Tadalafil and Etanercept: Can They Be Taken Together?

Takes less than 2 minutes to complete 100% online

Key takeaways

• No major direct interaction is commonly reported between tadalafil and etanercept
• Your prescriber reviews all medicines during consultation to ensure tadalafil is safe
• Never take tadalafil with nitrates, nicorandil, riociguat or poppers
• Continue etanercept as prescribed—no dose adjustment needed when taking tadalafil
• Seek urgent help for erection lasting over four hours or sudden vision or hearing loss

What Is Tadalafil and How Does It Work?

Tadalafil is a prescription medicine used to treat erectile dysfunction (ED) in men [4]. It belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors, which work by relaxing the blood vessels in the penis, allowing increased blood flow when you are sexually aroused. Tadalafil is the active ingredient in branded Cialis and is also available as a generic medicine at lower cost.

Tadalafil is available in two forms: on-demand tablets (10mg or 20mg) taken at least 30 minutes before sexual activity, with effects lasting up to 36 hours, and daily tablets (2.5mg or 5mg) taken once a day [4]. All PDE5 inhibitors require sexual stimulation to work—they do not cause an automatic erection. At Cured Pharmacy, tadalafil is available on prescription after a consultation reviewed by a UK prescriber.

What Is Etanercept and Why Is It Prescribed?

Etanercept (brand name Enbrel) is a biologic medicine used to treat autoimmune conditions such as rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, and severe psoriasis. It works by blocking the action of a protein called tumour necrosis factor-alpha (TNF-alpha), which plays a key role in inflammation and joint damage. Etanercept is given as an injection under the skin, usually once or twice a week.

Because etanercept suppresses part of the immune system to reduce inflammation, people taking it may be at slightly higher risk of infections. Your rheumatologist or specialist will monitor you regularly. Etanercept does not directly affect blood pressure or the enzymes that break down tadalafil, which is why no major interaction between tadalafil and etanercept is commonly reported in clinical practice.

Does Etanercept Cause Erectile Dysfunction?

Etanercept itself is not known to cause erectile dysfunction. However, the conditions it treats—particularly rheumatoid arthritis and psoriatic arthritis—can be associated with ED. Chronic inflammation, pain, fatigue, and reduced mobility can all affect sexual function and confidence [1]. Some men also experience ED as a side effect of other medicines used alongside etanercept, such as corticosteroids or methotrexate, or due to cardiovascular risk factors that are more common in people with inflammatory arthritis [10].

At a glance

Do Tadalafil and Etanercept Interact?

No major direct interaction is commonly reported between tadalafil and etanercept. Etanercept is a large protein molecule (a biologic) that works on the immune system, while tadalafil is a small molecule that acts on blood vessels in the penis. They are broken down by different pathways in the body: etanercept is metabolised like other proteins, and tadalafil is primarily metabolised by liver enzymes (CYP3A4) [4]. Because they do not share the same metabolic pathway or mechanism of action, they are not expected to interfere with each other.

However, it is essential that your prescriber reviews all your current medicines, including etanercept, during your consultation. This ensures that any other medicines you take—such as blood pressure tablets, methotrexate, or corticosteroids—are also considered. Your overall health, including cardiovascular fitness and any history of heart disease, will be assessed to confirm that tadalafil is safe for you [2].

What Does Your Prescriber Check Before Prescribing Tadalafil?

Before prescribing tadalafil, your prescriber will ask about your full medical history and all current medicines, including etanercept and any other treatments for arthritis or inflammation. They will check for conditions that make PDE5 inhibitors unsuitable, such as recent heart attack or stroke, unstable angina, severe heart failure, very low blood pressure, or previous sudden vision loss (NAION) [2][4].

Your prescriber will also review medicines that can interact with tadalafil. You must never take tadalafil with nitrates (GTN spray, isosorbide mononitrate or dinitrate), nicorandil, riociguat, or amyl/alkyl nitrites ('poppers'), as the combination can cause a dangerous fall in blood pressure [4]. If you take alpha-blockers (such as doxazosin or tamsulosin for prostate symptoms), you should be stable on the alpha-blocker and start on the lowest dose of tadalafil. Potent CYP3A4 inhibitors (such as ritonavir, ketoconazole, or clarithromycin) can raise tadalafil levels, so your dose may need to be adjusted [4].

Declaring All Your Medicines

It is vital to declare every medicine you take during your consultation, including prescription medicines, over-the-counter products, herbal remedies, and supplements. This includes methotrexate, corticosteroids, non-steroidal anti-inflammatory drugs (NSAIDs), and any blood pressure or heart medicines. Even if a medicine is not known to interact with tadalafil, your prescriber needs the full picture to make a safe decision. Never stop or change a prescribed medicine without advice from your doctor or pharmacist.

Practical Advice for Taking Tadalafil with Etanercept

If your prescriber confirms that tadalafil is suitable for you, take it exactly as directed. On-demand tadalafil (10mg or 20mg) should be taken at least 30 minutes before sexual activity, and the effect can last up to 36 hours [4]. Daily tadalafil (2.5mg or 5mg) is taken once a day at the same time, regardless of when you plan to have sex. Do not take more than one dose in 24 hours, and remember that sexual stimulation is needed for the medicine to work.

Continue taking etanercept as prescribed by your rheumatologist. There is no need to adjust the timing of your etanercept injections around tadalafil. However, if you feel unwell, dizzy, or experience any unusual symptoms after taking tadalafil, stop and seek advice from your GP or pharmacist. Avoid heavy alcohol, as it can worsen ED and add to the blood-pressure-lowering effect of tadalafil [1]. Grapefruit juice can raise tadalafil levels and should be avoided.

When to Seek Help and Warning Signs with Tadalafil and Etanercept

Tadalafil is generally well tolerated, but you should be aware of warning signs that need urgent attention. If you develop an erection lasting more than four hours (priapism), seek emergency help immediately, as this can cause permanent damage [4]. Sudden loss of vision or hearing, or chest pain during sex, also requires urgent medical attention. These side effects are rare but serious.

If you develop signs of infection while taking etanercept—such as fever, persistent sore throat, or unusual bruising—contact your rheumatologist or GP promptly, as etanercept can increase infection risk. If you experience dizziness, fainting, or a significant drop in blood pressure after taking tadalafil, stop the medicine and seek advice. Your prescriber at Cured Pharmacy is available to answer questions during and after your consultation, and you should always feel comfortable asking for help.

Other PDE5 Inhibitors and Etanercept

If tadalafil is not suitable for you, other PDE5 inhibitors may be considered, such as sildenafil (Viagra), vardenafil (Levitra), or avanafil (Spedra) [3][5][6]. Like tadalafil, these medicines are not known to interact directly with etanercept. However, the same precautions apply: your prescriber will review your full medical history and all current medicines. Never take two PDE5 inhibitors together, and never combine a PDE5 inhibitor with nitrates, nicorandil, riociguat, or poppers [2].

When to get urgent help

• Erection lasting more 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 or fainting after taking tadalafil—contact your GP or call 111
• Signs of serious infection (fever, persistent sore throat) while on etanercept—contact your rheumatologist or GP promptly

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