Can You Take Sildenafil and Paroxetine Together?

Takes less than 2 minutes to complete 100% online

Key takeaways

• No major dangerous interaction is commonly reported between sildenafil and paroxetine
• Always declare all medicines, including antidepressants, during your ED consultation
• Never stop paroxetine without medical advice, even if experiencing side effects
• Avoid heavy alcohol and grapefruit juice when taking sildenafil
• Seek urgent help for erections lasting over four hours or sudden vision loss

What Is Sildenafil and How Does It Work?

Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED). It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused [3]. Sildenafil is the active ingredient in Viagra and is available in 25mg, 50mg, and 100mg tablets.

You typically take sildenafil about one hour before sexual activity, and it can remain effective for up to four hours. It only works when you are sexually stimulated—it does not cause an automatic erection [1]. Sildenafil is a prescription medicine in the UK, and treatment requires an online or face-to-face consultation with a qualified prescriber who will check your medical history and current medicines.

Common side effects include headache, flushing, indigestion, and nasal congestion. More serious but rare side effects include sudden vision or hearing loss, chest pain during sex, or an erection lasting more than four hours (priapism), all of which require urgent medical attention [3].

What Is Paroxetine and Why Is It Prescribed?

Paroxetine is a selective serotonin reuptake inhibitor (SSRI) antidepressant commonly prescribed for depression, anxiety disorders, obsessive-compulsive disorder (OCD), post-traumatic stress disorder (PTSD), and panic disorder. It works by increasing levels of serotonin, a chemical messenger in the brain that helps regulate mood.

SSRIs like paroxetine are among the most widely prescribed antidepressants in the UK. While effective for mental health conditions, they can sometimes cause sexual side effects, including reduced libido, difficulty achieving orgasm, and erectile dysfunction in some men. These side effects are one reason why men taking paroxetine may seek treatment for ED.

If you are taking paroxetine, it is important never to stop or reduce your dose without consulting your GP or psychiatrist, even if you experience side effects. Stopping suddenly can cause withdrawal symptoms. Your doctor can discuss alternative treatments or strategies to manage any sexual side effects you experience.

Can Paroxetine Cause Erectile Dysfunction?

Yes, paroxetine and other SSRI antidepressants can contribute to erectile dysfunction in some men. Sexual side effects are a recognised effect of this class of medicine, though not everyone experiences them. If you believe your antidepressant is affecting your sexual function, speak to your GP—they may be able to adjust your dose, switch to a different antidepressant, or recommend ED treatment alongside your current medicine.

Sildenafil and Paroxetine: Is There an Interaction?

No major dangerous interaction is commonly reported between sildenafil and paroxetine. Unlike medicines such as nitrates, nicorandil, or riociguat—which must never be taken with sildenafil because they can cause a dangerous drop in blood pressure—paroxetine does not directly interfere with how sildenafil works.

However, paroxetine is metabolised in the liver by enzymes including CYP2D6 and CYP3A4. Sildenafil is also metabolised by CYP3A4. While paroxetine is not a potent CYP3A4 inhibitor, your prescriber will still review the combination to ensure there are no individual factors that might affect how either medicine works in your body.

During your consultation, you will be asked about all medicines you take, including antidepressants. This allows the prescriber to check for any potential interactions, adjust doses if necessary, and ensure that sildenafil is safe and appropriate for you. Never take sildenafil without declaring paroxetine or any other prescribed medicine.

What Your Prescriber Will Check

Your prescriber will review your full medical history, including your mental health treatment, cardiovascular health, blood pressure, and any other medicines you take. They will confirm that you are not taking any medicines that are contraindicated with sildenafil, such as nitrates or nicorandil. They will also consider whether your overall health makes sexual activity safe, as ED treatment is not suitable for everyone, particularly those with recent heart attacks, unstable angina, or severe heart failure [2].

How to Take Sildenafil and Paroxetine Safely Together

If your prescriber approves the combination, take each medicine exactly as directed. Sildenafil is usually taken about one hour before sexual activity, with or without food, though a high-fat meal may delay its effect. Take it no more than once in 24 hours [3]. Continue taking paroxetine as prescribed by your GP or psychiatrist—do not stop or change your dose without medical advice.

Avoid drinking large amounts of alcohol when taking sildenafil, as alcohol can worsen erectile dysfunction and increase the risk of dizziness or low blood pressure. Grapefruit juice can raise sildenafil levels in the blood and should be avoided. If you experience side effects from either medicine, contact your prescriber or GP for advice.

Be aware of warning signs that require urgent medical help: an erection lasting more than four hours, sudden loss of vision or hearing, or chest pain during sexual activity. If you experience any of these, stop taking sildenafil and seek immediate medical attention by calling 999 or going to A&E [3].

Other Antidepressants and Sildenafil: What You Need to Know

Paroxetine is one of several SSRI antidepressants. Others in the same class include sertraline, citalopram, escitalopram, and fluoxetine. Like paroxetine, these medicines are not known to have a major dangerous interaction with sildenafil, but your prescriber will still review the combination during your consultation.

Some other types of antidepressants, such as monoamine oxidase inhibitors (MAOIs) or tricyclic antidepressants, may have different considerations. If you take any antidepressant, always declare it during your consultation so the prescriber can assess the safety of ED treatment for you.

If your erectile dysfunction is related to your antidepressant, your GP may consider switching you to a different medicine with fewer sexual side effects, or they may recommend ED treatment alongside your current antidepressant. Do not make any changes to your mental health treatment without professional advice, as this can affect your wellbeing.

Medicines That Must Not Be Taken with Sildenafil

Do not take sildenafil if you are taking nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites). These combinations can cause a dangerous drop in blood pressure. Never take sildenafil with another PDE5 inhibitor such as tadalafil, vardenafil, or avanafil [3].

ED Treatment Options at Cured Pharmacy

Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering a range of ED treatments after a clinical consultation reviewed by a UK-registered prescriber. All prescription medicines are dispensed by qualified pharmacists and delivered discreetly to your door.

We offer sildenafil (generic Viagra) from £0.45 per tablet, tadalafil (generic Cialis) from £7.95, vardenafil (generic Levitra) at £16.95, and Spedra (avanafil) at £20.95. Branded Viagra and Cialis are also available. First-time customers can use code Ednew for 20% off their first order. All prices include the consultation, prescription, and delivery.

To start your consultation, visit our website and complete a short medical questionnaire. A UK prescriber will review your answers, including any medicines you currently take such as paroxetine, and approve treatment only if it is safe and appropriate for you. If you have any questions, our pharmacist-led team is here to help.

When to get urgent help

• Erection lasting more than 4 hours (priapism) – call 999 or go to A&E immediately
• Sudden loss of vision or hearing – stop taking sildenafil and seek urgent medical help
• Chest pain during sexual activity – stop and seek immediate medical attention
• Severe dizziness or fainting after taking sildenafil – contact 111 or your GP urgently

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