Our Pricing

What Will Viagra Do? Understanding the Benefits

Published on: June 03, 2026

Understanding what will viagra do for erectile dysfunction is essential before starting treatment. Viagra (sildenafil citrate) works by increasing blood flow to the penis, enabling men to achieve and maintain an erection sufficient for sexual activity when sexually aroused [1]. At Cured Pharmacy, our UK-registered clinical team provides free consultations and genuine licensed treatments with transparent pricing from £0.45.

How Does Viagra Work in Your Body?

Viagra contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor that works by blocking the enzyme responsible for breaking down cyclic guanosine monophosphate (cGMP) in the smooth muscle cells lining blood vessels [1]. When sexual stimulation occurs, nitric oxide is released in the penis, triggering cGMP production which relaxes smooth muscle and allows increased blood flow into the erectile tissue.

By inhibiting PDE5, sildenafil allows cGMP levels to remain elevated for longer periods, sustaining the relaxation of smooth muscle and maintaining the increased blood flow necessary for an erection [2]. This mechanism only works in the presence of sexual stimulation — Viagra does not cause spontaneous erections and requires natural arousal to be effective.

Clinical studies demonstrate that sildenafil typically begins working within 30 to 60 minutes of oral administration, with peak plasma concentrations reached approximately one hour after dosing [1]. The effects can last for up to four to five hours, though this varies between individuals based on factors including age, metabolism, and concurrent medications.

What Will Viagra Do: Proven Clinical Benefits

In landmark clinical trials involving over 3,000 men with erectile dysfunction, sildenafil demonstrated significant improvements in erectile function across multiple measures [3]. Men taking sildenafil reported successful intercourse attempts in 76% of cases, compared to 22% in the placebo group — a clinically meaningful difference that has been replicated across diverse patient populations.

The benefits extend beyond physical function. Research published in the International Journal of Impotence Research found that men using sildenafil reported substantial improvements in confidence, relationship satisfaction, and overall quality of life [4]. These psychological benefits often prove as important as the physiological improvements, particularly for men who have experienced erectile dysfunction for extended periods.

Viagra has proven effective across various causes of erectile dysfunction, including diabetes-related ED, post-prostatectomy dysfunction, and psychogenic erectile difficulties [3]. Clinical data shows response rates of 50-60% even in challenging patient groups, making it a first-line treatment recommended by NICE guidelines for erectile dysfunction management.

Success Rates Across Different Patient Groups

Clinical trials demonstrate that sildenafil effectiveness varies by underlying cause. Men with psychogenic erectile dysfunction show response rates of approximately 84%, while those with diabetes-related ED achieve successful outcomes in 56-68% of cases [3]. Understanding these variations helps set realistic expectations and guides treatment decisions alongside your UK prescriber.

Sildenafil vs Viagra: Understanding Your Options

Viagra is the branded version of sildenafil citrate, originally developed by Pfizer and licensed by the MHRA in 1998. Generic sildenafil contains the identical active ingredient at the same doses and works through the same mechanism, but is available at significantly lower cost following patent expiry in 2013.

Both branded Viagra and generic sildenafil undergo rigorous quality control and must meet identical pharmaceutical standards set by the MHRA for bioequivalence, purity, and stability [5]. The clinical effectiveness is identical — generic sildenafil produces the same blood plasma concentrations, duration of action, and success rates as branded Viagra.

At Cured Pharmacy, we offer both options with complete transparency. Generic sildenafil starts from £0.45 per tablet, whilst branded Viagra Connect is available from £0.45. Your UK prescriber will discuss which option best suits your clinical needs and budget during your free consultation, with no pressure towards either choice.

Choosing Between Generic and Branded Options

The decision between generic sildenafil and branded Viagra is primarily financial rather than clinical. Some men prefer the reassurance of the original branded product, whilst others prioritise cost-effectiveness without compromising quality. Both options require the same clinical assessment and are dispensed to identical safety standards by our UK-registered pharmacy team.

What to Expect When Taking Viagra

Viagra should be taken approximately one hour before planned sexual activity, though it can work as quickly as 30 minutes in some men [1]. Taking it on an empty stomach may speed absorption, whilst high-fat meals can delay onset by up to one hour. The medication does not cause automatic erections — sexual stimulation is required to trigger the natural arousal pathway that sildenafil enhances.

