Can You Take Tadalafil and Paracetamol Together?

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At a glance

What is tadalafil and paracetamol used for?

Tadalafil is a prescription medicine used to treat erectile dysfunction (ED) in men [4]. 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. Tadalafil is available as an on-demand treatment (10 mg or 20 mg tablets 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) [4]. It requires sexual stimulation to work and does not cause an automatic erection.

Paracetamol is a widely used over-the-counter painkiller and fever reducer. It is commonly taken for headaches, muscle aches, period pain, toothache, and cold or flu symptoms. Paracetamol works by reducing the production of chemicals in the brain that cause pain and fever. The usual adult dose is 500 mg to 1000 mg (one or two tablets) every four to six hours, with a maximum of 4000 mg (eight 500 mg tablets) in 24 hours. Unlike some other painkillers, paracetamol does not affect blood pressure or blood flow in a significant way.

Do tadalafil and paracetamol interact with each other?

There is no known interaction between tadalafil and paracetamol. The two medicines work through completely different mechanisms in the body and do not interfere with each other's effectiveness or safety. Paracetamol does not affect the enzymes that break down tadalafil, nor does it influence blood pressure or blood vessel function in a way that would cause concern when combined with a PDE5 inhibitor.

This means you can take paracetamol for a headache, muscle pain, or any other common ailment on the same day that you take tadalafil for erectile dysfunction. You do not need to leave a gap between the two medicines, and you do not need to adjust the dose of either. However, it is always important to follow the recommended dosing instructions for each medicine and to inform your prescriber or pharmacist about all medicines you are taking, including over-the-counter painkillers.

How the two medicines work differently

Tadalafil works by blocking an enzyme called phosphodiesterase type 5 (PDE5), which normally breaks down a chemical that relaxes smooth muscle in blood vessels [4]. By blocking PDE5, tadalafil allows blood vessels in the penis to stay relaxed and open, improving blood flow during sexual arousal. Paracetamol, on the other hand, is thought to work mainly in the central nervous system by reducing the production of prostaglandins, chemicals involved in pain and fever. Because these mechanisms are entirely separate, the medicines do not interfere with one another.

What does your prescriber check before prescribing tadalafil?

Before prescribing tadalafil, a UK prescriber will review your full medical history and current medicines to ensure it is safe for you [2]. They will ask about heart conditions, blood pressure, recent stroke or heart attack, liver or kidney problems, and any history of priapism (prolonged erection) or eye conditions such as non-arteritic anterior ischaemic optic neuropathy (NAION). Sexual activity itself places demands on the heart, so tadalafil is not suitable if your doctor has advised you to avoid sexual activity.

The prescriber will also check for medicines that must never be taken with tadalafil. These include nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, and recreational drugs known as 'poppers' (amyl or alkyl nitrites) [4]. Combining tadalafil with any of these can cause a dangerous drop in blood pressure. You must also not take tadalafil alongside another PDE5 inhibitor such as sildenafil or vardenafil. If you are taking alpha-blockers (for prostate symptoms or high blood pressure), the prescriber will ensure you are stable on that medicine and may start you on a lower dose of tadalafil.

Because paracetamol does not fall into any of these categories and does not affect blood pressure or interact with tadalafil, it will not prevent you from being prescribed tadalafil. However, you should still mention all medicines you take, including over-the-counter painkillers, during your consultation.

What you need to know

• Tadalafil and paracetamol do not interact and can be taken together safely.
• Paracetamol is suitable for relieving headaches caused by tadalafil.
• Always declare all medicines during your consultation, including over-the-counter painkillers.
• Seek urgent help for erections lasting over four hours or sudden vision or hearing loss.

Can you take other painkillers with tadalafil?

Paracetamol is generally the safest painkiller to take alongside tadalafil because it does not interact with the medicine. Other common painkillers, such as ibuprofen, aspirin, and naproxen (non-steroidal anti-inflammatory drugs or NSAIDs), are also not known to interact directly with tadalafil. However, NSAIDs can occasionally affect kidney function or cause stomach irritation, so if you have kidney problems or take them regularly, your prescriber will want to know.

