Vardenafil and Nifedipine: Can You Take Them Together?

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Key takeaways

• Vardenafil and nifedipine can usually be taken together with careful prescribing and monitoring.
• Both medicines lower blood pressure, so the combination may cause dizziness or light-headedness.
• Your prescriber will start you on a low dose of vardenafil and check your blood pressure control.
• Nifedipine is not a nitrate—nitrates are absolutely contraindicated with vardenafil.
• Seek urgent help for chest pain, erection lasting over 4 hours, or sudden vision or hearing loss.

What Are Vardenafil and Nifedipine?

Vardenafil is a prescription medicine used to treat erectile dysfunction (ED). It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis during sexual stimulation, allowing increased blood flow that helps achieve and maintain an erection [3][5]. Vardenafil is available in 5mg, 10mg, and 20mg tablets and is usually taken about 25 to 60 minutes before sexual activity. The effect can last for several hours, but you should not take it more than once in 24 hours.

Nifedipine is a calcium channel blocker prescribed to treat high blood pressure (hypertension) and angina (chest pain caused by reduced blood flow to the heart). It works by relaxing and widening blood vessels, which lowers blood pressure and reduces the heart's workload [2]. Nifedipine is usually taken as a modified-release tablet once or twice daily, and it is important to take it regularly as prescribed to keep your blood pressure controlled.

Both medicines affect blood vessels and blood pressure, which is why their interaction needs careful consideration. However, unlike nitrates, nicorandil, or riociguat—which must never be taken with vardenafil—nifedipine is not an absolute contraindication. The combination can be managed safely with appropriate medical supervision and dose adjustments.

How Do Vardenafil and Nifedipine Interact?

The interaction between vardenafil and nifedipine centres on their combined effect on blood pressure. Both medicines cause blood vessels to relax and widen, which lowers blood pressure. When taken together, this blood-pressure-lowering effect can be additive, meaning the combined drop in blood pressure may be greater than with either medicine alone [5]. For most men whose blood pressure is well controlled on nifedipine, this additive effect is manageable, but it does increase the risk of symptoms such as dizziness, light-headedness, or fainting, particularly when standing up quickly.

Vardenafil is also broken down in the body by liver enzymes, particularly one called CYP3A4. Nifedipine is processed by the same enzyme system, but it is not a potent inhibitor, so it does not significantly raise vardenafil levels in the blood [5]. This means the interaction is primarily about blood pressure rather than drug levels. The risk is higher if you are taking other blood-pressure medicines alongside nifedipine, if your blood pressure is not well controlled, or if you start vardenafil at a higher dose.

It is important to understand that this interaction does not mean you cannot use vardenafil if you take nifedipine. Many men on calcium channel blockers like nifedipine use PDE5 inhibitors successfully. The key is that your prescriber will assess your individual situation, check your blood pressure control, review all your medicines, and may start you on a lower dose of vardenafil to minimise the risk of side effects.

Why Nifedipine Is Different from Nitrates

It is crucial to distinguish nifedipine from nitrates such as GTN spray, isosorbide mononitrate, or nicorandil. Nitrates and nicorandil are absolute contraindications with vardenafil—you must never take them together because the combination can cause a sudden, severe, and potentially life-threatening drop in blood pressure [5]. Nifedipine, as a calcium channel blocker, does lower blood pressure, but the effect is much less dramatic and can be managed with careful prescribing. Always tell your prescriber about every medicine you take, including those for angina or heart conditions, so they can assess safety accurately.

At a glance

What Your Prescriber Checks Before Prescribing Vardenafil and Nifedipine

Before prescribing vardenafil to someone taking nifedipine, a UK prescriber will carry out a thorough assessment to ensure the combination is safe for you. They will ask about your current blood pressure readings, how well controlled your blood pressure is, and whether you have experienced any dizziness or fainting episodes. They will also review your full medication list to check for other medicines that might interact with vardenafil, such as alpha-blockers, other blood-pressure tablets, or medicines that affect liver enzymes [2][5].

Your prescriber will ask about your cardiovascular health, including any history of heart attack, stroke, angina, or heart failure. Sexual activity increases the heart's workload, so it is important to ensure your heart is healthy enough for sex. If you have unstable angina, severe heart failure, or have had a recent heart attack or stroke, vardenafil may not be suitable [5]. Your prescriber will also check for other conditions that might affect the safety of vardenafil, such as low blood pressure (hypotension), liver or kidney problems, or a history of priapism (prolonged erection).

If the prescriber decides vardenafil is appropriate, they will usually start you on the lowest effective dose—often 5mg or 10mg—to minimise the risk of a significant blood pressure drop. They may advise you to take vardenafil at a different time of day from your nifedipine dose, or to monitor how you feel after the first dose, particularly when standing up. This cautious approach helps ensure that the combination is both safe and effective for you.

Practical Advice for Taking Vardenafil with Nifedipine

If your prescriber approves vardenafil while you are taking nifedipine, there are several practical steps you can take to use the medicines safely. First, always start with the lowest prescribed dose of vardenafil and see how your body responds before considering a higher dose. 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, even if the first dose does not seem effective.

