Sildenafil Chewable Tablets: UK Availability Explained
Learn what sildenafil formulations are licensed in the UK and explore fast-acting alternatives with our pharmacist-led service.
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Sildenafil Chewable Tablets: What's Available in the UK?
Published: 7 November 2026
Sildenafil chewable tablets are not currently licensed or widely available in the UK for erectile dysfunction treatment. The standard licensed formulations of sildenafil (the active ingredient in Viagra) are film-coated tablets that you swallow whole with water, available in 25mg, 50mg, and 100mg strengths. While some countries have approved chewable or orodispersible versions of sildenafil, these are not routinely available through UK pharmacies at present, and any sildenafil product must be prescribed after a clinical assessment by a UK-registered prescriber.
Want faster results?
If you need a quicker onset, ask your prescriber about avanafil (Spedra), which can work in as little as 15 to 30 minutes. It is a licensed UK option and may suit men seeking more spontaneity.
Why sildenafil chewable tablets aren't standard in the UK
The Medicines and Healthcare products Regulatory Agency (MHRA) licenses medicines for use in the UK, and currently only standard film-coated sildenafil tablets have marketing authorisation for erectile dysfunction [3]. Chewable or orodispersible formulations would need separate regulatory approval, clinical trial data, and a manufacturer willing to bring them to market.
Standard sildenafil tablets are designed to be swallowed whole. They dissolve in the stomach and are absorbed through the gut wall, typically taking effect within 30 to 60 minutes [3]. The film coating protects the active ingredient and ensures consistent absorption. Chewing a standard tablet is not recommended because it can alter the release profile and may cause an unpleasant taste.
Some patients ask about chewable forms because they have difficulty swallowing tablets (dysphagia) or hope for faster onset. However, the licensed UK products are effective and well-tolerated when taken as directed, and faster-acting alternatives do exist within the licensed range.
How standard sildenafil tablets work for erectile dysfunction
Sildenafil belongs to a class of medicines called PDE5 inhibitors. It works by relaxing blood vessels in the penis, allowing increased blood flow when you are sexually aroused [1][3]. Crucially, sildenafil does not cause an erection on its own—sexual stimulation is still needed for the medicine to work.
After swallowing a tablet, sildenafil is absorbed from the gut and reaches peak levels in the bloodstream within about one hour [3]. The effect can last for up to four hours, giving a window of opportunity for sexual activity. Taking sildenafil on an empty stomach may speed absorption slightly, while a heavy or high-fat meal can delay it [3].
Clinical trials have shown that sildenafil significantly improves the ability to achieve and maintain an erection suitable for intercourse in men with erectile dysfunction [9]. It is effective across a range of underlying causes, including diabetes, cardiovascular disease, and psychological factors [10]. The usual starting dose is 50mg, taken about one hour before sexual activity, with adjustments made based on response and tolerability [3].
What to expect when taking sildenafil
Plan to take your dose roughly one hour before you anticipate sexual activity. You should not take sildenafil more than once in 24 hours [3]. Common side effects include headache, facial flushing, indigestion, and nasal congestion; these are usually mild and short-lived [3]. If you experience chest pain during sex, dizziness, or an erection lasting more than four hours, seek urgent medical help.
When to get urgent help
- An erection lasting more than 4 hours (priapism) – go to A&E immediately
- Sudden loss of vision or hearing after taking sildenafil – seek urgent medical attention
- Chest pain during or after sexual activity – call 999 and do not take more sildenafil
- Severe dizziness, fainting, or allergic reaction (rash, swelling, difficulty breathing) – call 999
Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.
Faster-acting alternatives to sildenafil chewable tablets
If you are looking for a quicker onset of action, avanafil (brand name Spedra) is a licensed PDE5 inhibitor that can work in as little as 15 to 30 minutes [6][11]. It is taken on demand, about 15 to 30 minutes before sexual activity, and may be a good option if you want more spontaneity. Avanafil is available in 50mg, 100mg, and 200mg tablets and works in the same way as sildenafil, requiring sexual stimulation to be effective [6].
Vardenafil (generic Levitra) is another option, typically taken 25 to 60 minutes before sex [5]. Some men find vardenafil works slightly faster than sildenafil, though individual responses vary. Tadalafil (generic Cialis) has a different profile: the on-demand dose (10mg or 20mg) can be taken at least 30 minutes before sex, and its effect can last up to 36 hours, offering a longer window [4].
For those who prefer not to take tablets at all, Eroxon is a topical gel medical device applied directly to the penis and available without prescription. Vitaros (alprostadil cream) and Caverject (alprostadil injection) are prescription-only alternatives that work locally rather than systemically [7]. Your prescriber can discuss which option best suits your needs and medical history.