Codeine-based painkillers (such as co-codamol, which contains paracetamol and codeine) are also generally safe to use with tadalafil, as codeine does not interact with PDE5 inhibitors. If you are prescribed stronger painkillers or take any regular medication for chronic pain, always declare this during your consultation. Your prescriber or pharmacist will check every medicine you are taking to ensure there are no concerns.

Headache as a side effect of tadalafil

Headache is one of the most common side effects of tadalafil, reported by some men who take the medicine [4]. This happens because PDE5 inhibitors can widen blood vessels throughout the body, not just in the penis. If you develop a headache after taking tadalafil, paracetamol is a suitable and effective option to relieve it. The headache is usually mild and temporary, and often becomes less noticeable with continued use of tadalafil. If headaches are severe or persistent, speak to your prescriber, as a lower dose may be more suitable.

Practical advice for taking tadalafil and paracetamol safely

If you are taking tadalafil on demand (10 mg or 20 mg), take it at least 30 minutes before you plan to have sex. You can take paracetamol at any time if you need pain relief, whether before, during, or after taking tadalafil. There is no need to time the two medicines separately. If you are taking daily tadalafil (2.5 mg or 5 mg), you can continue to use paracetamol as needed for headaches, muscle pain, or other common ailments without any concern.

Always follow the dosing instructions on the paracetamol packet: do not exceed 4000 mg (eight 500 mg tablets) in 24 hours, and leave at least four hours between doses. For tadalafil, do not take more than one on-demand dose in 24 hours, and do not take an on-demand dose if you are already taking daily tadalafil. If you are unsure about how to take either medicine, or if you have any questions about your treatment, contact your prescriber or pharmacist for advice.

Remember that tadalafil requires sexual stimulation to work and does not cause an automatic erection. Avoid drinking large amounts of alcohol when taking tadalafil, as this can make erectile dysfunction worse and increase the risk of dizziness or low blood pressure. Grapefruit juice can raise tadalafil levels in the blood and should be avoided.

When to get urgent help

• Erection lasting longer than 4 hours (priapism) – go to A&E immediately
• Sudden loss of vision or hearing – seek urgent medical attention
• Chest pain during or after sex – call 999
• Severe dizziness, fainting, or signs of very low blood pressure – seek same-day medical advice

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

When to seek medical advice about tadalafil and paracetamol

Although tadalafil and paracetamol do not interact, you should seek urgent medical help if you experience certain warning signs while taking tadalafil. If you develop an erection that lasts longer than four hours (priapism), this is a medical emergency and you should go to A&E immediately, as it can cause permanent damage to the penis [4]. Sudden loss of vision or hearing, chest pain during sex, or severe dizziness or fainting also require urgent attention.

If you are taking paracetamol regularly for chronic pain or headaches, or if you find you need to take it frequently after using tadalafil, speak to your GP or prescriber. Frequent headaches may indicate that a lower dose of tadalafil would be more suitable, or that an underlying health issue needs investigation. Never exceed the recommended dose of paracetamol, as taking too much can cause serious liver damage.

If you have any new symptoms, side effects, or concerns about your treatment, contact your prescriber or pharmacist. At Cured Pharmacy, all prescription treatments are supplied only after an online consultation reviewed by a UK-registered prescriber, and our pharmacist-led team is available to answer your questions.

Why it's important to declare all your medicines

Even though paracetamol does not interact with tadalafil, it is essential to tell your prescriber about every medicine you take, including over-the-counter painkillers, vitamins, herbal remedies, and recreational drugs. Some medicines and supplements can interact with tadalafil in ways that are not immediately obvious. For example, St John's wort (a herbal remedy for low mood) can reduce the effectiveness of tadalafil, while some antibiotics and antifungal medicines can increase tadalafil levels in the blood. Your prescriber will check for these interactions to keep you safe.