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Viagra vs Sildenafil: Comparing Your ED Treatment Options

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Sildenafil - UK-licensed prescription Treatment
Treatment

Sildenafil

From £0.45

Future orders save 5%
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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

Future orders save 5%
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Tadalafil (Teva) - UK-licensed prescription Treatment
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Tadalafil (Teva)

From £9.99

Future orders save 5%
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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

From £11.49

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Viagra vs Sildenafil: Comparing Your ED Treatment Options

Published on: June 03, 2026

When comparing viagra vs sildenafil uk options, many patients are surprised to learn they contain the exact same active pharmaceutical ingredient at identical concentrations. At Cured Pharmacy, we offer both branded Viagra Connect and generic sildenafil from £0.45, with transparent pricing and expert guidance from our UK-registered clinical team to help you choose the most cost-effective treatment for your needs.

The Truth About Viagra vs Sildenafil: Are They Really Different?

Viagra and sildenafil are pharmaceutically identical medications. Sildenafil citrate is the active ingredient in both products, working as a selective phosphodiesterase type 5 (PDE5) inhibitor that enhances blood flow to the penis during sexual stimulation [1]. The only difference lies in branding: Viagra is the original branded product manufactured by Pfizer, while sildenafil refers to the generic versions produced by multiple MHRA-licensed manufacturers after Pfizer's patent expired in 2013.

Clinical studies consistently demonstrate that generic sildenafil produces identical efficacy and safety profiles to branded Viagra when taken at equivalent doses [2]. Both medications contain the same active pharmaceutical ingredient at the same concentrations (typically 25mg, 50mg, or 100mg), are absorbed at the same rate, and produce effects within 30-60 minutes that last approximately 4-6 hours. The MHRA requires all generic medications to demonstrate bioequivalence to the original branded product, meaning they must deliver the same amount of active ingredient into the bloodstream at the same rate [3].

The primary distinction between Viagra and sildenafil in the UK market is price. Generic sildenafil costs significantly less than branded Viagra because generic manufacturers don't bear the research, development, and marketing costs associated with bringing a new medication to market. At Cured Pharmacy, sildenafil is available from £0.45 per tablet, offering substantial savings compared to branded alternatives whilst delivering identical clinical outcomes.

How Sildenafil Works for Erectile Dysfunction

Sildenafil citrate works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which normally breaks down cyclic guanosine monophosphate (cGMP) in the smooth muscle cells lining blood vessels [1]. During sexual arousal, nitric oxide is released in the erectile tissue of the penis, triggering cGMP production. This chemical messenger relaxes smooth muscle and dilates blood vessels, allowing increased blood flow into the corpora cavernosa — the spongy tissue that becomes engorged during an erection.

By blocking PDE5, sildenafil allows cGMP to accumulate to higher levels and persist for longer periods, enhancing the natural erectile response to sexual stimulation [2]. It's crucial to understand that sildenafil doesn't create spontaneous erections or increase sexual desire — it simply amplifies the body's natural erectile mechanism when sexual arousal is present. This is why sexual stimulation remains necessary for the medication to produce effects.

Clinical trials demonstrate that sildenafil improves erectile function in approximately 70-80% of men with erectile dysfunction across various underlying causes, including diabetes, cardiovascular disease, and psychological factors [4]. The medication is typically taken 30-60 minutes before anticipated sexual activity, with effects lasting 4-6 hours. Peak plasma concentrations occur approximately 60 minutes after oral administration on an empty stomach, though high-fat meals can delay absorption by up to an hour.

Optimal Dosing and Timing

The standard starting dose for sildenafil is 50mg, taken approximately one hour before sexual activity [1]. Based on individual response and tolerability, your UK prescriber may adjust this to 25mg (for those experiencing side effects or taking certain medications) or increase to 100mg for enhanced efficacy. The maximum recommended dosing frequency is once per 24-hour period. Taking sildenafil on an empty stomach typically produces faster onset of action, whilst absorption may be delayed if taken with a heavy or high-fat meal.

Viagra vs Sildenafil: Price Comparison in the UK

The cost difference between branded Viagra and generic sildenafil represents one of the most significant factors in treatment selection for UK patients. Generic sildenafil offers identical therapeutic benefits at a fraction of the price, with savings that can exceed substantial percentages over time for men requiring ongoing treatment.

At Cured Pharmacy, generic sildenafil is available from £0.45 per tablet, making it one of the most affordable erectile dysfunction treatments in the UK market. This transparent pricing includes your free online consultation with a UK-registered prescriber, dispensing by our GPhC-registered pharmacy team, and discreet delivery to your door. All prices are displayed upfront before you begin your consultation, with no hidden fees or subscription requirements.

