Can You Take Sildenafil and Citalopram Together?

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Sildenafil and Citalopram: Understanding the Interaction

Published: 16 October 2026

Many men wonder whether sildenafil and citalopram can be taken together safely. The good news is that there is no major drug interaction between sildenafil (Viagra) and citalopram, a commonly prescribed antidepressant. However, your prescriber will still need to review your full medical history and current medications to ensure the combination is suitable for you, as both medicines can affect blood pressure and other body systems.

What is Sildenafil and What is Citalopram?

Sildenafil is a medicine used to treat erectile dysfunction (ED). 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 [3]. Sildenafil is the active ingredient in Viagra and is available in 25mg, 50mg, and 100mg tablets. You typically take it about one hour before sexual activity, and it works only when you are sexually stimulated.

Citalopram is an antidepressant from the selective serotonin reuptake inhibitor (SSRI) family. It is commonly prescribed for depression and anxiety disorders. Citalopram works by increasing levels of serotonin, a chemical messenger in the brain that helps regulate mood. Like other SSRIs, citalopram can sometimes cause sexual side effects, including erectile dysfunction, reduced libido, or delayed ejaculation, which is one reason some men taking citalopram may also need treatment for ED [1].

Is There an Interaction Between Sildenafil and Citalopram?

There is no major pharmacological interaction between sildenafil and citalopram that would make the combination unsafe [3]. Sildenafil is primarily broken down in the liver by an enzyme called CYP3A4, and citalopram does not significantly affect this enzyme. This means citalopram is unlikely to raise or lower sildenafil levels in your bloodstream in a clinically meaningful way.

However, both medicines can have effects on your cardiovascular system. Sildenafil can cause a small drop in blood pressure, and citalopram has been associated with changes in heart rhythm (QT prolongation) at higher doses. Your prescriber will consider these factors together, along with any other medicines you take and your overall health, to ensure the combination is appropriate for you. It is important to declare all your current medications, including over-the-counter products and supplements, during your consultation.

Why Citalopram May Contribute to ED

SSRIs like citalopram are well known for causing sexual side effects in some people. These can include difficulty getting or keeping an erection, reduced sexual desire, and problems with ejaculation [1]. The exact reason is not fully understood, but it is thought to relate to increased serotonin levels affecting other chemical pathways involved in sexual function. If you have noticed ED symptoms since starting citalopram, it is worth discussing this with your GP. Sometimes adjusting the dose, switching to a different antidepressant, or adding ED treatment can help, but never stop or change your antidepressant without medical advice, as this can worsen your mental health.

What Your Prescriber Will Check Before Prescribing Sildenafil

When you request sildenafil, your prescriber will ask about your full medical history, including any heart conditions, blood pressure problems, liver or kidney disease, and any history of stroke or eye problems [2]. They will review all your current medicines to check for interactions, particularly with nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, alpha-blockers, or other blood-pressure medicines. If you take any of these, your prescriber will assess whether sildenafil is safe or whether a dose adjustment is needed.

Your prescriber will also want to know about your mental health and whether your depression or anxiety is well controlled. Erectile dysfunction can have both physical and psychological causes, and untreated depression or anxiety can contribute to ED [10]. If your citalopram dose has recently changed or if you are experiencing side effects, your prescriber may discuss this with you or suggest you speak to your GP. The goal is to treat both your mental health and your sexual health safely and effectively.

Practical Advice for Taking Sildenafil and Citalopram Together

If your prescriber approves sildenafil for you, take it exactly as directed. Sildenafil is usually taken about one hour before sexual activity, with or without food, though a heavy or high-fat meal may delay its effect [3]. The usual starting dose is 50mg, but your prescriber may recommend 25mg if you have other health conditions or take certain other medicines. Do not take sildenafil more than once in 24 hours.

Continue taking your citalopram as prescribed by your GP. Do not stop or reduce your antidepressant dose in the hope that it will improve your erections, as this can lead to withdrawal symptoms and a return of depression or anxiety. If you experience dizziness or light-headedness when taking sildenafil, sit or lie down until it passes, and avoid driving or operating machinery if affected. Limit alcohol, as heavy drinking can make erectile dysfunction worse and increase the risk of side effects such as dizziness or low blood pressure [1].

When to Speak to Your GP

If you have recently developed erectile dysfunction, it is important to see your GP for a full assessment. ED can be an early warning sign of cardiovascular disease or diabetes, and identifying the underlying cause is essential [1][2]. Your GP can check your blood pressure, blood sugar, cholesterol, and hormone levels, and review whether any of your medicines might be contributing. If citalopram is causing troublesome sexual side effects, your GP may be able to adjust your treatment. Never stop an antidepressant suddenly without medical advice.

Other ED Treatments Available at Cured Pharmacy

Sildenafil is just one option for treating erectile dysfunction. Cured Pharmacy offers a range of licensed ED medicines, all available after an online consultation reviewed by a UK prescriber. Tadalafil (generic Cialis) is another popular choice; it can be taken on-demand (10mg or 20mg at least 30 minutes before sex, with effects lasting up to 36 hours) or as a daily low-dose tablet (2.5mg or 5mg) [4]. Daily tadalafil can be helpful if you want to be ready for sex at any time without planning ahead.

Other options include vardenafil (generic Levitra), which is taken 25–60 minutes before sex [5], and avanafil (Spedra), which can work in as little as 15–30 minutes [6]. All these medicines are PDE5 inhibitors and work in a similar way to sildenafil. Your prescriber will help you choose the most suitable treatment based on your health, lifestyle, and preferences. Remember, all PDE5 inhibitors require sexual stimulation to work and should never be taken with nitrates, nicorandil, riociguat, or poppers, as this can cause a dangerous drop in blood pressure [3].

Warning Signs and When to Seek Urgent Help

Most men tolerate sildenafil well, but you should be aware of some important warning signs. If you develop chest pain during or after sex, stop sexual activity immediately and seek urgent medical help, especially if the pain spreads to your arms, neck, or jaw [3]. Do not take nitrate medicines (such as GTN spray) if you have used sildenafil in the past 24 hours, as the combination can be dangerous.

Seek urgent medical attention if you experience a sudden loss of vision in one or both eyes, as this may be a sign of a rare condition called non-arteritic anterior ischaemic optic neuropathy (NAION) [3]. Similarly, sudden hearing loss or ringing in the ears requires prompt assessment. If you have an erection lasting more than four hours (priapism), go to A&E immediately, as this can cause permanent damage if not treated quickly. These side effects are rare, but it is important to know the warning signs.

Common Side Effects of Sildenafil

The most common side effects of sildenafil include headache, flushing (redness of the face or neck), indigestion, and nasal congestion [3]. Some men notice temporary changes in vision, such as a blue tinge or increased sensitivity to light. These effects are usually mild and go away on their own. If side effects are troublesome or persistent, speak to your prescriber, as a lower dose may help. Always read the patient information leaflet that comes with your medicine for a full list of possible side effects and what to do if you experience them.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 16 October 2026]
2. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 16 October 2026]
3. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 16 October 2026]
4. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 16 October 2026]
5. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 16 October 2026]
6. Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 16 October 2026]
7. Feldman, H. A., Goldstein, I., Hatzichristou, D. G., Krane, R. J., & McKinlay, J. B. (1994). Impotence and its medical and psychosocial correlates: Results of the Massachusetts Male Aging Study. Journal of Urology, 151(1), 54–61. https://pubmed.ncbi.nlm.nih.gov/8254833/ [accessed 16 October 2026]

Information on this page is for educational purposes only and is not medical advice. Prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting or changing any medication.

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