Tadalafil and Nifedipine: Can They Be Taken Together?

Tadalafil and Nifedipine: Understanding the Interaction

Published: 23 October 2026

Many men taking nifedipine for high blood pressure or angina wonder whether tadalafil and nifedipine can be taken together safely. The good news is that this combination is not absolutely contraindicated, but it does require careful prescriber assessment because both medicines can lower blood pressure. Understanding how these medicines interact and what your doctor or pharmacist checks will help you use tadalafil safely and effectively.

What Is Tadalafil and How Does It Work?

Tadalafil is a prescription medicine used to treat erectile dysfunction (ED) in men [4]. It belongs to a group of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused. Tadalafil is the active ingredient in branded Cialis and is available as a lower-cost generic.

Tadalafil comes in two forms: on-demand tablets (usually 10mg or 20mg) taken at least 30 minutes before sexual activity, with effects lasting up to 36 hours, and daily low-dose tablets (2.5mg or 5mg) for men who prefer spontaneity [4]. Unlike some other ED treatments, tadalafil's long duration means you don't need to time sex as precisely. However, it only works when you are sexually stimulated—it does not cause an automatic erection.

At Cured Pharmacy, tadalafil is available after an online consultation reviewed by a UK prescriber. The prescriber will check your medical history, current medicines (including nifedipine), and blood pressure to ensure tadalafil is safe and appropriate for you.

What Is Nifedipine and Why Is It Prescribed?

Nifedipine is a calcium channel blocker prescribed to treat high blood pressure (hypertension) and certain types of chest pain called angina. It works by relaxing and widening blood vessels, which lowers blood pressure and reduces the heart's workload. Nifedipine is usually taken once or twice daily, depending on the formulation (immediate-release or modified-release).

Because nifedipine lowers blood pressure, your doctor will have prescribed it to protect your heart and blood vessels from the long-term damage caused by hypertension. Good blood pressure control reduces your risk of heart attack, stroke, and kidney disease. Many men with high blood pressure also experience erectile dysfunction, partly because the same blood vessel changes that raise blood pressure can affect blood flow to the penis [1].

If you have been prescribed nifedipine, it is important to take it regularly as directed, even if you feel well. Do not stop or change your dose without speaking to your GP or prescriber, as this can cause your blood pressure to rise suddenly.

Can You Take Tadalafil and Nifedipine Together?

Yes, tadalafil and nifedipine can be taken together, but only under medical supervision and after a thorough prescriber review. This combination is not absolutely contraindicated (unlike tadalafil with nitrates, which must never be combined), but both medicines lower blood pressure, so there is a risk that taking them together could cause your blood pressure to drop too much, leading to dizziness, light-headedness, or fainting.

The interaction occurs because tadalafil also has a mild blood-pressure-lowering effect, even though it is primarily used for erectile dysfunction [4]. When combined with nifedipine, the overall drop in blood pressure can be more pronounced, especially when you stand up quickly (a condition called postural hypotension). This is why your prescriber will carefully assess your current blood pressure, the dose of nifedipine you take, and any other medicines you use.

In most cases, men who are stable on nifedipine and have well-controlled blood pressure can use tadalafil safely, often starting at a lower dose (such as 10mg on-demand or 2.5mg daily) to minimise the risk [4]. Your prescriber may also advise you to monitor for symptoms such as dizziness or light-headedness, particularly when you first start treatment or if your nifedipine dose changes.

How the Interaction Works in Plain English

Both nifedipine and tadalafil relax the smooth muscle in blood vessel walls, which widens the vessels and lowers blood pressure. Nifedipine does this by blocking calcium channels, while tadalafil works by inhibiting an enzyme called PDE5. Although they act through different mechanisms, the end result—wider blood vessels and lower blood pressure—is similar. When taken together, these effects can add up, so your prescriber must ensure your blood pressure will not fall to an unsafe level.

What Your Prescriber Checks Before Approving Tadalafil

When you request tadalafil through Cured Pharmacy's online consultation, the UK prescriber will review your full medical history and current medicines, including nifedipine. They will check your most recent blood pressure readings to ensure they are stable and not too low. If your blood pressure is already on the lower side, or if you take multiple blood-pressure-lowering medicines, the prescriber may recommend a lower starting dose of tadalafil or advise against it altogether.