The price difference exists purely because generic manufacturers don't incur the research, development, and marketing expenses that Pfizer invested in bringing Viagra to market. Once patent protection expired, multiple pharmaceutical companies gained approval to produce bioequivalent versions using the same active ingredient and manufacturing standards required by the MHRA. This competition among generic manufacturers drives prices down whilst maintaining the same quality, safety, and efficacy standards.

Long-Term Cost Considerations

For men requiring regular erectile dysfunction treatment, choosing generic sildenafil over branded alternatives can result in substantial annual savings. If you take sildenafil twice weekly, the cost difference compounds significantly over months and years. Our superintendent pharmacist Tarun Kumar regularly advises patients that generic sildenafil offers the same clinical outcomes as branded products, making it the logical choice for cost-conscious patients seeking effective ED treatment.

Treatment Active Ingredient Duration Starting Price
Sildenafil (Generic) Sildenafil citrate 4-6 hours From £0.45
Viagra Connect Sildenafil citrate 4-6 hours From £11.49
Tadalafil (Generic) Tadalafil Up to 36 hours From £9.99
Cialis Tadalafil Up to 36 hours From £53.00
Sildenafil Eropid Sildenafil citrate 4-6 hours From £8.99

Sildenafil vs Tadalafil: Choosing the Right PDE5 Inhibitor

Whilst sildenafil remains the most widely prescribed erectile dysfunction medication in the UK, tadalafil (the active ingredient in Cialis) offers an alternative PDE5 inhibitor with distinct pharmacological properties that may better suit certain patients' lifestyles and preferences.

The primary difference lies in duration of action. Sildenafil effects last approximately 4-6 hours, making it ideal for planned sexual activity [1]. Tadalafil, by contrast, remains active for up to 36 hours, earning it the nickname 'the weekend pill' [5]. This extended window allows for greater spontaneity, as men don't need to time sexual activity as precisely around medication administration. Additionally, tadalafil can be taken as a lower daily dose for continuous erectile support, whereas sildenafil is typically used on-demand.

Both medications demonstrate similar efficacy rates and side effect profiles, as they work through the same PDE5 inhibition mechanism [5]. The choice often comes down to personal preference regarding timing flexibility, frequency of sexual activity, and individual response. Some men find sildenafil's shorter duration preferable if they experience side effects, whilst others value tadalafil's extended effectiveness. At Cured Pharmacy, tadalafil is available from £0.45, and our clinical team can help determine which option aligns best with your needs during your free consultation.

Safety Profile and Side Effects: What to Expect

Sildenafil has been extensively studied since its approval in 1998, with a well-established safety profile across millions of patient-years of use [2]. The most common side effects are generally mild to moderate and include headache (occurring in approximately 16% of patients), facial flushing (10%), dyspepsia or indigestion (7%), nasal congestion (4%), and visual disturbances such as increased light sensitivity or blue-tinged vision (3%) [4].

These side effects typically diminish with continued use as the body adapts to the medication. They occur because PDE5 enzymes are present not only in penile tissue but also in blood vessel walls throughout the body, smooth muscle in the digestive tract, and photoreceptor cells in the retina. The visual effects are temporary and resolve completely when the medication is metabolised, usually within 4-6 hours.

Serious side effects are rare but require immediate medical attention. These include priapism (an erection lasting more than 4 hours, occurring in less than 1% of patients), sudden vision or hearing loss, and cardiovascular events in men with pre-existing heart conditions [3]. Sildenafil is contraindicated in patients taking nitrate medications for angina, as the combination can cause dangerous blood pressure drops. This is why clinical assessment by a UK prescriber is essential before starting treatment — our online consultation identifies potential contraindications and ensures sildenafil is safe for your individual circumstances.

Who Should Avoid Sildenafil

Sildenafil isn't suitable for everyone. Men taking nitrates or nicorandil for chest pain, those with severe liver or kidney impairment, recent stroke or heart attack patients, and those with certain inherited eye conditions should not use sildenafil [3]. Additionally, the medication requires dose adjustment or may be contraindicated in patients taking certain antifungals, antibiotics, or HIV protease inhibitors due to drug interactions. Your UK prescriber will review your complete medical history and current medications during consultation to ensure sildenafil is appropriate and safe for you.

How to Buy Sildenafil Online Safely in the UK

Purchasing erectile dysfunction medication online offers convenience and discretion, but it's essential to use legitimate UK-registered pharmacies to ensure you receive genuine, safe medication. The MHRA estimates that up to 62% of ED medications sold online come from unregistered sources and may be counterfeit, contaminated, or contain incorrect doses of active ingredient [6].

