Tadalafil and Mebeverine: Can You Take Them Together?

Tadalafil and Mebeverine: Understanding the Interaction

Published: 23 October 2026

Many men wonder whether tadalafil and mebeverine can be taken together safely. Tadalafil (often known by the brand name Cialis) is a prescription medicine for erectile dysfunction, while mebeverine (Colofac) is commonly used to relieve symptoms of irritable bowel syndrome (IBS). The good news is that no major interaction between tadalafil and mebeverine is commonly reported in clinical practice, but your prescriber will still review all your current medicines during your consultation to ensure the combination is suitable for you personally.

What is tadalafil and how does it work?

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK for treating erectile dysfunction (ED) [4]. It works by relaxing the blood vessels in the penis, which allows more blood to flow into the area when you are sexually aroused. This increased blood flow helps you achieve and maintain an erection suitable for sexual activity [1].

Tadalafil is available in two main forms: on-demand tablets (usually 10 mg or 20 mg) taken at least 30 minutes before sex, with effects lasting up to 36 hours, and daily low-dose tablets (2.5 mg or 5 mg) taken every day [4]. Unlike some other ED treatments, tadalafil's long duration of action means you don't need to time sex as precisely. However, sexual stimulation is still required for the medicine to work – it won't cause an automatic erection [2].

Common side effects include headache, indigestion, back pain, muscle aches, and flushing. These are usually mild and temporary. Tadalafil must not be taken with nitrates (such as GTN spray), nicorandil, riociguat, or recreational drugs called 'poppers', as this combination can cause a dangerous drop in blood pressure [4].

What is mebeverine and why is it prescribed?

Mebeverine is an antispasmodic medicine commonly prescribed for irritable bowel syndrome (IBS) and other conditions that cause painful spasms in the gut. It works by relaxing the smooth muscle in the wall of the intestine, which helps to relieve abdominal cramps, bloating, and discomfort. Mebeverine is available as standard tablets (135 mg) taken three times a day, or as modified-release capsules (200 mg) taken twice daily.

Unlike some older antispasmodic medicines, mebeverine does not have significant anticholinergic effects, which means it is less likely to cause side effects such as dry mouth, blurred vision, or constipation. It is generally well tolerated and can be used long-term to manage IBS symptoms. Mebeverine is usually taken about 20 minutes before meals for best effect.

Mebeverine works locally in the gut and is not known to have major interactions with most other medicines. It does not significantly affect blood pressure, heart rate, or the enzymes in the liver that break down other drugs. This makes it a relatively safe choice for people who need to take multiple medicines for different conditions.

Can you take tadalafil and mebeverine together?

There is no commonly reported major interaction between tadalafil and mebeverine. These two medicines work in different parts of the body and through different mechanisms: tadalafil acts on blood vessels in the penis, while mebeverine acts on smooth muscle in the gut. Neither medicine is known to significantly affect the way the other is absorbed, broken down, or removed from the body.

However, it is essential to declare all your current medicines – including over-the-counter treatments, herbal remedies, and supplements – when you request tadalafil. Your prescriber or pharmacist will review your full medication list during the online consultation to check for any potential issues specific to your situation. This is a standard safety step for all prescription medicines.

While tadalafil and mebeverine are not known to interact directly, tadalafil does have important interactions with other medicines, particularly nitrates, alpha-blockers, and certain antifungal or HIV medicines [4]. Your prescriber will check for these during your consultation. If you are taking mebeverine for IBS and also have other health conditions that require additional medicines, it is especially important to provide a complete and accurate list.

What your prescriber checks

During your consultation, the prescriber will ask about all your current medicines, including mebeverine, to ensure tadalafil is safe for you. They will also check your blood pressure, cardiovascular health, and any other conditions that might affect whether tadalafil is suitable. Even though mebeverine itself does not interact with tadalafil, the prescriber needs to understand your overall health picture.

If you have IBS and are also taking other medicines – for example, medicines for high blood pressure, diabetes, or depression – the prescriber will review each one. Some medicines can affect how tadalafil works or increase the risk of side effects. This thorough check is part of the safe prescribing process and helps ensure the treatment is right for you.

