Tadalafil and Zolmitriptan: Can You Take Them Together?

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Tadalafil and Zolmitriptan: Understanding the Interaction

Published: 27 October 2026

If you're prescribed tadalafil for erectile dysfunction and zolmitriptan for migraines, you may wonder whether tadalafil and zolmitriptan can be taken together safely. The good news is that no major direct interaction between these two medicines is commonly reported in standard references, but both can affect blood pressure, so your prescriber will review your full medical history and current medicines during your consultation [3][4]. This page explains what each medicine does, what checks are made, and the practical steps to use them safely.

What is tadalafil and how does it work?

Tadalafil is a prescription medicine used to treat erectile dysfunction (ED) in men. 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 [4]. Tadalafil does not cause an erection on its own—sexual stimulation is still needed.

Tadalafil is available in two main 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) taken once a day to allow spontaneity [4]. The branded version is known as Cialis, but generic tadalafil is widely available and works in exactly the same way.

Common side effects include headache, indigestion, back pain, muscle aches, flushing, and nasal congestion [4]. These are usually mild and temporary. Tadalafil is not suitable for everyone, particularly men taking nitrates, nicorandil, or riociguat, or those for whom sexual activity is inadvisable due to heart conditions [4].

What is zolmitriptan and how does it work?

Zolmitriptan is a prescription medicine used to treat acute migraine attacks. It belongs to a class of medicines called triptans, which work by narrowing blood vessels around the brain and blocking pain pathways [12]. Zolmitriptan is taken at the start of a migraine headache and can help relieve the pain, nausea, and sensitivity to light and sound that often accompany migraines.

Zolmitriptan is available as tablets (2.5mg or 5mg), orodispersible tablets that dissolve on the tongue, and a nasal spray. It usually starts to work within 30 minutes to an hour. If the migraine returns or only partially improves, a second dose may be taken after at least two hours, but you should not exceed the maximum daily dose recommended by your prescriber [12].

Common side effects include tingling sensations, warmth or heaviness in parts of the body, dizziness, drowsiness, and dry mouth [12]. Zolmitriptan can temporarily raise blood pressure and is not suitable for people with certain heart conditions, uncontrolled high blood pressure, or a history of stroke or transient ischaemic attack (TIA).

Can you take tadalafil and zolmitriptan together?

No major direct interaction between tadalafil and zolmitriptan is commonly reported in standard UK prescribing references [3][4][12]. This means that, in general, taking both medicines is not expected to cause a dangerous reaction or significantly alter how either medicine works. However, both medicines can affect your cardiovascular system—tadalafil lowers blood pressure slightly, while zolmitriptan can temporarily raise it—so your prescriber will carefully review your medical history and current medicines during your consultation.

It is important to declare all your current medicines, including over-the-counter treatments and supplements, when you request tadalafil. Your prescriber will check for any conditions or other medicines that might make the combination unsuitable for you. For example, if you have underlying heart disease or uncontrolled high blood pressure, the prescriber may need to adjust your treatment or recommend an alternative [1][2].

Never start, stop, or change the dose of any prescribed medicine without consulting your doctor or pharmacist. If you experience unusual symptoms such as severe headache, chest pain, dizziness, or palpitations after taking both medicines, seek medical advice promptly.

Why your prescriber reviews your full medication list

During your online consultation for tadalafil at Cured Pharmacy, you will be asked to list all your current medicines, including those for migraines like zolmitriptan. This is because some medicines can interact with tadalafil in ways that are potentially dangerous—for example, nitrates, nicorandil, and riociguat must never be taken with tadalafil, as the combination can cause a severe drop in blood pressure [3][4]. Other medicines, such as alpha-blockers or potent CYP3A4 inhibitors, may require a lower starting dose of tadalafil or careful monitoring. Your prescriber will ensure that tadalafil is safe and appropriate for you based on your individual circumstances.

What your prescriber checks before approving tadalafil and zolmitriptan

When you request tadalafil through an online consultation, the prescriber will review your full medical history, including any cardiovascular conditions, blood pressure, history of stroke or heart attack, and current medicines [2]. If you are taking zolmitriptan, the prescriber will check whether you have any conditions that might make tadalafil unsuitable, such as recent cardiovascular events, severe heart failure, or very low blood pressure.

