Tadalafil and Vortioxetine: Can You Take Them Together?

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At a glance

What is tadalafil and vortioxetine used for?

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed to treat erectile dysfunction in men [4]. It works by relaxing blood vessels in the penis, allowing increased blood flow when you're sexually aroused. Tadalafil is available as on-demand tablets (10mg or 20mg taken at least 30 minutes before sex, with effects lasting up to 36 hours) or as a daily low-dose option (2.5mg or 5mg) [4]. It requires sexual stimulation to work and does not increase libido on its own.

Vortioxetine is an antidepressant used to treat major depressive disorder in adults [12]. It works by modulating several neurotransmitters in the brain, including serotonin, noradrenaline, and dopamine. Vortioxetine is typically taken once daily and may take several weeks to show its full effect on mood. Like many antidepressants, vortioxetine can sometimes contribute to sexual side effects, including erectile difficulties, which is why some men taking it may also seek treatment for ED [2].

Is there an interaction between tadalafil and vortioxetine?

No major direct pharmacological interaction between tadalafil and vortioxetine is commonly reported in the medical literature [12]. Vortioxetine is not a potent inhibitor or inducer of the liver enzyme CYP3A4, which is the main pathway for breaking down tadalafil in the body [4][12]. This means vortioxetine is unlikely to significantly raise or lower tadalafil levels in your bloodstream.

However, both medicines can have effects on blood pressure. Tadalafil can cause a mild drop in blood pressure, particularly when you first start taking it or when combined with other blood-pressure-lowering medicines [4]. Vortioxetine is not primarily known for lowering blood pressure, but any medicine affecting the central nervous system should be considered as part of your overall medication review. Your prescriber will check your full list of current medicines, including vortioxetine, to ensure tadalafil is safe for you [2].

It's also worth noting that depression and antidepressant treatment can both contribute to erectile dysfunction [2]. If you're experiencing ED while taking vortioxetine, it may be related to your depression itself, a side effect of the medication, or an unrelated cause such as cardiovascular health. Your prescriber will explore these factors during your consultation to ensure the most appropriate treatment plan.

How tadalafil works in the body

Tadalafil blocks the enzyme phosphodiesterase type 5 (PDE5), which normally breaks down a substance called cyclic GMP in the penis [4]. By inhibiting PDE5, tadalafil allows cyclic GMP to build up, leading to smooth muscle relaxation and increased blood flow during sexual arousal. The medicine is absorbed after oral administration and is broken down mainly by the liver enzyme CYP3A4, with a half-life of around 17.5 hours, which explains its long duration of action [4].

What your prescriber will check before prescribing tadalafil and vortioxetine together

During your online consultation at Cured Pharmacy, the UK-registered prescriber will review your complete medical history and all current medications, including vortioxetine [2]. They will check that you do not have any contraindications to tadalafil, such as recent heart attack or stroke, unstable angina, severe heart failure, very low blood pressure, or a history of non-arteritic anterior ischaemic optic neuropathy (sudden vision loss) [4].

The prescriber will also ensure you are not taking any medicines that must never be combined with tadalafil. These include nitrates (such as GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, amyl or alkyl nitrites (poppers), or another PDE5 inhibitor [4]. Taking tadalafil with any of these can cause a dangerous drop in blood pressure.

If you take alpha-blockers (such as doxazosin or tamsulosin for prostate symptoms), the prescriber will check that you are stable on that treatment and may start you on the lowest dose of tadalafil to minimise the risk of dizziness or low blood pressure [4]. Any other blood-pressure medicines will also be reviewed, as tadalafil can add to their blood-pressure-lowering effect. The prescriber will confirm that sexual activity is safe for you based on your cardiovascular health [2].

What you need to know

• No major direct interaction between tadalafil and vortioxetine is commonly reported in medical literature.
• Your prescriber will review all current medicines including vortioxetine before approving tadalafil treatment.
• Do not stop vortioxetine without medical advice; tadalafil can usually be started while continuing your antidepressant.
• Avoid heavy alcohol and tell your prescriber about all medicines, supplements, and herbal products you take.
• Seek urgent help for erections lasting over four hours or sudden vision or hearing loss.

Practical advice for taking tadalafil with vortioxetine

If your prescriber approves tadalafil while you are taking vortioxetine, continue taking both medicines exactly as prescribed. Do not stop or change the dose of vortioxetine without consulting the doctor who prescribed it, as stopping antidepressants suddenly can cause withdrawal symptoms [12]. Take tadalafil as directed: on-demand tablets (10mg or 20mg) should be taken at least 30 minutes before sexual activity, while daily tablets (2.5mg or 5mg) are taken once a day at the same time [4].

