Sildenafil and Pregabalin: Can They Be Taken Together?

Sildenafil and Pregabalin: Understanding the Interaction

Published: 16 October 2026

Many men taking pregabalin for nerve pain or anxiety wonder whether sildenafil and pregabalin can be used together safely. The good news is that no major direct interaction between these two medicines is commonly reported, and they are often prescribed together when clinically appropriate. However, both medicines can cause dizziness and drowsiness, and your prescriber will carefully check your full medical history and current medications during your consultation to ensure the combination is suitable for you.

What is sildenafil and pregabalin used for?

Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor licensed to treat erectile dysfunction in men [3]. It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused. 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 can help you achieve and maintain an erection sufficient for intercourse. Sexual stimulation is still needed for the medicine to work.

Pregabalin is a medicine used to treat nerve pain (neuropathic pain), generalised anxiety disorder, and epilepsy. It works by calming overactive nerve signals in the brain and nervous system. Common brand names include Lyrica. Pregabalin is usually taken two or three times a day, and it can cause side effects such as dizziness, drowsiness, blurred vision, and difficulty concentrating, especially when you first start treatment or when the dose is increased.

Can you take sildenafil and pregabalin together?

There is no major direct pharmacological interaction between sildenafil and pregabalin, and the two medicines are often prescribed together when clinically appropriate. Pregabalin does not significantly affect the way sildenafil is broken down in the body, and sildenafil does not interfere with pregabalin's mechanism of action. This means that, for many men, taking both medicines is considered safe under medical supervision.

However, both medicines can cause dizziness and drowsiness as side effects. When taken together, these effects may be more noticeable, particularly when you first start treatment, after a dose increase, or if you also drink alcohol. Your prescriber will review your full medication list, medical history, and any other conditions during your online consultation to ensure that the combination is suitable and safe for you. It is important to declare all medicines you are taking, including over-the-counter products and supplements.

How the combination is assessed

During your consultation, the prescriber will check for any conditions that might make sildenafil unsuitable, such as recent heart attack or stroke, severe heart failure, very low blood pressure, or use of nitrate medicines (which must never be taken with sildenafil). They will also consider whether pregabalin is well-controlled and whether you experience significant side effects such as severe dizziness or drowsiness. If you are stable on pregabalin and have no contraindications to sildenafil, the combination is usually considered safe.

What your prescriber checks before approving sildenafil and pregabalin

Your prescriber will ask about your current dose of pregabalin, how long you have been taking it, and whether you experience side effects such as dizziness, drowsiness, or blurred vision. They will also check whether you are taking any other medicines that can interact with sildenafil, including nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, alpha-blockers (such as doxazosin or tamsulosin), or medicines that affect how sildenafil is broken down in the liver, such as ritonavir, ketoconazole, or clarithromycin [3].

Your prescriber will review your cardiovascular health, including blood pressure, history of heart disease, stroke, or angina, and whether sexual activity is safe for you. They will also ask about any history of sudden vision or hearing loss, priapism (prolonged erection), or inherited retinal disorders. If you are taking alpha-blockers for prostate symptoms or high blood pressure, you should be stable on that treatment before starting sildenafil, and you will usually be started on the lowest dose to minimise the risk of a sudden drop in blood pressure [3].

Practical advice when taking sildenafil and pregabalin together

If you are prescribed sildenafil while taking pregabalin, start with the lowest effective dose of sildenafil and see how you respond. Take sildenafil about one hour before sexual activity, on an empty stomach or after a light meal, as a heavy or high-fat meal can delay its effect. Avoid drinking large amounts of alcohol, as this can worsen erectile dysfunction, increase the risk of dizziness and low blood pressure, and make it harder to achieve an erection [1][3].

Be aware that both medicines can cause dizziness, especially when standing up quickly. Take your time when getting up from sitting or lying down, particularly in the first few hours after taking sildenafil. If you feel dizzy, lightheaded, or faint, sit or lie down until the feeling passes. Do not drive or operate machinery if you feel drowsy or your vision is affected. If you experience any new or worsening side effects after starting sildenafil, contact your prescriber or pharmacist for advice.

When to seek urgent help

Seek immediate medical help if you develop an erection that lasts longer than four hours (priapism), as this requires urgent treatment to prevent permanent damage. Contact 999 or go to A&E if you experience sudden loss of vision or hearing, severe chest pain during sex, or signs of a serious allergic reaction such as swelling of the face, lips, or throat and difficulty breathing. If you feel very dizzy, faint, or your heart is racing or pounding, stop sexual activity and seek medical advice promptly.

Other medicines that interact with sildenafil

Sildenafil must never be taken with nitrate medicines (such as glyceryl trinitrate spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites). The combination can cause a dangerous and potentially life-threatening drop in blood pressure [3]. You must also not take sildenafil with another PDE5 inhibitor such as tadalafil, vardenafil, or avanafil.

Alpha-blockers used for prostate symptoms or high blood pressure (such as doxazosin, tamsulosin, alfuzosin, or terazosin) can increase the risk of low blood pressure and dizziness when taken with sildenafil. If you are taking an alpha-blocker, you should be stable on that treatment and start sildenafil at the lowest dose [3]. Potent CYP3A4 inhibitors, including ritonavir, cobicistat, Paxlovid, ketoconazole, itraconazole, and clarithromycin, can raise sildenafil levels in the blood, requiring a lower starting dose. CYP3A4 inducers such as rifampicin, carbamazepine, phenytoin, and St John's wort can reduce sildenafil's effectiveness. Always declare all medicines, including over-the-counter products and herbal supplements, during your consultation.

How to get sildenafil from Cured Pharmacy

Sildenafil is a prescription-only medicine in the UK, and you will need to complete an online consultation before it can be supplied. The consultation is reviewed by a UK-registered prescriber who will check your medical history, current medicines (including pregabalin), and any conditions that might make sildenafil unsuitable. If approved, your medicine is dispensed by our GPhC-registered pharmacy and delivered discreetly to your door.

Cured Pharmacy offers a range of erectile dysfunction treatments, including generic sildenafil from £0.45 per tablet (£0.36 with first-order code Ednew), tadalafil from £7.95 (£6.36 with code Ednew), and other options such as vardenafil and Spedra. All consultations are confidential, and our pharmacists are available to answer any questions about your treatment. If you have new or worsening erectile dysfunction, we encourage you to see your GP, as ED can be an early sign of underlying health conditions such as diabetes or heart disease [1][2].

What to expect during your consultation

You will be asked about your general health, any heart or blood pressure problems, current medicines (including pregabalin and any other prescription or over-the-counter products), and whether you have any allergies. The prescriber will check whether sildenafil is safe and appropriate for you, and may suggest starting with a lower dose if you are taking certain other medicines or have particular health conditions. If sildenafil is not suitable, the prescriber may recommend an alternative treatment or advise you to see your GP for further assessment.

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]

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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