The prescriber will also confirm that you are not taking any medicines that are absolutely contraindicated with tadalafil, such as nitrates (GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites) [3][4]. If you are on alpha-blockers for prostate symptoms or high blood pressure, the prescriber may start you on the lowest dose of tadalafil and advise you to take it at a different time of day to your alpha-blocker to reduce the risk of dizziness.

If you are taking medicines that affect how the liver breaks down tadalafil—such as ritonavir, cobicistat, ketoconazole, itraconazole, or clarithromycin—the prescriber may reduce the maximum dose of tadalafil or choose a different ED treatment [4]. The prescriber will also ask about alcohol intake, as heavy drinking can worsen ED and add to the blood-pressure-lowering effect of tadalafil.

Practical advice for taking tadalafil and zolmitriptan safely

If your prescriber approves tadalafil and you are already taking zolmitriptan for migraines, there are some practical steps you can take to use both medicines safely. First, take each medicine exactly as prescribed—do not exceed the recommended dose of either medicine, and do not take tadalafil more than once in 24 hours [4]. If you are using on-demand tadalafil, take it at least 30 minutes before sexual activity; if you are on daily tadalafil, take it at the same time each day.

Monitor how you feel, especially when you first start taking tadalafil or if your dose is changed. If you experience dizziness, lightheadedness, or fainting, sit or lie down and avoid driving or operating machinery until you feel better. If these symptoms are severe or persistent, contact your doctor. If you develop a severe headache, chest pain, sudden vision or hearing loss, or an erection lasting more than four hours, seek urgent medical help [3][4].

Avoid drinking large amounts of alcohol when taking tadalafil, as this can increase the risk of dizziness and make it harder to get an erection [4]. Grapefruit juice can raise the level of tadalafil in your blood, so it is best to avoid it. If you need to take a new medicine or your migraine treatment changes, inform your doctor or pharmacist so they can check for interactions.

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), sudden loss of vision in one or both eyes, or sudden decrease or loss of hearing [3][4]. Contact your GP or pharmacist promptly if you have severe or persistent dizziness, fainting, palpitations, or a severe headache that does not respond to your usual migraine treatment. If you are unsure whether a symptom is serious, it is always safer to seek advice.

Other medicines that interact with tadalafil and zolmitriptan

While tadalafil and zolmitriptan do not have a major direct interaction, both medicines can interact with other treatments. Tadalafil must never be taken with nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational 'poppers', as the combination can cause a dangerous drop in blood pressure [3][4]. Do not take tadalafil with another PDE5 inhibitor (such as sildenafil or vardenafil) at the same time.

Zolmitriptan should not be taken with other triptans or ergotamine-type medicines on the same day, as this can increase the risk of side effects [12]. If you are taking certain antidepressants (such as SSRIs or SNRIs), there is a small risk of a rare condition called serotonin syndrome when combined with triptans, so your doctor will monitor you carefully. Zolmitriptan can also interact with some medicines for depression (MAOIs) and should not be used within two weeks of stopping an MAOI.

Alpha-blockers (such as doxazosin, tamsulosin, or alfuzosin) can interact with tadalafil, increasing the risk of low blood pressure and dizziness [3][4]. If you are on an alpha-blocker, your prescriber will usually start you on the lowest dose of tadalafil and may advise you to take it at a different time of day. Potent CYP3A4 inhibitors (such as ritonavir, cobicistat, ketoconazole, itraconazole, or clarithromycin) can raise the level of tadalafil in your blood, so your prescriber may reduce the maximum dose [4]. CYP3A4 inducers (such as rifampicin, carbamazepine, phenytoin, or St John's wort) can make tadalafil less effective.

Declaring all your medicines during your consultation

When you complete your online consultation for tadalafil at Cured Pharmacy, you will be asked to list all your current medicines, including prescription medicines, over-the-counter treatments, herbal remedies, and supplements. This is essential for your safety, as it allows the prescriber to check for interactions and ensure that tadalafil is suitable for you. Do not stop or change any prescribed medicine without consulting your doctor or pharmacist first. If you start a new medicine after being prescribed tadalafil, inform your doctor or pharmacist so they can check for interactions.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 27 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 27 October 2026]
3. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 27 October 2026]
4. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 27 October 2026]
5. Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 27 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.