Tadalafil and Domperidone: Can You Take Them Together?

Tadalafil and Domperidone: Understanding the Interaction

Published: 20 October 2026

Many men taking tadalafil and domperidone together wonder whether the combination is safe. Tadalafil is a prescription medicine used to treat erectile dysfunction (ED), while domperidone is prescribed for nausea and bloating. Although no major direct interaction between these two medicines is commonly reported in standard references, both can affect your heart rhythm and blood pressure, so your prescriber will carefully review your full medical history and current medicines during your consultation [4][12].

What is tadalafil and how does it work?

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK to treat erectile dysfunction. It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused [4]. Tadalafil is the active ingredient in branded Cialis and is also available as a generic medicine.

Tadalafil is available in two dosing options: on-demand tablets (10 mg or 20 mg) taken at least 30 minutes before sexual activity, with effects lasting up to 36 hours, and daily tablets (2.5 mg or 5 mg) taken once a day regardless of when you plan to have sex [4]. All PDE5 inhibitors, including tadalafil, require sexual stimulation to work—they do not cause an automatic erection.

At Cured Pharmacy, tadalafil is available on prescription after an online consultation reviewed by a UK-registered prescriber. Common side effects include headache, indigestion, back pain, and flushing. Tadalafil is not suitable for everyone, particularly men taking nitrates, nicorandil, riociguat, or those with certain heart conditions [4][12].

What is domperidone and why is it prescribed?

Domperidone is a prescription medicine used to relieve symptoms of nausea and vomiting, and to treat bloating and discomfort caused by delayed stomach emptying. It works by blocking dopamine receptors in the gut and in an area of the brain that controls vomiting, helping the stomach to empty more efficiently.

In the UK, domperidone is typically prescribed for short-term use (usually no more than one week) because of concerns about potential heart rhythm disturbances, particularly at higher doses or in people with existing heart conditions. The usual adult dose is 10 mg up to three times daily.

Because domperidone can, in rare cases, prolong the QT interval on an ECG (a measure of the heart's electrical activity), it is not recommended for people with certain heart rhythm problems or those taking other medicines that also affect heart rhythm. Your GP or prescriber will consider your full medical history before prescribing domperidone.

Do tadalafil and domperidone interact with each other?

There is no major direct pharmacological interaction commonly reported between tadalafil and domperidone in standard UK prescribing references [4][12]. This means that the two medicines do not significantly interfere with each other's breakdown or action in the body in a way that would make either medicine more or less effective.

However, both medicines can have effects on the cardiovascular system. Tadalafil can lower blood pressure slightly, which is usually well tolerated but can occasionally cause dizziness or light-headedness [4]. Domperidone, although primarily used for digestive symptoms, has been associated with a small increased risk of heart rhythm disturbances (QT prolongation and serious arrhythmias), particularly in people over 60, those with heart disease, or when taken at doses above 30 mg per day.

Because of these individual cardiovascular effects, your prescriber will carefully assess your overall health, current medicines, and any heart conditions during your consultation. If you are already taking domperidone and are considering tadalafil for ED, or vice versa, it is essential to declare both medicines so that your prescriber can make an informed decision about whether the combination is appropriate for you [12].

Why your prescriber needs to know about both medicines

Even when two medicines do not have a direct interaction, your prescriber must consider the cumulative effect on your heart and blood pressure. For example, if you have an underlying heart condition, the combination of a medicine that lowers blood pressure (tadalafil) and one that may affect heart rhythm (domperidone) requires careful evaluation. Your prescriber will review your medical history, current symptoms, and any other medicines you take to ensure the combination is safe for you.

What does your prescriber check before approving tadalafil and domperidone together?

During your online consultation at Cured Pharmacy, the prescriber will ask detailed questions about your current medicines, including domperidone, and your medical history. They will check for any conditions that might make tadalafil unsuitable, such as recent heart attack or stroke, unstable angina, severe heart failure, very low blood pressure, or a history of sudden vision loss [4][12].

The prescriber will also review whether you have any heart rhythm problems or risk factors for QT prolongation, which is particularly relevant if you are taking domperidone. They will consider your age, other cardiovascular medicines (such as beta-blockers or other blood-pressure-lowering drugs), and whether you are taking any other medicines that might interact with tadalafil, such as alpha-blockers or potent CYP3A4 inhibitors [4].

If the prescriber determines that the combination of tadalafil and domperidone is appropriate for you, they may recommend starting on the lowest effective dose of tadalafil and monitoring for any unusual symptoms such as dizziness, palpitations, or chest discomfort. You should never take tadalafil with nitrates, nicorandil, riociguat, poppers, or another PDE5 inhibitor, as these combinations can cause a dangerous drop in blood pressure [4][12].

Practical advice for taking tadalafil and domperidone safely

If your prescriber approves the use of tadalafil while you are taking domperidone, follow their instructions carefully. Take each medicine exactly as prescribed, and do not exceed the recommended dose. Domperidone is usually prescribed for short-term use only, so if your symptoms improve, your GP may stop the domperidone, which may simplify your treatment plan.

Be aware of potential side effects from both medicines. Common side effects of tadalafil include headache, indigestion, back pain, and flushing [4]. Domperidone can occasionally cause dry mouth or, rarely, heart rhythm disturbances. If you experience dizziness, light-headedness, palpitations, or chest pain, stop taking the medicines and seek medical advice promptly.

Avoid drinking large amounts of alcohol when taking tadalafil, as alcohol can worsen erectile dysfunction and add to the blood-pressure-lowering effect, increasing the risk of dizziness. Grapefruit juice can raise tadalafil levels in the blood, so it is best avoided. Always inform any healthcare professional you see—whether your GP, a hospital doctor, or a pharmacist—that you are taking both tadalafil and domperidone, so they can check for any additional interactions with new medicines [12].

When to seek urgent medical 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. If you develop severe dizziness, fainting, or a rapid or irregular heartbeat, call 999 or go to A&E. These symptoms are rare but require urgent assessment.

Other medicines and lifestyle factors to consider with tadalafil

In addition to domperidone, several other medicines can interact with tadalafil. Never take tadalafil with nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, or recreational drugs known as poppers, as these combinations can cause a dangerous fall in blood pressure [4]. Do not take tadalafil with another PDE5 inhibitor such as sildenafil or vardenafil.

Alpha-blockers (such as doxazosin or tamsulosin, used for prostate symptoms or high blood pressure) can also lower blood pressure, so if you take an alpha-blocker, your prescriber will usually start you on the lowest dose of tadalafil and ensure you are stable on the alpha-blocker first [4]. Potent CYP3A4 inhibitors (such as ritonavir, ketoconazole, or clarithromycin) can raise tadalafil levels, requiring dose adjustments [4][12].

Lifestyle factors also matter. Erectile dysfunction can be an early warning sign of cardiovascular disease or diabetes, so if you have new or worsening ED, see your GP for a full health check [1][2]. Stopping smoking, reducing alcohol, maintaining a healthy weight, and exercising regularly can all improve erectile function and overall health. At Cured Pharmacy, our online consultation ensures that a UK prescriber reviews your full medical history and current medicines before approving any ED treatment.

Why you should not stop domperidone without advice

If you are taking domperidone for ongoing symptoms, do not stop it suddenly without speaking to your GP, even if you start tadalafil. Your GP prescribed domperidone for a reason, and stopping it abruptly may cause your symptoms to return. If you have concerns about taking both medicines together, discuss them with your GP or the prescriber during your consultation.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 20 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 20 October 2026]
3. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 20 October 2026]
4. Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 20 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.