Can You Take Tadalafil and Amitriptyline Together?

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Key takeaways

• Tadalafil and amitriptyline have no major direct interaction and can usually be taken together safely.
• Both medicines can lower blood pressure, so your prescriber will check your cardiovascular health first.
• Stand up slowly and limit alcohol to reduce the risk of dizziness.
• Always declare all your medicines during the consultation, including amitriptyline.
• Seek urgent help for chest pain, prolonged erection over 4 hours, or sudden vision or hearing loss.

What is tadalafil and amitriptyline used for?

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed in the UK to treat erectile dysfunction (ED) and, in some cases, benign prostatic hyperplasia (enlarged prostate). It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused. Tadalafil is available on-demand (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 (2.5 mg or 5 mg) for continuous readiness [4].

Amitriptyline is a tricyclic antidepressant (TCA) prescribed for several conditions, including depression, chronic nerve pain (neuropathy), migraine prevention, and tension headaches. It works by increasing levels of certain neurotransmitters in the brain, such as serotonin and noradrenaline. Amitriptyline also has anticholinergic effects (blocking certain nerve signals) and can affect heart rhythm and blood pressure, particularly at higher doses.

Both medicines are prescription-only in the UK. If you are taking amitriptyline and considering tadalafil for ED, a UK-registered prescriber will assess whether the combination is suitable for you during an online or face-to-face consultation.

Is there an interaction between tadalafil and amitriptyline?

There is no major direct pharmacological interaction between tadalafil and amitriptyline that would make the combination unsafe for most people. Neither medicine significantly affects the metabolism of the other, and they do not share a common pathway that would lead to dangerous drug accumulation.

However, both medicines can lower blood pressure. Tadalafil relaxes blood vessels throughout the body, which can cause a modest drop in blood pressure—usually mild and well-tolerated, but occasionally noticeable as dizziness or light-headedness, especially when standing up quickly. Amitriptyline can also cause postural hypotension (a drop in blood pressure when you stand) and may affect heart rhythm, particularly in people with existing heart conditions or those taking higher doses.

Because of these overlapping effects, your prescriber will check your current dose of amitriptyline, your blood pressure, and your cardiovascular health before approving tadalafil. Most men taking a stable dose of amitriptyline can use tadalafil safely, but it is essential to disclose all your medicines and health conditions during the consultation [4][12].

How the interaction works in plain English

Think of your blood pressure as being controlled by the tension in your blood vessel walls. Tadalafil gently relaxes these walls to help blood flow to the penis. Amitriptyline can also relax blood vessels and affect the signals that keep your blood pressure steady when you change position. When both medicines are working at once, the combined relaxing effect can occasionally make you feel dizzy or faint, especially if you stand up too quickly. This is usually manageable and does not mean the combination is dangerous, but your prescriber needs to know you are taking amitriptyline so they can choose the right starting dose of tadalafil and advise you on what to watch for.

At a glance

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

During your consultation, the prescriber will ask detailed questions to ensure tadalafil is safe for you. They will want to know the dose of amitriptyline you are taking, how long you have been on it, and whether you have experienced any side effects such as dizziness, fainting, or heart palpitations. They will also ask about your blood pressure, any history of heart disease (including angina, heart attack, or stroke), and whether you take any other medicines that affect blood pressure or heart rhythm.

The prescriber will check 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). If you are on any of these, you must not take tadalafil, as the combination can cause a dangerous drop in blood pressure [4].

If you are taking other blood-pressure-lowering medicines (such as amlodipine, ramipril, or bisoprolol) in addition to amitriptyline, the prescriber will assess the overall risk. They may start you on a lower dose of tadalafil (for example, 10 mg instead of 20 mg) and advise you to monitor for dizziness. If you are on an alpha-blocker for prostate symptoms (such as tamsulosin or doxazosin), special caution is needed, and you should be stable on that medicine before starting tadalafil at the lowest dose [2][4].

Practical advice for taking tadalafil and amitriptyline safely

If your prescriber approves tadalafil while you are on amitriptyline, follow these practical steps to minimise any risk. Take tadalafil exactly as prescribed—do not exceed the recommended dose or take it more often than once a day (for on-demand use). If you are using daily tadalafil, take it at the same time each day. Sexual activity itself can put extra demand on your heart, so if you experience chest pain, severe dizziness, or shortness of breath during sex, stop and seek medical help immediately.

