Tadalafil and Fingolimod: Can They Be Taken Together?

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Key takeaways

• No major direct interaction is commonly reported between tadalafil and fingolimod
• Your prescriber will check your cardiovascular health before approving tadalafil
• Continue fingolimod as prescribed; do not stop or change it without specialist advice
• Declare all medicines during your consultation for a safe, personalised assessment
• Seek urgent help for erections lasting over 4 hours or sudden vision or hearing loss

What is tadalafil and fingolimod used for?

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK to treat erectile dysfunction [3][4]. It works by relaxing blood vessels in the penis, allowing increased blood flow when you're sexually aroused. Tadalafil is available as an on-demand treatment (10 mg or 20 mg taken at least 30 minutes before sex, with effects lasting up to 36 hours) or as a daily low-dose tablet (2.5 mg or 5 mg). You may know it by the brand name Cialis, though generic tadalafil is widely available and equally effective.

Fingolimod is an immunomodulating medicine used to treat relapsing forms of multiple sclerosis [12]. It works by preventing certain white blood cells from leaving lymph nodes, which reduces inflammation in the brain and spinal cord. Fingolimod is taken once daily as a capsule, usually at a dose of 0.5 mg. Because it affects immune function and can influence heart rate, especially when you first start treatment, fingolimod requires careful monitoring by your neurologist or specialist.

Both medicines are prescription-only in the UK. If you're already taking fingolimod and wish to start treatment for erectile dysfunction, your prescriber will need to know about all your current medications, including fingolimod, to assess whether tadalafil or another ED treatment is suitable for you.

Is there an interaction between tadalafil and fingolimod?

There is no well-documented pharmacological interaction between tadalafil and fingolimod that would prevent them from being prescribed together [3][4][12]. They work through different mechanisms in the body: tadalafil acts on blood vessels in the penis, while fingolimod modulates immune cells and affects heart rhythm. Neither medicine is known to significantly alter the metabolism or effectiveness of the other.

However, both medicines can have cardiovascular effects that your prescriber must consider. Fingolimod can cause a temporary slowing of your heart rate (bradycardia) when you first start treatment, and it may slightly increase blood pressure over time. Tadalafil, like all PDE5 inhibitors, can lower blood pressure modestly, particularly when combined with other blood-pressure-lowering medicines or alcohol [3][4]. While these effects are usually mild and well-tolerated, your prescriber will want to ensure your heart and blood pressure are stable before recommending tadalafil.

The key point is that your prescriber and pharmacist will review your complete medication list, including fingolimod, during your consultation. They will check for any conditions or other medicines that might make tadalafil unsuitable, such as recent heart problems, very low blood pressure, or medicines that must never be combined with PDE5 inhibitors (nitrates, nicorandil, riociguat, or poppers). If you're stable on fingolimod and have no other contraindications, tadalafil may be an appropriate option for you.

At a glance

What does your prescriber check before recommending tadalafil?

When you request tadalafil through an online consultation at Cured Pharmacy, a UK-registered prescriber will review your medical history and current medications to ensure treatment is safe [2]. They will ask about your cardiovascular health, including any history of heart attack, stroke, angina, heart failure, or abnormal heart rhythms. Because fingolimod can affect heart rate and rhythm, your prescriber will want to know how long you've been taking it, whether your heart rate is stable, and whether you've had any recent cardiovascular monitoring by your neurologist.

Your prescriber will also check your blood pressure. If you have very low blood pressure (hypotension), tadalafil may not be suitable, as it can lower blood pressure further [3][4]. Conversely, if you have high blood pressure, your prescriber will want to ensure it is well controlled. They will ask about all other medicines you take, including over-the-counter products and supplements, because some can interact with tadalafil. For example, potent CYP3A4 inhibitors (such as ritonavir, ketoconazole, or clarithromycin) can raise tadalafil levels and require dose adjustments, while CYP3A4 inducers (like rifampicin or St John's wort) can reduce its effectiveness.

You must declare every medicine you're taking, including fingolimod, during your consultation. Never stop or change a prescribed medicine like fingolimod without speaking to the doctor who prescribed it. If your prescriber has any concerns about the combination, they may contact your neurologist or GP for further information, or they may recommend starting on a lower dose of tadalafil to minimise any risk.

Medicines that must never be taken with tadalafil

Do not take tadalafil if you use nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or amyl/alkyl nitrites (poppers) [3][4]. Combining tadalafil with any of these medicines can cause a dangerous drop in blood pressure. You must also not take tadalafil alongside another PDE5 inhibitor (such as sildenafil, vardenafil, or avanafil). If you're unsure whether any of your medicines fall into these categories, ask your prescriber or pharmacist during your consultation.

How to take tadalafil safely if you're on fingolimod

If your prescriber approves tadalafil, follow the dosing instructions carefully. For on-demand use, take one 10 mg or 20 mg tablet at least 30 minutes before you plan to have sex [4]. The effect can last up to 36 hours, so you do not need to time it as precisely as with some other ED treatments. Do not take more than one dose in 24 hours. If you're prescribed daily tadalafil (2.5 mg or 5 mg), take one tablet at the same time each day, regardless of when you plan to have sex.

