziness. This is usually manageable, but you must declare all blood-pressure medicines during your consultation [5].

CYP3A4 inducers (such as rifampicin, carbamazepine, phenytoin, and St John's wort) can make vardenafil less effective by speeding up how quickly your body breaks it down. Grapefruit juice can raise vardenafil levels and should be avoided. Heavy alcohol can worsen ED and add to the blood-pressure-lowering effect, so it's best to limit alcohol when using vardenafil [5].

What Your Prescriber Checks Before Prescribing Vardenafil and Clindamycin

When you request vardenafil through Cured Pharmacy, our UK-registered prescribers will ask about your medical history, current medicines (including clindamycin), and any allergies. They'll check whether you have any conditions that make vardenafil unsuitable, such as recent heart attack or stroke, unstable angina, severe heart failure, very low blood pressure, or previous sudden vision loss (NAION) [5].

Your prescriber will also review whether sexual activity is safe for you. If you have heart disease or other cardiovascular conditions, your doctor may want to assess your fitness for sex before prescribing ED treatment [2]. This is a routine part of safe prescribing and helps protect your health.

If you're taking clindamycin for an infection, your prescriber will note this but it won't usually affect your suitability for vardenafil. However, if you're unwell with a serious infection or have other health concerns, your prescriber may advise waiting until you've recovered before starting ED treatment. Always answer all questions honestly and fully during your consultation – this helps your prescriber make the safest decision for you.

Practical Advice for Taking Vardenafil and Clindamycin Safely

If you've been prescribed both vardenafil and clindamycin, you can usually take them together without concern. Take each medicine exactly as prescribed: clindamycin is typically taken with a full glass of water (and often with food to reduce stomach upset), while vardenafil is taken about 25 to 60 minutes before sexual activity [5].

Do not take vardenafil more than once a day, even if the first dose doesn't seem to work. If vardenafil isn't effective for you, speak to your prescriber – they may adjust the dose or suggest a different ED treatment. Never take a double dose of clindamycin if you miss one; just take the next dose as normal.

Watch for side effects from either medicine. Common side effects of vardenafil include headache, flushing, indigestion and nasal congestion [5]. Clindamycin can cause diarrhoea, nausea and stomach pain. If you develop severe or persistent diarrhoea (especially with blood or mucus) while taking clindamycin, contact your GP urgently, as this can be a sign of a serious bowel infection. If you get chest pain during sex, stop and seek urgent medical help – do not take nitrates if you've used vardenafil in the past 24 hours [5].

When to Seek Urgent Help

Seek immediate medical attention if you experience an erection lasting more than four hours (priapism), sudden loss of vision or hearing, or chest pain during sexual activity. These are rare but serious side effects of vardenafil that need urgent treatment [5].

If you develop signs of an allergic reaction to either medicine (such as rash, swelling of the face or throat, or difficulty breathing), call 999 or go to A&E straight away. Always keep your prescriber or GP informed of any new symptoms or concerns while taking any prescription medicine.

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 attention
• Chest pain during sexual activity – stop and call 999; do not take nitrates
• Severe or bloody diarrhoea while taking clindamycin – contact your GP urgently
• Signs of allergic reaction (rash, swelling, difficulty breathing) – call 999

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