The prescriber will also ask about any symptoms you have experienced, such as dizziness when standing, fainting episodes, or chest pain. They will check whether you have any conditions that make sexual activity inadvisable, such as recent heart attack or stroke, unstable angina, or severe heart failure [2]. If you take other medicines that interact with tadalafil—such as alpha-blockers (e.g. doxazosin, tamsulosin) or potent CYP3A4 inhibitors (e.g. ritonavir, ketoconazole)—the prescriber will adjust the dose or recommend an alternative.

It is essential to list all your current medicines accurately during the consultation, including over-the-counter products and supplements. Never take tadalafil if you also use nitrates (GTN spray, isosorbide mononitrate), nicorandil, riociguat, or recreational drugs called poppers, as these combinations can cause a dangerous drop in blood pressure [4].

Practical Advice for Taking Tadalafil with Nifedipine

If your prescriber approves tadalafil, take it exactly as directed. For on-demand tadalafil (10mg or 20mg), take one tablet at least 30 minutes before sexual activity, and do not take more than one dose in 24 hours [4]. For daily tadalafil (2.5mg or 5mg), take one tablet at the same time each day, regardless of when you plan to have sex. Swallow the tablet whole with water; you can take it with or without food.

Monitor yourself for signs of low blood pressure, especially in the first few days of treatment. Symptoms include dizziness, light-headedness (particularly when standing up), feeling faint, or unusual tiredness. If you experience these, sit or lie down until you feel better, and contact your GP or prescriber for advice. Avoid drinking large amounts of alcohol, as this can worsen the blood-pressure-lowering effect and make erectile dysfunction worse [1].

Continue taking your nifedipine as prescribed by your GP. Do not stop or reduce your blood pressure medicine to 'make room' for tadalafil, as this can cause your blood pressure to rise dangerously. If you have any concerns about your blood pressure or how your medicines are working together, speak to your GP or pharmacist. They may arrange a blood pressure check or adjust your treatment plan.

When to Seek Medical Advice

Seek urgent medical help (call 999 or go to A&E) if you experience chest pain during or after sex, an erection lasting more than four hours (priapism), or sudden loss of vision or hearing after taking tadalafil [4]. Contact your GP or prescriber promptly if you have persistent dizziness, fainting, or any other new or worsening symptoms after starting tadalafil.

Other Blood Pressure Medicines and Tadalafil Interactions

Nifedipine is just one of many blood pressure medicines, and the interaction with tadalafil varies depending on the class of drug. Calcium channel blockers (such as amlodipine, diltiazem, and verapamil) work similarly to nifedipine and can also add to tadalafil's blood-pressure-lowering effect. ACE inhibitors (e.g. ramipril, lisinopril) and angiotensin receptor blockers (e.g. losartan, candesartan) may also cause a modest additional drop in blood pressure when combined with tadalafil, but this is usually manageable.

Alpha-blockers (e.g. doxazosin, tamsulosin, alfuzosin) require special caution. These medicines are used for high blood pressure or prostate symptoms, and they can interact more significantly with tadalafil, increasing the risk of dizziness and fainting. If you take an alpha-blocker, your prescriber will usually recommend starting tadalafil at the lowest dose and ensuring you are stable on the alpha-blocker first [4].

Beta-blockers (e.g. bisoprolol, atenolol) and diuretics (e.g. bendroflumethiazide, furosemide) generally have a lower risk of interaction with tadalafil, but you must still declare them during your consultation. Your prescriber will assess the overall picture—your blood pressure, the number and type of medicines you take, and your general health—to decide whether tadalafil is safe and what dose is appropriate.

Medicines You Must Never Take with Tadalafil

Do not take tadalafil if you use nitrates (GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational nitrites (poppers). These combinations can cause a severe and potentially life-threatening drop in blood pressure [4]. Also, do not take tadalafil alongside another PDE5 inhibitor (such as sildenafil or vardenafil), as this increases the risk of side effects without improving effectiveness.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 23 October 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 23 October 2026]
3. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 23 October 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.

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