Be aware of postural hypotension: when you stand up from sitting or lying down, do so slowly to give your body time to adjust. Avoid heavy alcohol, as it can worsen dizziness, lower blood pressure further, and make it harder to achieve an erection. Grapefruit juice can increase tadalafil levels in your blood, so it is best avoided or limited.

Do not stop or change your amitriptyline dose without consulting the doctor who prescribed it. If you notice new or worsening side effects after starting tadalafil—such as persistent dizziness, fainting, irregular heartbeat, or prolonged erection lasting more than four hours—contact your GP or call NHS 111 for advice. Always keep an up-to-date list of all your medicines (including over-the-counter products and supplements) and share it with every healthcare professional you see [1][4].

Starting tadalafil while on amitriptyline

Your prescriber may suggest starting with a lower dose of tadalafil (such as 10 mg on-demand rather than 20 mg) to see how you tolerate the combination. This cautious approach allows you to assess any dizziness or blood-pressure effects before increasing the dose if needed. If you experience no problems, the dose can be adjusted at a follow-up consultation. Never take more than the prescribed dose, and never combine tadalafil with another PDE5 inhibitor (such as sildenafil or vardenafil) on the same day.

Warning signs and when to seek help with tadalafil and amitriptyline

Most men taking tadalafil and amitriptyline together experience no serious problems, but it is important to recognise warning signs that need urgent attention. If you develop chest pain or discomfort during or after sexual activity, stop immediately and call 999—do not take any nitrate medicine (such as GTN spray) if you have used tadalafil within the last 48 hours, as this combination can be life-threatening.

Seek urgent help if you experience a sudden loss of vision in one or both eyes (which may indicate a rare condition called non-arteritic anterior ischaemic optic neuropathy, or NAION) or sudden hearing loss or ringing in the ears. An erection lasting more than four hours (priapism) is a medical emergency and requires immediate treatment to prevent permanent damage to the penis.

Contact your GP or NHS 111 if you have severe or persistent dizziness, fainting, a very fast or irregular heartbeat, or swelling of the face, lips, or throat (signs of an allergic reaction). If you feel unwell in any way that concerns you after taking tadalafil, do not hesitate to seek advice. It is always better to check with a healthcare professional than to ignore symptoms [1][4][12].

Getting tadalafil safely while taking amitriptyline at Cured Pharmacy

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering a convenient, confidential way to access erectile dysfunction treatment. All ED medicines, including tadalafil, are prescription-only and can only be supplied after a clinical consultation reviewed by a UK-registered prescriber. During the online assessment, you will be asked about all your current medicines (including amitriptyline), your medical history, and any symptoms or side effects you have experienced.

The prescriber will determine whether tadalafil is suitable for you and, if so, which dose is safest to start with. You can choose from a range of tadalafil products, including generic tadalafil from £7.95 (£6.36 with first-order code Ednew), branded Cialis from £12.00 (£9.60 with code Ednew), and Teva tadalafil 20 mg from £9.99 (£7.99 with code Ednew). If tadalafil is not appropriate, the prescriber may suggest an alternative PDE5 inhibitor such as sildenafil, vardenafil, or avanafil.

Your medicine will be dispensed by a qualified pharmacist and delivered discreetly to your door. If you have any questions about taking tadalafil with amitriptyline, the pharmacy team is available to help. Remember, if you have not seen your GP about erectile dysfunction before, it is a good idea to do so, as ED can sometimes be an early sign of underlying health conditions such as diabetes or heart disease [1][2].

Why declare all your medicines during the consultation

It is essential to list every medicine you take—prescription, over-the-counter, herbal, and recreational—during your ED consultation. Even if you think a medicine is unrelated to erectile dysfunction, it may interact with tadalafil or provide important clues about your overall health. For example, amitriptyline itself can sometimes contribute to erectile difficulties, and your prescriber may want to discuss this with your GP. Full disclosure ensures you receive the safest, most effective treatment and helps avoid potentially dangerous drug interactions.

When to get urgent help

• Chest pain or discomfort during or after sex—call 999 and do not take nitrates
• Erection lasting more than 4 hours (priapism)—go to A&E immediately
• Sudden loss of vision in one or both eyes—seek urgent medical help
• Sudden hearing loss or severe ringing in the ears—contact your GP or NHS 111
• Severe dizziness, fainting, or very fast/irregular heartbeat—call 999 or go to A&E

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

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