How tadalafil and mebeverine work in your body

Understanding how each medicine works can help you see why they are unlikely to interfere with each other. Tadalafil is a selective inhibitor of an enzyme called phosphodiesterase type 5 (PDE5), which is found mainly in the smooth muscle of blood vessels in the penis and lungs [4]. By blocking this enzyme, tadalafil allows a natural chemical called cyclic GMP to build up, which relaxes the blood vessels and increases blood flow when you are sexually aroused.

Mebeverine, on the other hand, is an antispasmodic that acts directly on the smooth muscle in the gut wall. It does not work through the same enzyme pathways as tadalafil and does not have significant effects on blood vessels elsewhere in the body. Mebeverine is poorly absorbed from the gut and is largely broken down in the intestine before it reaches the bloodstream, which means it has minimal systemic effects.

Because these two medicines target different organs and use different mechanisms, they do not compete for the same enzymes or receptors in the body. Tadalafil is mainly broken down in the liver by an enzyme called CYP3A4, while mebeverine is metabolised locally in the gut. This separation in how they are processed further reduces the chance of a clinically significant interaction.

Practical advice when taking tadalafil and mebeverine

If you are prescribed tadalafil while already taking mebeverine for IBS, you can usually take both medicines as directed without needing to adjust the timing. Mebeverine is typically taken about 20 minutes before meals, while on-demand tadalafil is taken at least 30 minutes before sexual activity. There is no need to separate the doses by a specific time interval, as the medicines do not interfere with each other's absorption or action.

Continue to take your mebeverine exactly as prescribed by your doctor to manage your IBS symptoms. Do not stop or change your mebeverine dose because you are starting tadalafil – the two treatments serve different purposes and can be used together. If you experience any new or unusual symptoms after starting tadalafil, contact your prescriber or pharmacist for advice.

Remember that tadalafil requires sexual stimulation to work and will not cause an erection on its own. Common side effects such as headache or indigestion are usually mild and not related to mebeverine. If you have any concerns about how the medicines are working together, or if you notice any unexpected effects, speak to a healthcare professional. Always read the patient information leaflet that comes with each medicine.

Lifestyle tips for managing IBS and ED

Both IBS and erectile dysfunction can be influenced by lifestyle factors. Stress, anxiety, and poor sleep can worsen IBS symptoms and also contribute to ED [1][2]. Finding ways to manage stress – such as regular exercise, relaxation techniques, or talking therapies – may help with both conditions.

A healthy diet that supports gut health can also benefit overall wellbeing and cardiovascular health, which is important for erectile function. Limiting alcohol is particularly relevant if you are taking tadalafil, as heavy drinking can make ED worse and add to the blood-pressure-lowering effect of the medicine [4]. Staying hydrated, eating regular meals, and avoiding known IBS triggers can help you get the most from your mebeverine treatment.

When to seek medical advice about tadalafil and mebeverine

While tadalafil and mebeverine can generally be taken together, you should seek urgent medical help if you experience certain warning signs. If you develop chest pain during or after sex, call 999 immediately. Do not take any nitrate medicine (such as GTN spray) if you have used tadalafil in the past 48 hours, as this can cause a dangerous drop in blood pressure [4].

Other urgent warning signs include an erection lasting more than four hours (priapism), sudden loss of vision in one or both eyes, or sudden decrease or loss of hearing. These are rare but serious side effects that require immediate medical attention. If you experience severe dizziness, fainting, or an allergic reaction (such as swelling of the face, lips, or throat, or difficulty breathing), seek emergency help.

For non-urgent concerns – such as troublesome side effects from tadalafil, worsening IBS symptoms, or questions about your medicines – contact your GP or pharmacist. If you are starting a new medicine prescribed by another doctor or buying an over-the-counter treatment, check with your pharmacist whether it is safe to take alongside tadalafil. Never stop a prescribed medicine without professional advice, and always inform every healthcare professional you see about all the medicines you are taking, including mebeverine and tadalafil.

Reporting side effects

If you experience any side effect that concerns you, whether or not it is listed in the patient information leaflet, you can report it via the Yellow Card Scheme at www.mhra.gov.uk/yellowcard or by searching for 'MHRA Yellow Card' in the Google Play or Apple App Store. Reporting side effects helps improve the safety information available about medicines.

Your prescriber and pharmacist are also available to discuss any side effects or concerns. At Cured Pharmacy, you can contact the clinical team for advice if you have questions about your treatment. Keeping an open line of communication with your healthcare providers helps ensure you get the best and safest care.

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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