Sildenafil vs Viagra UK: Price & Efficacy Compared

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Sildenafil vs Viagra: Compare ED Treatment Options

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Sildenafil - UK-licensed prescription Treatment
Treatment

Sildenafil

From £0.45

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Tadalafil - UK-licensed prescription Treatment
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Tadalafil

From £9.99

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Sildenafil Eropid - UK-licensed prescription Treatment
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Sildenafil Eropid

From £8.99

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Tadalafil (Teva) - UK-licensed prescription Treatment
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Tadalafil (Teva)

From £9.99

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Avarante Tablets Tadalafil Tablets 10mg - UK-licensed prescription Treatment
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Avarante Tablets Tadalafil Tablets 10mg

From £11.49

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Viagra Connect 50mg - UK-licensed prescription Treatment
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Viagra Connect 50mg

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Sildenafil vs Viagra: Compare ED Treatment Options

Published on: June 03, 2026

When comparing sildenafil vs viagra UK comparison options, many patients discover they're evaluating the same medication in different packaging. At Cured Pharmacy, we help thousands of UK men understand that generic sildenafil contains the identical active ingredient as branded Viagra, delivering equivalent clinical outcomes at a fraction of the cost—from just £0.45 per tablet.

What's the Difference Between Sildenafil and Viagra?

Viagra is the original brand name for sildenafil citrate, developed by Pfizer and licensed by the MHRA in 1998 as the first oral treatment for erectile dysfunction [1]. When Pfizer's patent expired in 2013, other pharmaceutical manufacturers gained approval to produce generic versions containing the same active ingredient—sildenafil citrate—at identical dosages.

Generic sildenafil and branded Viagra both contain 25mg, 50mg, or 100mg of sildenafil citrate per tablet. UK medicines regulators require generic manufacturers to demonstrate bioequivalence, meaning the active ingredient must be absorbed into the bloodstream at the same rate and extent as the branded version [2]. In clinical practice, patients experience identical efficacy, safety profiles, and side effect patterns whether taking Viagra or sildenafil.

The only substantive differences lie in packaging, tablet appearance, and price. Branded Viagra carries Pfizer's distinctive blue diamond-shaped tablet and premium pricing, whilst generic sildenafil—manufactured by reputable UK-licensed suppliers including Teva, Accord, and Mylan—offers the same therapeutic effect at significantly lower cost. At Cured Pharmacy, our UK prescribers assess your suitability for sildenafil treatment regardless of brand preference, with transparent pricing displayed before your consultation.

How Sildenafil Works for Erectile Dysfunction

Sildenafil belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors. During sexual arousal, the body releases nitric oxide in the erectile tissue of the penis, which triggers production of cyclic guanosine monophosphate (cGMP)—a chemical messenger that relaxes smooth muscle and increases blood flow to the penis [1].

The enzyme PDE5 naturally breaks down cGMP, which can limit erectile response in men with ED. Sildenafil selectively inhibits PDE5, allowing cGMP levels to remain elevated for longer periods, which enhances the natural erectile response to sexual stimulation [3]. Clinical trials demonstrate that sildenafil improves erectile function in approximately 70-80% of men with ED across various underlying causes, including diabetes, cardiovascular disease, and psychological factors [1][3].

Sildenafil typically takes effect within 30-60 minutes of oral administration, with peak plasma concentrations reached after approximately one hour. The medication remains active for 4-6 hours, though this doesn't mean an erection lasts that duration—rather, it creates a window during which normal erectile response to sexual stimulation is enhanced. It's important to understand that sildenafil requires sexual arousal to work; it doesn't produce automatic erections and won't affect you when you're not sexually stimulated.

Sildenafil vs Viagra: Price Comparison UK

Why Generic Sildenafil Costs Less

The substantial price difference between branded Viagra and generic sildenafil reflects pharmaceutical economics rather than quality differences. Pfizer invested heavily in sildenafil's initial research, clinical trials, and regulatory approval—costs recouped through premium pricing during their patent exclusivity period. Once patents expire, generic manufacturers produce the same medication without these research and development costs, passing savings to patients [2].

At Cured Pharmacy, sildenafil starts from £0.45 per tablet, whilst branded Viagra Connect costs from £0.45—a difference of over 2,400% for identical therapeutic effect. Both options undergo the same rigorous MHRA quality standards, contain pharmaceutical-grade sildenafil citrate, and deliver equivalent clinical outcomes. Our UK-registered clinical team prescribes based on medical suitability rather than brand preference, ensuring you receive appropriate treatment at the lowest possible cost.

Which ED Treatment Is Right for You?

Sildenafil vs Tadalafil: Alternative Comparison

Whilst sildenafil and Viagra are identical medications, some patients explore tadalafil (branded as Cialis) as an alternative PDE5 inhibitor. Tadalafil offers a significantly longer duration of action—up to 36 hours compared to sildenafil's 4-6 hours—which some men prefer for spontaneity [4]. However, tadalafil typically costs more than generic sildenafil, with prices at Cured Pharmacy starting from £0.45.

Your choice between sildenafil and tadalafil depends on lifestyle factors, frequency of sexual activity, and personal preference rather than efficacy differences. Both medications demonstrate similar success rates in clinical trials, with approximately 70-80% of men reporting improved erectile function [3][4]. Our UK prescribers assess your medical history, current medications, and cardiovascular health during your free online consultation to recommend the most suitable option.