Be mindful of symptoms that might indicate your blood pressure has dropped too much. These include dizziness, light-headedness, fainting, blurred vision, or feeling unusually weak or tired. If you experience any of these symptoms, sit or lie down until you feel better, and avoid driving or operating machinery. When you stand up from sitting or lying down, do so slowly to give your body time to adjust. Avoid drinking large amounts of alcohol when taking vardenafil, as alcohol can lower blood pressure further and make ED worse [1][5].

Keep your nifedipine dose regular and do not skip or change it without speaking to your doctor, as consistent blood pressure control is important for your overall health. If you develop chest pain during or after sex, stop the activity and seek medical help immediately. Do not take GTN spray or any nitrate medicine if you have taken vardenafil in the past 24 hours, as this combination is dangerous [5]. Always carry a list of your current medicines, including vardenafil, so that healthcare professionals can make safe decisions in an emergency.

Monitoring and Follow-Up

After starting vardenafil, it is a good idea to monitor your blood pressure at home if you have a monitor, or to have it checked by your GP or pharmacist. If you notice your blood pressure readings are consistently lower than usual, or if you develop new symptoms such as persistent dizziness, contact your prescriber. They may adjust your dose of vardenafil or nifedipine, or review your overall treatment plan. Regular follow-up ensures that both your blood pressure and your ED are managed effectively and safely.

Warning Signs and When to Seek Help with Vardenafil and Nifedipine

While most men tolerate the combination of vardenafil and nifedipine well, it is important to know the warning signs that require urgent medical attention. If you experience chest pain or discomfort during or after sexual activity, stop immediately and seek help. Do not take any nitrate medicine such as GTN spray if you have used vardenafil in the past 24 hours, as this can cause a dangerous drop in blood pressure [5]. Call 999 or go to A&E if the chest pain is severe, does not go away, or is accompanied by shortness of breath, sweating, or nausea.

An erection lasting more than four hours (priapism) is a medical emergency that requires immediate treatment to prevent permanent damage to the penis. If this happens, go to A&E straight away [5]. Sudden loss of vision in one or both eyes, or sudden decrease or loss of hearing (sometimes with ringing in the ears or dizziness), are rare but serious side effects that require urgent medical assessment. Stop taking vardenafil and seek help immediately if you experience these symptoms [5].

Severe dizziness, fainting, or a feeling that you might pass out can indicate that your blood pressure has dropped too low. If you faint or feel extremely unwell, seek medical help. Less urgent but still important side effects include persistent headache, flushing, indigestion, or nasal congestion. These are common with vardenafil and usually mild, but if they are severe or do not improve, speak to your pharmacist or prescriber. Never stop taking nifedipine suddenly without medical advice, as this can cause your blood pressure to rise sharply.

Other Blood Pressure Medicines and Vardenafil Interactions

Nifedipine is just one of many medicines used to treat high blood pressure, and it is helpful to understand how vardenafil interacts with other cardiovascular medicines. Alpha-blockers such as doxazosin, tamsulosin, and alfuzosin, often prescribed for an enlarged prostate, can also lower blood pressure and increase the risk of dizziness when combined with vardenafil [3][5]. If you take an alpha-blocker, your prescriber will ensure you are stable on that medicine before starting vardenafil, and will usually prescribe the lowest dose of the ED treatment.

Other classes of blood pressure medicines, such as ACE inhibitors (e.g. ramipril, lisinopril), angiotensin receptor blockers (e.g. losartan, candesartan), beta-blockers (e.g. bisoprolol, atenolol), and diuretics (e.g. bendroflumethiazide, furosemide), can also add to the blood-pressure-lowering effect of vardenafil. These combinations are generally manageable, but your prescriber will review your full medication list and blood pressure control before prescribing [2]. It is essential to declare every medicine you take, including over-the-counter products and herbal supplements, during your consultation.

Remember that nitrates (GTN spray, isosorbide mononitrate, isosorbide dinitrate), nicorandil, and riociguat are absolute contraindications with all PDE5 inhibitors, including vardenafil. Do not take vardenafil if you use any of these medicines [5]. If you are unsure whether a medicine you take is safe with vardenafil, ask your prescriber or pharmacist. At Cured Pharmacy, every prescription is reviewed by a UK-registered prescriber who checks for interactions and ensures the treatment is safe and appropriate for you.

Grapefruit and Other Considerations

Grapefruit juice can increase the levels of vardenafil in your blood by affecting the CYP3A4 enzyme, which may increase the risk of side effects [5]. It is best to avoid grapefruit and grapefruit juice while taking vardenafil. Heavy alcohol consumption can worsen erectile dysfunction and add to the blood-pressure-lowering effect of both vardenafil and nifedipine, so limit alcohol to moderate amounts [1]. If you are taking any other medicines that affect the CYP3A4 enzyme, such as certain antibiotics or antifungals, tell your prescriber, as dose adjustments may be needed.

When to get urgent help

• Chest pain during or after sex—stop activity and call 999 (do not take nitrates if you have used vardenafil in the past 24 hours)
• Erection lasting more than 4 hours—go to A&E immediately to prevent permanent damage
• Sudden loss of vision or hearing—stop vardenafil and seek urgent medical help
• Severe dizziness, fainting, or feeling you might pass out—seek medical advice
• Severe or persistent headache, shortness of breath, or feeling very unwell—contact your GP or call 111

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