At Cured Pharmacy, we're registered with the General Pharmaceutical Council (GPhC registration 9012511), and all our prescribers are UK-registered clinicians. Our process begins with a free online consultation that takes under three minutes to complete. You'll answer questions about your medical history, current medications, and cardiovascular health — the same questions a GP would ask in person. A UK prescriber reviews your consultation within hours and, if appropriate, issues a prescription that our pharmacy team dispenses using genuine UK-licensed sildenafil.

We provide transparent upfront pricing with sildenafil from £0.45 per tablet, displayed before you begin your consultation. There are no hidden fees, subscription traps, or automatic renewals. Your medication arrives in discreet packaging with no external markings indicating contents, and you can track your order from dispatch to delivery. If you have questions at any stage, our clinical team is available by phone at (+44) 116 4646009 during business hours.

Red Flags When Buying ED Medication Online

Avoid websites that offer sildenafil without requiring a consultation, don't display GPhC registration details, are based outside the UK, or offer prices that seem unrealistically low. Legitimate online pharmacies will always require a clinical assessment, provide verifiable registration credentials, and supply medication from licensed UK pharmaceutical wholesalers. The MHRA's 'Falsified Medicines Directive' logo indicates a registered online pharmacy — look for this on any website before purchasing prescription medication.

Scientific References

  1. Corbin, J. D., & Francis, S. H. (1999). Cyclic GMP phosphodiesterase-5: target of sildenafil. Journal of Biological Chemistry, 274(20), 13729-13732. https://doi.org/10.1074/jbc.274.20.13729 [accessed 13 August 2026]
  2. Goldstein, I., et al. (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]
  3. Medicines and Healthcare products Regulatory Agency. (2021). Sildenafil: Summary of Product Characteristics. GOV.UK. https://www.gov.uk/government/organisations/medicines-and-healthcare-products-regulatory-agency [accessed 13 August 2026]
  4. 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]
  5. Yuan, J., et al. (2013). Comparative effectiveness and safety of oral phosphodiesterase type 5 inhibitors for erectile dysfunction: a systematic review and network meta-analysis. European Urology, 63(5), 902-912. https://doi.org/10.1016/j.eururo.2013.01.012 [accessed 13 August 2026]
  6. Medicines and Healthcare products Regulatory Agency. (2020). Falsified medicines and devices. GOV.UK. https://www.gov.uk/guidance/falsified-medicines-and-devices [accessed 13 August 2026]
  7. 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. Erectile dysfunction can sometimes indicate underlying health conditions that require medical evaluation.

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Faq

Is generic sildenafil as effective as Viagra?
Yes. Generic sildenafil contains the identical active ingredient at the same concentration as branded Viagra and is required by the MHRA to demonstrate bioequivalence, meaning it delivers the same therapeutic effects.
How much does sildenafil cost in the UK?
At Cured Pharmacy, sildenafil is available from £0.45 per tablet. Final cost depends on your prescribed dose and quantity, determined by a UK prescriber during your free online consultation.
Can I buy sildenafil without seeing a doctor?
Sildenafil requires a prescription in the UK. However, you can complete a free online consultation with a UK-registered prescriber at Cured Pharmacy, which takes under three minutes and doesn't require a video call or GP appointment.
How long does sildenafil take to work?
Sildenafil typically begins working within 30-60 minutes of administration, with peak effects occurring around 60 minutes after taking the tablet. Effects last approximately 4-6 hours, though this varies between individuals.
What's the difference between viagra and sildenafil UK pricing?
Branded Viagra costs significantly more than generic sildenafil despite containing identical active ingredients. Generic sildenafil offers the same efficacy at a fraction of the price because manufacturers don't bear original research and marketing costs.
Can I take sildenafil with alcohol?
Small amounts of alcohol are unlikely to affect sildenafil efficacy, but excessive alcohol consumption can impair erectile function and increase the risk of side effects such as dizziness and low blood pressure. Moderation is advised.
Does sildenafil work for everyone with erectile dysfunction?
Clinical trials show sildenafil improves erectile function in approximately 70-80% of men with ED. Effectiveness varies based on underlying causes, and some men may respond better to alternative PDE5 inhibitors like tadalafil.
How do I know if online sildenafil is genuine?
Only purchase from GPhC-registered UK pharmacies that require a clinical consultation and display verifiable registration credentials. Cured Pharmacy (GPhC 9012511) supplies only genuine UK-licensed sildenafil from approved pharmaceutical wholesalers.
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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