Sildenafil chewable tablets: safety and suitability
Even if chewable sildenafil formulations were available in the UK, the same safety considerations would apply as for standard tablets. Sildenafil must never be taken with nitrates (such as GTN spray, isosorbide mononitrate, or isosorbide dinitrate), nicorandil, riociguat, or recreational drugs known as 'poppers' (amyl or alkyl nitrites) [3]. Combining these can cause a dangerous drop in blood pressure.
Men taking alpha-blockers for prostate symptoms (such as tamsulosin or doxazosin) need careful assessment, as the combination with sildenafil can also lower blood pressure [3]. You should be stable on your alpha-blocker and start on the lowest dose of sildenafil. Certain medicines that affect liver enzymes—particularly potent CYP3A4 inhibitors like ritonavir, cobicistat, ketoconazole, or clarithromycin—can raise sildenafil levels, requiring dose adjustment [3].
Sildenafil is not suitable if you have been advised to avoid sexual activity (for example, after a recent heart attack or stroke, or if you have severe heart failure), if you have very low blood pressure, or if you have had sudden vision loss in the past (a condition called NAION) [3]. A full medical history and current medication review are essential before any PDE5 inhibitor is prescribed.
Who can prescribe sildenafil?
All sildenafil products for erectile dysfunction in the UK are prescription-only medicines (with the exception of Viagra Connect 50mg, a pharmacy medicine available after a pharmacist consultation for men aged 18 and over). At Cured Pharmacy, every order is reviewed by a UK-registered prescriber following an online consultation to ensure the treatment is safe and appropriate for you.
At a glance
What to do if you have trouble swallowing sildenafil tablets
If you find it difficult to swallow tablets, speak to your prescriber or pharmacist. Do not chew or crush standard sildenafil film-coated tablets unless specifically advised, as this can affect how the medicine is absorbed and may cause an unpleasant taste. Some people find it easier to take tablets with a larger volume of water, or by placing the tablet on the tongue and swallowing with a drink immediately.
In some cases, a different formulation or a different PDE5 inhibitor may be more suitable. For example, if swallowing is a significant issue, topical treatments like Eroxon gel or prescription alprostadil cream (Vitaros) may be considered [7]. These are applied directly to the penis and do not need to be swallowed. Your healthcare provider can discuss the pros and cons of each option.
If dysphagia (difficulty swallowing) is a new or worsening symptom, it is important to see your GP, as it can sometimes indicate an underlying medical condition that needs investigation [1]. Never modify how you take a medicine without professional advice.
Getting sildenafil and other ED treatments from Cured Pharmacy
Cured Pharmacy is a GPhC-registered online pharmacy (GPhC 9012511) offering a range of licensed erectile dysfunction treatments. All prescription medicines are dispensed only after a confidential online consultation reviewed by a UK-registered prescriber. You will be asked about your medical history, current medications, and any other health conditions to ensure the treatment is safe and suitable for you [2].
We stock generic sildenafil from £0.45 per tablet (£0.36 with first-order code Ednew), as well as branded Viagra, tadalafil (generic Cialis), vardenafil (generic Levitra), and avanafil (Spedra). Prices include the clinical consultation and delivery. You can compare options, choose the strength and quantity that suits you, and complete the process discreetly from home.
If you are experiencing erectile dysfunction for the first time, or if it has worsened recently, we strongly encourage you to see your GP as well. ED can be an early warning sign of cardiovascular disease or diabetes, and addressing underlying health issues is an important part of overall treatment [1][2]. Online pharmacies complement, but do not replace, face-to-face medical care.
Why choose Cured Pharmacy?
Our service is led by experienced UK pharmacists and prescribers who understand that ED is a common and treatable condition. We offer clear information, genuine choice, and transparent pricing with no hidden fees. Every order is handled confidentially, and our team is available to answer questions about your treatment at any stage.
In summary
- Sildenafil chewable tablets are not currently licensed or available in the UK for erectile dysfunction.
- Standard sildenafil tablets should be swallowed whole, not chewed, for safe and effective absorption.
- Avanafil works in 15–30 minutes and is the fastest-acting licensed PDE5 inhibitor in the UK.
- If swallowing tablets is difficult, speak to your prescriber about topical or alternative treatments.
- All sildenafil products require a prescription after a clinical consultation to ensure safety.
Scientific References
- NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 7 November 2026]
- National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 7 November 2026]
- Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 7 November 2026]
- Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 7 November 2026]
- Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 7 November 2026]
- Goldstein, I., Lue, T. F., Padma-Nathan, H., Rosen, R. C., Steers, W. D., & Wicker, P. A. (1998). Oral sildenafil in the treatment of erectile dysfunction. New England Journal of Medicine, 338(20), 1397–1404. https://pubmed.ncbi.nlm.nih.gov/9580646/ [accessed 7 November 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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Medically reviewed by
Tarun Kumar, Superintendent Pharmacist (GPhC 2233073)