Tadalafil needs sexual stimulation to work; it will not cause an erection on its own [1][4]. Avoid drinking large amounts of alcohol, as this can make erectile dysfunction worse and increase the risk of dizziness or low blood pressure. Grapefruit juice can raise tadalafil levels in your blood, so it's best to avoid it while using this medicine. If you experience dizziness or light-headedness, especially when standing up, sit or lie down until it passes, and mention it to your prescriber.

Continue taking fingolimod exactly as prescribed by your neurologist. Do not stop or adjust your fingolimod dose because you're starting tadalafil. If you notice any new symptoms or side effects after starting tadalafil, such as unusual changes in heart rate, chest discomfort, or severe dizziness, contact your GP or specialist promptly. Most men tolerate tadalafil well, but it's important to stay alert to how your body responds, particularly in the first few days of treatment.

What if tadalafil isn't suitable for you?

If your prescriber feels tadalafil is not appropriate due to your cardiovascular history or other factors, there are alternative ED treatments available [2]. Other PDE5 inhibitors, such as sildenafil (Viagra), vardenafil (Levitra), or avanafil (Spedra), work in a similar way but have different durations of action and may suit some men better. Your prescriber can discuss which option is safest and most convenient for you. Non-tablet treatments, such as Vitaros (alprostadil cream) or vacuum erection devices, may also be considered if oral medicines are not suitable [7].

Side effects and warning signs with tadalafil and fingolimod

Common side effects of tadalafil include headache, indigestion, back pain, muscle aches, flushing, and nasal congestion [3][4]. These are usually mild and short-lived. Fingolimod can cause headaches, diarrhoea, cough, and back pain, among other effects [12]. Because both medicines can occasionally cause headaches or back pain, you may notice these symptoms more if you're taking both, though they are not usually serious.

More serious side effects are rare but require urgent attention. If you develop an erection that lasts longer than four hours (priapism), seek emergency help immediately, as this can cause permanent damage if not treated [3][4]. 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 also medical emergencies; stop taking tadalafil and go to A&E or call 999. If you experience chest pain during or after sex, do not use nitrates to relieve it; tell the healthcare professional that you have taken tadalafil and seek urgent medical help.

Fingolimod can cause serious cardiovascular and immune-related side effects, including slow heart rate, infections, and liver problems [12]. Your neurologist will monitor you regularly for these. If you develop new or worsening symptoms such as severe dizziness, fainting, chest pain, shortness of breath, or signs of infection (fever, persistent sore throat) while taking both medicines, contact your GP or specialist the same day. Always report any unexpected symptoms to a healthcare professional rather than assuming they are harmless.

Getting tadalafil and fingolimod: your next steps

Fingolimod is prescribed and monitored by a specialist, usually a neurologist, and you will continue to receive it through your usual hospital or specialist pharmacy. If you're experiencing erectile dysfunction and would like to explore treatment, you can request a consultation with Cured Pharmacy, a GPhC-registered online pharmacy (GPhC 9012511). Our service allows you to complete a confidential online health questionnaire, which is reviewed by a UK-registered prescriber. You must declare all your current medicines, including fingolimod, so the prescriber can assess whether tadalafil or another ED treatment is safe for you.

If approved, your prescription will be dispensed by our pharmacy and delivered discreetly to your home. Tadalafil (generic Cialis) is available from £7.95 for on-demand tablets, or £6.36 for your first order with code Ednew. We also offer other ED treatments, including sildenafil (from £0.45, or £0.36 with code Ednew), vardenafil (£16.95, or £13.56 with code Ednew), and avanafil (Spedra, £20.95, or £16.76 with code Ednew). Your prescriber will recommend the most suitable option based on your health and preferences.

Remember, erectile dysfunction can sometimes be an early warning sign of cardiovascular disease or diabetes [1][2]. If you're experiencing ED for the first time, it's a good idea to see your GP for a general health check, even if you're already under specialist care for multiple sclerosis. Your GP can assess your overall cardiovascular risk, check your blood pressure and cholesterol, and ensure any underlying conditions are well managed. Treating ED is important, but so is looking after your long-term health.

Why choose Cured Pharmacy for ED treatment?

Cured Pharmacy is a fully registered UK online pharmacy, regulated by the General Pharmaceutical Council. Every prescription is reviewed by a qualified UK prescriber, and our pharmacists are available to answer your questions. We offer a discreet, convenient service with fast delivery, and our prices are transparent with no hidden fees. Whether you're new to ED treatment or looking for a more convenient way to access your medication, we're here to help you find a safe, effective solution.

When to get urgent help

• Erection lasting more than 4 hours (priapism) – go to A&E immediately
• Sudden loss of vision in one or both eyes – stop tadalafil and call 999
• Sudden loss or decrease in hearing, with or without ringing or dizziness – seek emergency help
• Chest pain during or after sex – do not use nitrates; tell the healthcare professional you've taken tadalafil
• Severe dizziness, fainting, or irregular heartbeat – contact your GP or call 111 the same day

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

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