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Cheapest Viagra 100mg FAQ UK: Complete Usage and Dosage Guide for UK Patients

Searching for a comprehensive viagra 100mg faq uk resource? This guide answers the most common questions about Viagra 100mg, from dosage timing to side effects, all reviewed by our UK-registered clinical team at Cured Pharmacy. Whether you're considering Viagra for the first time or switching from a lower dose, understanding how this medication works can help you achieve the best results.

What Is Viagra 100mg and How Does It Work?

Viagra 100mg contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor licensed by the MHRA for treating erectile dysfunction in adult men [1]. Sildenafil works by relaxing blood vessels in the penis, allowing increased blood flow when sexually aroused. It's important to note that Viagra does not cause spontaneous erections — sexual stimulation is required for the medication to work effectively.

Searching for the cheapest viagra 100mg faq uk resource? This guide answers the most common questions about Viagra 100mg, from dosage timing to side effects, all reviewed by our UK-registered clinical team at Cured Pharmacy. Whether you're considering Viagra for the first time or switching from a lower dose, understanding how this medication works can help you achieve the best results.

How to Take Viagra 100mg Correctly

Take one Viagra 100mg tablet approximately 30 to 60 minutes before planned sexual activity. The medication can be taken with or without food, though high-fat meals may delay absorption and reduce effectiveness [2]. Swallow the tablet whole with water — do not crush, chew, or split the tablet unless specifically instructed by your prescriber.

Viagra remains active in your system for approximately 4 to 5 hours, though this varies between individuals. The peak effect typically occurs around 60 minutes after ingestion [2]. You should not take more than one dose in any 24-hour period, regardless of whether the first dose produced the desired effect.

Timing and Food Interactions

Whilst Viagra can be taken with food, fatty meals may delay the onset of action by up to 60 minutes. For optimal results, consider taking Viagra on an empty stomach or after a light meal. Grapefruit and grapefruit juice should be avoided, as they can interfere with how your body metabolises sildenafil, potentially increasing side effects [2].

Common Side Effects of Viagra 100mg

The most frequently reported side effects of Viagra 100mg include headache (affecting up to 16% of users), facial flushing, indigestion, nasal congestion, and visual disturbances such as mild colour tinge or increased light sensitivity [3]. These effects are generally mild to moderate and resolve within a few hours as the medication leaves your system.

All erectile dysfunction treatments at Cured Pharmacy require a free online consultation with a UK-registered prescriber before dispensing. Our clinical assessment takes under 3 minutes and covers your medical history, current medications, and cardiovascular health to ensure Viagra 100mg is safe and appropriate for you. If approved, your medication is dispensed by our GPhC-registered pharmacy (registration number 9012511) and delivered in 100% discreet packaging.

Managing Minor Side Effects

We offer transparent upfront pricing with no hidden fees — you'll see the exact cost before completing your consultation. For those seeking the cheapest viagra 100mg faq uk options, we stock generic sildenafil from £0.45, providing affordable access to the same clinically proven treatment. Our superintendent pharmacist, Tarun Kumar (GPhC 2233073), oversees all dispensing to ensure you receive genuine UK-licensed medicines. For patients seeking alternative erectile dysfunction treatments, we also offer tadalafil-based options with longer duration of action.

Treatment Active Ingredient Duration of Action Starting Price
Sildenafil Sildenafil citrate 4-5 hours From £0.45
Viagra Connect 50mg Sildenafil citrate 4-5 hours From £11.49
Tadalafil Tadalafil Up to 36 hours From £9.99
Cialis (Tadalafil) Tadalafil Up to 36 hours From £53.00

Viagra 100mg vs Sildenafil: Understanding the Difference

Viagra is the branded version of sildenafil manufactured by Pfizer, whilst generic sildenafil contains the identical active ingredient in the same doses. Both medications work in exactly the same way and have equivalent clinical efficacy — the primary difference is price. At Cured Pharmacy, generic sildenafil is available from £0.45 per tablet, offering significant savings compared to branded Viagra whilst delivering the same therapeutic effect.

Generic sildenafil became widely available in the UK after Pfizer's patent expired in 2013. All generic versions sold through UK-registered pharmacies must meet the same rigorous MHRA standards for quality, safety, and efficacy as the original branded product [4]. Whether you choose Viagra or sildenafil depends on personal preference and budget — both require the same clinical assessment and prescription from a UK prescriber.

Who Should Not Take Viagra 100mg?

Viagra 100mg is contraindicated in several patient groups. You must not take sildenafil if you use nitrate medications for chest pain (such as glyceryl trinitrate), as the combination can cause a dangerous drop in blood pressure [5]. Similarly, patients taking riociguat for pulmonary hypertension should avoid sildenafil due to serious drug interactions.

Men with severe cardiovascular disease, recent stroke or heart attack (within 6 months), uncontrolled high or low blood pressure, or severe liver impairment may not be suitable candidates for Viagra 100mg [5]. Patients with rare hereditary eye conditions such as retinitis pigmentosa should discuss alternative treatments with their prescriber. A thorough medical assessment by a UK prescriber will determine whether Viagra is safe and appropriate for your individual circumstances.