Be aware of how you feel when you first start tadalafil, particularly any dizziness or light-headedness when standing up. This can be a sign of low blood pressure and is more likely if you also take other medicines that lower blood pressure. Avoid heavy alcohol while using tadalafil, as it can worsen erectile dysfunction and increase the risk of side effects such as dizziness, headache, and low blood pressure [4].

If you experience any new or worsening symptoms after starting tadalafil, contact your prescriber or GP. Common side effects of tadalafil include headache, indigestion, back pain, muscle aches, flushing, and nasal congestion [4]. These are usually mild and temporary. Remember that tadalafil requires sexual stimulation to work and does not increase sexual desire on its own.

When to seek urgent help

Seek immediate medical attention if you develop an erection lasting more than four hours (priapism), as this can cause permanent damage if not treated promptly [4]. Stop taking tadalafil and seek urgent help if you experience sudden loss of vision in one or both eyes, sudden decrease or loss of hearing (which may be accompanied by ringing in the ears or dizziness), or chest pain during sexual activity [4]. If you have chest pain, do not take nitrates to relieve it while tadalafil is in your system; tell the healthcare professional that you have taken tadalafil.

Other medicines that can interact with tadalafil and vortioxetine

While vortioxetine itself does not have a major interaction with tadalafil, it's important to be aware of other medicines that can affect tadalafil levels or safety. Potent CYP3A4 inhibitors such as ritonavir, cobicistat (found in some HIV treatments), ketoconazole, itraconazole, and clarithromycin can significantly raise tadalafil levels in the blood [4]. If you take any of these, your prescriber may need to reduce your tadalafil dose or avoid it altogether, depending on the specific medicine and dose.

Conversely, CYP3A4 inducers such as rifampicin, carbamazepine, phenytoin, and St John's wort can lower tadalafil levels and make it less effective [4]. Grapefruit juice can also raise tadalafil levels and should be avoided or limited. If you are taking vortioxetine alongside other antidepressants or medicines that affect serotonin, your doctor will monitor you for serotonin syndrome, although this is not directly related to tadalafil [12].

Always tell your prescriber about every medicine you take, including over-the-counter products, herbal remedies, and supplements. Do not start, stop, or change any prescribed medicine without professional advice. Your online consultation at Cured Pharmacy includes a thorough medication review to identify any potential interactions and ensure your treatment is safe [2].

When to get urgent help

• Erection lasting more than four hours (priapism) – go to A&E immediately to prevent permanent damage
• Sudden loss of vision in one or both eyes – stop tadalafil and seek urgent medical attention
• Sudden decrease or loss of hearing, possibly with ringing in the ears or dizziness – stop tadalafil and see a doctor urgently
• Chest pain during or after sexual activity – do not take nitrates; tell the healthcare professional you have taken tadalafil
• Severe dizziness or fainting after taking tadalafil – seek same-day medical advice from your GP or call 111

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

How to access tadalafil safely through Cured Pharmacy

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering convenient access to erectile dysfunction treatments after a clinical assessment by a UK-registered prescriber. To request tadalafil, you will complete an online consultation form detailing your medical history, current medications (including vortioxetine), and any other relevant health information [2]. A UK prescriber will review your answers to ensure tadalafil is safe and appropriate for you.

If approved, your prescription will be dispensed by our pharmacy team and delivered discreetly to your address. Tadalafil is available in several forms, including generic tadalafil tablets and branded Cialis, with on-demand and daily dosing options to suit your needs [4]. You can also access other PDE5 inhibitors such as sildenafil, vardenafil, and avanafil if they are more suitable for your situation.

If you have new or worsening erectile dysfunction, we encourage you to see your GP for a full assessment, as ED can be an early warning sign of cardiovascular disease or diabetes [1][2]. Treating the underlying cause is an important part of managing erectile dysfunction. Our service is designed to provide convenient, confidential access to treatment for men who have already discussed their ED with a healthcare professional or who have straightforward cases suitable for online assessment.

Why choose Cured Pharmacy for ED treatment

Cured Pharmacy combines clinical expertise with convenience and discretion. Every prescription is reviewed by a UK-registered prescriber, and our pharmacy team is available to answer any questions about your treatment. We offer a range of ED medicines at transparent prices, with fast, discreet delivery across the UK. Your privacy and safety are our top priorities, and all consultations and prescriptions are handled in line with GPhC and MHRA standards.