Safety Profile and Side Effects

Common Side Effects of Sildenafil

Sildenafil is generally well-tolerated, with most side effects being mild to moderate and transient. The most commonly reported side effects include headache (affecting approximately 16% of users), facial flushing (10%), indigestion (7%), and nasal congestion (4%) [1][3]. These effects typically diminish with continued use as your body adjusts to the medication.

Rare but serious side effects require immediate medical attention, including sudden vision or hearing loss, chest pain during sexual activity, or an erection lasting more than four hours (priapism). Sildenafil is contraindicated in men taking nitrate medications for angina, as the combination can cause dangerous drops in blood pressure [2]. Our UK prescribers carefully screen for these contraindications during your clinical assessment to ensure sildenafil is safe for you.

How to Order Sildenafil from Cured Pharmacy

Ordering sildenafil from Cured Pharmacy follows a straightforward, clinically-governed process designed to ensure your safety whilst maintaining complete discretion. You'll begin by completing a free online consultation—a medical questionnaire reviewed by our UK-registered prescribers that typically takes under three minutes to complete. This assessment covers your medical history, current medications, cardiovascular health, and any contraindications to PDE5 inhibitor therapy.

If our prescriber determines sildenafil is clinically appropriate for you, we'll dispense your medication from our UK-registered pharmacy (GPhC 9012511) with discreet, unmarked packaging delivered directly to your door. You'll see transparent pricing before completing your consultation—no hidden fees or surprise charges. Our superintendent pharmacist, Tarun Kumar (GPhC 2233073), oversees all clinical services to ensure compliance with MHRA and GPhC standards.

We stock multiple sildenafil formulations to suit different preferences and budgets, including standard generic sildenafil from £0.45, Sildenafil Eropid from £0.45, and branded Viagra Connect from £0.45. All contain the same active ingredient at identical dosages, with your choice reflecting personal preference rather than clinical differences. Our team remains available on (+44) 116 4646009 if you have questions before, during, or after your consultation.

Scientific References

  1. 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://doi.org/10.1056/NEJM199805143382001 [accessed 13 August 2026]
  2. Medicines and Healthcare products Regulatory Agency. (2020). Bioequivalence guidance for generic medicines. GOV.UK. https://www.gov.uk/guidance/bioequivalence-guidance [accessed 13 August 2026]
  3. Carson, C. C., & Lue, T. F. (2005). Phosphodiesterase type 5 inhibitors for erectile dysfunction. BJU International, 96(3), 257–280. https://doi.org/10.1111/j.1464-410X.2005.05614.x [accessed 13 August 2026]
  4. Montorsi, F., Padma-Nathan, H., Buvat, J., Schwaibold, H., Beneke, M., Ulbrich, E., Bandel, T. J., & Porst, H. (2004). Earliest time to onset of action leading to successful intercourse with tadalafil versus sildenafil in men with erectile dysfunction. Journal of Sexual Medicine, 1(2), 168–178. https://doi.org/10.1111/j.1743-6109.2004.04026.x [accessed 13 August 2026]
  5. NHS. (2026). Erectile dysfunction (impotence). https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ Accessed 13 August 2026.

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

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Faq

Is sildenafil as effective as Viagra?
Yes. Generic sildenafil contains the identical active ingredient at the same dosages as branded Viagra, delivering equivalent clinical efficacy. UK medicines regulators require generic manufacturers to demonstrate bioequivalence, ensuring sildenafil works exactly the same way in your body.
Why is sildenafil cheaper than Viagra?
Generic sildenafil costs less because manufacturers don't bear the research and development costs Pfizer incurred creating the original medication. Both undergo identical MHRA quality standards, with the price difference reflecting pharmaceutical economics rather than quality variations.
Can I buy sildenafil vs Viagra without prescription UK?
No. Both sildenafil and prescription-strength Viagra require clinical assessment by a UK prescriber. Viagra Connect (50mg only) is available through pharmacist consultation, but all other strengths need a prescription following medical evaluation.
How long does sildenafil take to work?
Sildenafil typically takes effect within 30-60 minutes of oral administration, with peak concentrations reached after approximately one hour. Taking it on an empty stomach may speed absorption, whilst high-fat meals can delay onset.
What's the best dose of sildenafil to start with?
Most UK prescribers recommend starting with sildenafil 50mg, adjusting to 25mg if side effects occur or increasing to 100mg if the response is insufficient. Your prescriber determines the appropriate starting dose based on your medical assessment.
Can I take sildenafil with alcohol?
Moderate alcohol consumption (1-2 units) is generally safe with sildenafil, though excessive drinking can impair erectile function and increase risk of side effects like dizziness or low blood pressure. Our prescribers provide personalised guidance during consultation.
Is sildenafil safe for men with diabetes?
Yes, when prescribed appropriately. Clinical trials show sildenafil effectively treats ED in men with diabetes, with similar efficacy and safety profiles to the general population. Your prescriber will assess your overall cardiovascular health and diabetes control during consultation.
What's the difference between sildenafil and tadalafil?
Both are PDE5 inhibitors with similar efficacy, but tadalafil lasts up to 36 hours compared to sildenafil's 4-6 hours. Sildenafil typically costs less and works slightly faster, whilst tadalafil offers greater spontaneity for men who prefer not timing doses around sexual activity.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 13 August 2026

Last updated on 13 August 2026.

Review History

Our experts continually monitor new findings in health and medicine, and we update our articles when new information becomes available.

Why this page was updated on 13 August 2026

Content checked and updated as part of our periodic review, to ensure accuracy and currentness.

Current version (13 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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