Drug Interactions to Consider

Certain medications can interact with Viagra, requiring dose adjustments or alternative treatments. Alpha-blockers used for prostate problems or high blood pressure may cause excessive blood pressure drops when combined with sildenafil. HIV protease inhibitors and some antifungal medications can increase sildenafil levels in your blood, necessitating lower doses [5]. Always disclose all medications and supplements during your clinical consultation.

Getting Viagra 100mg from Cured Pharmacy

All erectile dysfunction treatments at Cured Pharmacy require a free online consultation with a UK-registered prescriber before dispensing. Our clinical assessment takes under 3 minutes and covers your medical history, current medications, and cardiovascular health to ensure Viagra 100mg is safe and appropriate for you. If approved, your medication is dispensed by our GPhC-registered pharmacy (registration number 9012511) and delivered in 100% discreet packaging.

We offer transparent upfront pricing with no hidden fees — you'll see the exact cost before completing your consultation. Alongside branded Viagra, we stock generic sildenafil from £0.45, providing affordable access to the same clinically proven treatment. Our superintendent pharmacist, Tarun Kumar (GPhC 2233073), oversees all dispensing to ensure you receive genuine UK-licensed medicines. For patients seeking alternative erectile dysfunction treatments, we also offer tadalafil-based options with longer duration of action.

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 7 August 2026]
  2. Nichols, D. J., Muirhead, G. J., & Harness, J. A. (2002). Pharmacokinetics of sildenafil after single oral doses in healthy male subjects: absolute bioavailability, food effects and dose proportionality. British Journal of Clinical Pharmacology, 53(Suppl 1), 5S–12S. https://doi.org/10.1046/j.0306-5251.2001.00027.x [accessed 7 August 2026]
  3. Morales, A., Gingell, C., Collins, M., Wicker, P. A., & Osterloh, I. H. (1998). Clinical safety of oral sildenafil citrate (VIAGRA) in the treatment of erectile dysfunction. International Journal of Impotence Research, 10(2), 69–74. https://doi.org/10.1038/sj.ijir.3900316 [accessed 7 August 2026]
  4. Medicines and Healthcare products Regulatory Agency. (2020). Sildenafil: Product Information. GOV.UK. https://www.gov.uk/government/organisations/medicines-and-healthcare-products-regulatory-agency [accessed 7 August 2026]
  5. Kloner, R. A., & Zusman, R. M. (1999). Cardiovascular effects of sildenafil citrate and recommendations for its use. American Journal of Cardiology, 84(5), 11N–17N. https://doi.org/10.1016/S0002-9149(99)00455-4 [accessed 7 August 2026]
  6. NHS. (2026). Erectile dysfunction (impotence). https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ Accessed 7 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

Can I take Viagra 100mg every day?
Viagra 100mg is designed for on-demand use, not daily administration. You should not take more than one dose in any 24-hour period. If you require frequent dosing, speak to your prescriber about daily low-dose tadalafil as an alternative.
How long does Viagra 100mg last?
Viagra 100mg remains active for approximately 4 to 5 hours, with peak effects occurring around 60 minutes after ingestion. Individual response times vary based on metabolism, age, and other factors.
What happens if Viagra 100mg doesn't work for me?
If Viagra 100mg proves ineffective after several attempts, consult your prescriber. Alternative treatments include tadalafil (which has a longer duration of action) or adjusting timing and lifestyle factors that may affect erectile function.
Is Viagra 100mg safe with alcohol?
Small amounts of alcohol are unlikely to interfere with Viagra, but excessive drinking can impair erectile function and increase the risk of side effects such as dizziness and low blood pressure. Moderation is advisable.
Can I split a Viagra 100mg tablet in half?
Viagra tablets are not scored for splitting and doing so may result in uneven doses. If you require a 50mg dose, request the appropriate strength from your prescriber rather than splitting tablets.
Does Viagra 100mg increase size?
No. Viagra does not increase penis size — it facilitates erections by improving blood flow when sexually aroused. The medication treats erectile dysfunction but does not alter physical dimensions.
How much does Viagra 100mg cost in the UK?
Searching for the cheapest viagra 100mg faq uk pricing? Branded Viagra 100mg pricing varies across UK pharmacies. At Cured Pharmacy, generic sildenafil 100mg offers the same active ingredient from £0.45 per tablet, providing significant cost savings with equivalent clinical efficacy.
Do I need a prescription for Viagra 100mg?
Yes. Viagra 100mg is a prescription-only medication in the UK and requires clinical assessment by a UK-registered prescriber. Cured Pharmacy offers a free online consultation that takes under 3 minutes to complete — making it easy to find the cheapest viagra 100mg faq uk option safely.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 07 August 2026

Last updated on 07 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 07 August 2026

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

Current version (07 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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