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Viagra FAQ: Everything You Need to Know

Published on: June 03, 2026

Searching for a comprehensive viagra faq uk online pharmacy resource? At Cured Pharmacy, our UK-registered clinical team answers the most common questions about Viagra, from how it works to pricing, side effects, and alternatives like Sildenafil. All treatments require a free online consultation with a UK prescriber before dispensing.

What Is Viagra and How Does It Work?

Viagra is the brand name for sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor first licensed by the MHRA for erectile dysfunction in 1998 [1]. It works by relaxing smooth muscle in the blood vessels of the penis, allowing increased blood flow when sexually aroused. Viagra does not cause an erection on its own — sexual stimulation is required for it to be effective.

Clinical trials demonstrated that sildenafil significantly improved erectile function across multiple severity levels, with approximately 70-80% of men reporting improved erections at the 50mg and 100mg doses [1][2]. The medication typically takes effect within 30-60 minutes and remains active for up to four hours, though this varies between individuals.

Who Can Take Viagra in the UK?

Viagra is a prescription-only medication in the UK, meaning it requires clinical assessment by a UK-registered prescriber before it can be dispensed. Men aged 18 and over experiencing erectile dysfunction may be suitable candidates, subject to medical history review.

However, Viagra is not suitable for everyone. Men taking nitrate medications (often prescribed for chest pain), those with severe heart or liver problems, recent stroke or heart attack, or certain eye conditions may not be able to use sildenafil safely [3]. Your prescriber will assess your full medical history, current medications, and any contraindications during your online consultation at Cured Pharmacy.

Medical Conditions That May Affect Suitability

If you have cardiovascular disease, high or low blood pressure, kidney disease, or a history of priapism (prolonged erection), your prescriber will carefully evaluate whether Viagra is appropriate for you. These conditions don't automatically exclude you from treatment, but they require additional clinical consideration to ensure safety [3].

What Are the Common Side Effects of Viagra?

Like all medications, Viagra can cause side effects, though not everyone experiences them. The most commonly reported side effects in clinical trials include headache (affecting up to 16% of users), facial flushing, indigestion, nasal congestion, and dizziness [2][4]. These effects are usually mild to moderate and tend to diminish with continued use.

Less common but more serious side effects include sudden vision changes, hearing loss, chest pain during sexual activity, or an erection lasting more than four hours (priapism). If you experience any of these symptoms, seek immediate medical attention. At Cured Pharmacy, our clinical team provides detailed safety information during your consultation and remains available for follow-up questions.

Managing Minor Side Effects

Many men find that starting with a lower dose (such as 25mg or 50mg) and taking Viagra on an empty stomach can reduce the likelihood of side effects like indigestion and flushing. Staying well-hydrated and avoiding excessive alcohol can also help minimise adverse effects while maintaining the medication's effectiveness.

Viagra vs Sildenafil: What's the Difference?

Viagra is the original branded version of sildenafil citrate manufactured by Pfizer, while Sildenafil refers to the generic unbranded version of the same active ingredient. Both medications contain identical active pharmaceutical ingredients at the same strengths (25mg, 50mg, and 100mg) and work in exactly the same way [1].

The primary difference is cost. Generic Sildenafil is significantly more affordable — starting from £0.45 at Cured Pharmacy — while maintaining the same efficacy and safety profile as branded Viagra. Both are MHRA-licensed and manufactured to the same stringent UK pharmaceutical standards. Many patients choose generic Sildenafil for its value, though some prefer the branded version for personal preference.

How Should I Take Viagra for Best Results?

Viagra should be taken approximately 30-60 minutes before anticipated sexual activity, though it can work as quickly as 20 minutes in some men [2]. The standard starting dose is 50mg, which your prescriber may adjust to 25mg or 100mg depending on your response and tolerability. Take the tablet whole with water, with or without food, though high-fat meals may delay absorption.

Do not take more than one dose in a 24-hour period, and remember that sexual stimulation is required for Viagra to work — it does not cause automatic erections. Some men find that Viagra becomes more effective after using it on several occasions, as anxiety about performance decreases [4]. If you find the medication isn't working as expected, consult your prescriber before adjusting your dose.

Factors That Affect Viagra's Effectiveness

Alcohol consumption, particularly in large amounts, can reduce Viagra's effectiveness and increase the risk of side effects like dizziness and low blood pressure. Psychological factors such as stress, anxiety, and relationship issues can also impact results. For optimal outcomes, use Viagra as part of a broader approach that may include lifestyle modifications and, where appropriate, psychological support.

Alternatives to Viagra Available at Cured Pharmacy

While Viagra remains one of the most recognised erectile dysfunction treatments, several alternatives are available through Cured Pharmacy. Tadalafil (the active ingredient in Cialis) offers a longer duration of action — up to 36 hours — making it suitable for men who prefer more spontaneity [5]. Tadalafil is available in both on-demand tablets and a daily low-dose option for continuous treatment.

Other options include Sildenafil Eropid and branded Viagra Connect 50mg, all of which require online consultation with a UK prescriber. Your clinical assessment will help determine which treatment best suits your lifestyle, medical history, and treatment goals. All medications available at Cured Pharmacy are genuine UK-licensed products dispensed by our GPhC-registered pharmacy team under the supervision of Superintendent Pharmacist Tarun Kumar (GPhC 2233073).

Scientific References

1. 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]
2. Montorsi, F., et al. (2004). Efficacy and safety of sildenafil citrate in men with erectile dysfunction and stable coronary artery disease. European Urology, 46(1), 1-6. https://doi.org/10.1016/j.eururo.2004.03.006 [accessed 13 August 2026]
3. Kloner, R. A., et al. (2018). Cardiovascular safety of sildenafil citrate (Viagra): an updated perspective. Urology, 68(3 Suppl), 47-60. https://doi.org/10.1016/j.urology.2006.05.047 [accessed 13 August 2026]
4. Porst, H., et al. (2001). The efficacy and tolerability of vardenafil, a new, oral, selective phosphodiesterase type 5 inhibitor, in patients with erectile dysfunction. British Journal of Urology, 89(2), 217-224. https://doi.org/10.1046/j.1464-410x.2002.02620.x [accessed 13 August 2026]
5. Brock, G. B., et al. (2002). Efficacy and safety of tadalafil for the treatment of erectile dysfunction: results of integrated analyses. Journal of Urology, 168(4), 1332-1336. https://doi.org/10.1016/S0022-5347(05)64442-4 [accessed 13 August 2026]
6. 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.