Most men start with a 50mg dose, which can be adjusted to 25mg or 100mg based on effectiveness and tolerability [2]. Your UK prescriber will determine the appropriate starting dose during your clinical assessment, considering factors including age, other medications, and any underlying health conditions that might influence dosing decisions.

Common side effects include headache (16% of users), facial flushing (10%), and indigestion (7%) [3]. These effects are typically mild and transient, resolving within a few hours. Serious side effects are rare but include sudden vision changes or prolonged erections lasting over four hours, which require immediate medical attention.

Tadalafil as an Alternative: Comparing Your Treatment Options

Tadalafil (marketed as Cialis) is another PDE5 inhibitor that works through the same mechanism as sildenafil but offers a significantly longer duration of action — up to 36 hours compared to sildenafil's 4-5 hours [6]. This extended window allows for greater spontaneity, as sexual activity need not be timed as precisely around medication administration.

Clinical head-to-head trials show comparable effectiveness between sildenafil and tadalafil, with similar success rates across patient populations [6]. The choice often comes down to lifestyle preferences: men who prefer planned sexual activity may favour sildenafil's shorter action, whilst those seeking weekend-long effectiveness often choose tadalafil.

Tadalafil is also available in a daily low-dose formulation (2.5mg or 5mg), which maintains constant therapeutic levels and eliminates the need to plan around tablet-taking [6]. This option suits men who engage in sexual activity more than twice weekly and prefer not to anticipate timing. Your UK prescriber can discuss whether sildenafil, on-demand tadalafil, or daily tadalafil best matches your needs.

Daily vs On-Demand Treatment Approaches

On-demand treatments like standard-dose sildenafil and tadalafil are taken before anticipated sexual activity, whilst daily tadalafil provides continuous coverage. Daily dosing may improve treatment satisfaction for men in stable relationships with frequent sexual activity, whilst on-demand options suit those with less predictable patterns or who prefer taking medication only when needed.

Getting Started with Erectile Dysfunction Treatment at Cured Pharmacy

Starting treatment begins with a free online consultation that takes under three minutes to complete. Our UK-registered prescribers review your medical history, current medications, and cardiovascular health to ensure sildenafil or alternative treatments are safe and appropriate for you. This clinical assessment is mandatory for all prescription erectile dysfunction medications under MHRA regulations.

If approved, your prescription is dispensed by our GPhC-registered pharmacy (registration 9012511) under the supervision of superintendent pharmacist Tarun Kumar (GPhC 2233073). We use 100% discreet packaging with no external markings indicating contents, and offer next-day delivery across the UK for orders placed before our daily cut-off time.

Our transparent pricing shows exact costs before you complete your consultation — no hidden fees or surprise charges at checkout. Generic sildenafil starts from £0.45 per tablet, with various pack sizes available to suit different usage patterns. If you have questions at any stage, our UK-based pharmacy team is available on (+44) 116 4646009 during business hours.

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. Eardley, I., Ellis, P., Boolell, M., & Wulff, M. (2002). Efficacy and safety of sildenafil citrate in the treatment of men with mild to moderate erectile dysfunction. British Journal of Psychiatry, 181(S5), s46-s50. https://doi.org/10.1192/bjp.181.5.s46 [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. Althof, S. E. (2002). Quality of life and erectile dysfunction. Urology, 59(6), 803-810. https://doi.org/10.1016/S0090-4295(02)01606-0 [accessed 13 August 2026]
5. Medicines and Healthcare products Regulatory Agency. (2020). Guidance on the licensing of generic medicines. GOV.UK. https://www.gov.uk/guidance/generic-medicines-licensing [accessed 13 August 2026]
6. Porst, H., Giuliano, F., Glina, S., Ralph, D., Casabé, A. R., Elion-Mboussa, A., & Sorsaburu, S. (2006). Evaluation of the efficacy and safety of once-a-day dosing of tadalafil 5mg and 10mg in the treatment of erectile dysfunction: results of a multicenter, randomized, double-blind, placebo-controlled trial. European Urology, 50(2), 351-359. https://doi.org/10.1016/j.eururo.2006.02.052 [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.