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What Will Viagra Do: Complete Dosage Explained

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What Will Viagra Do: Complete Dosage Explained

Published on: June 03, 2026

Understanding what will viagra do dosage uk options mean for your treatment is essential before starting erectile dysfunction therapy. Viagra (sildenafil citrate) is a phosphodiesterase type 5 (PDE5) inhibitor that helps men achieve and maintain erections sufficient for sexual activity, available in 25mg, 50mg, and 100mg doses [1]. At Cured Pharmacy, our UK-registered clinical team assesses your individual needs to recommend the appropriate starting dose, with genuine sildenafil available from £0.45 per tablet.

How Viagra Works in Your Body

Viagra works by blocking the enzyme phosphodiesterase type 5 (PDE5), which normally breaks down cyclic guanosine monophosphate (cGMP) in the smooth muscle cells lining blood vessels of the penis [1]. When PDE5 is inhibited, cGMP levels increase, allowing these smooth muscles to relax and blood vessels to dilate, facilitating increased blood flow during sexual stimulation.

It's crucial to understand that Viagra does not create spontaneous erections — sexual arousal is still required to trigger the natural release of nitric oxide, which initiates the cGMP pathway [2]. The medication simply enhances your body's natural response to sexual stimulation by preventing the premature breakdown of cGMP.

Clinical trials demonstrate that sildenafil reaches peak plasma concentration approximately 60 minutes after oral administration, though this can vary from 30 to 120 minutes depending on individual factors and whether it's taken with food [1]. The effects typically last for four to five hours, though this doesn't mean you'll have an erection for that entire duration — rather, you'll be able to respond to sexual stimulation more easily during this window.

Viagra Dosage Options: 25mg, 50mg, and 100mg Explained

The standard starting dose recommended by NICE guidelines for most men is 50mg, taken approximately one hour before anticipated sexual activity [3]. This middle-ground dose provides effective results for the majority of patients whilst minimising the risk of side effects. Your UK prescriber may adjust this based on your medical history, current medications, and individual response.

For men over 65, those with hepatic or renal impairment, or patients taking certain medications that affect sildenafil metabolism, a lower 25mg starting dose is typically recommended [3]. This conservative approach allows clinicians to assess tolerability before increasing the dose if needed.

The 100mg dose represents the maximum recommended daily dose and is reserved for patients who have tried 50mg without achieving adequate results and have tolerated the medication well [1]. It's important to note that exceeding 100mg does not improve efficacy and significantly increases the risk of adverse effects including headache, flushing, and visual disturbances.

Adjusting Your Dose Safely

Dose adjustments should always be made under the guidance of a UK prescriber after assessing your response over at least four to six attempts at the same dose [3]. Some men find that 25mg provides sufficient improvement, whilst others require titration to 100mg for optimal results. Never adjust your dose independently or take more than one tablet within a 24-hour period.

What to Expect: Viagra's Effects and Timeline

Most men notice Viagra begins working within 30 to 60 minutes of administration, though individual response times vary [1]. Taking the medication on an empty stomach typically results in faster absorption, whilst high-fat meals can delay onset by up to an hour. For optimal planning, take your dose approximately one hour before you anticipate sexual activity.

In clinical trials, approximately 82% of men with erectile dysfunction experienced improved erections sufficient for sexual intercourse when taking sildenafil 50mg or 100mg, compared to 25% in the placebo group [2]. These improvements included both the ability to achieve an erection and maintain it long enough to complete intercourse successfully.

The effects you experience will depend on the underlying cause of your erectile dysfunction, the dose prescribed, and individual physiological factors. Some men report feeling a slight facial flushing or warmth as the medication takes effect — this is normal and indicates the vasodilatory action is occurring throughout the body, not just in the genital area.

Duration of Action

Viagra remains active in your system for approximately four to five hours, with peak effectiveness occurring in the first two to three hours after administration [1]. This doesn't mean you'll maintain an erection for hours — rather, you'll find it easier to achieve erections in response to sexual stimulation during this window. After sexual activity concludes, the erection will subside naturally.

Treatment Active Ingredient Duration Starting Price
Sildenafil (generic) Sildenafil citrate 4-5 hours From £0.45
Viagra Connect Sildenafil citrate 4-5 hours From £11.49
Sildenafil Eropid Sildenafil citrate 4-5 hours From £8.99
Tadalafil (generic) Tadalafil Up to 36 hours From £9.99
Cialis (branded) Tadalafil Up to 36 hours From £53.00

Sildenafil vs Viagra: Understanding Your Options

Viagra is the branded version of sildenafil citrate, originally developed and marketed by Pfizer. Since the patent expired in 2013, generic sildenafil has become widely available in the UK at significantly lower prices whilst containing the identical active ingredient in the same doses [4]. At Cured Pharmacy, generic sildenafil starts from £0.45 per tablet, making it an affordable option for long-term treatment.

Both branded Viagra and generic sildenafil must meet the same stringent MHRA standards for quality, safety, and efficacy. The active pharmaceutical ingredient, manufacturing processes, and clinical effects are identical — the primary differences lie in packaging, marketing, and price. Some patients prefer the branded option for reassurance, whilst others choose generic sildenafil for cost-effectiveness.

We stock both Viagra Connect (the over-the-counter 50mg formulation) from £0.45 and prescription-strength generic sildenafil. Your UK prescriber will recommend the most appropriate option based on your medical assessment, preferences, and budget considerations.

Common Side Effects and How to Manage Them

The most frequently reported side effects of sildenafil include headache (occurring in approximately 16% of users), facial flushing (10%), and indigestion (7%) [2]. These effects are generally mild to moderate, dose-dependent, and tend to diminish with continued use as your body adjusts to the medication.

Visual disturbances, including a blue tinge to vision or increased light sensitivity, affect approximately 3% of users and result from mild PDE6 inhibition in the retina [1]. These effects are temporary and resolve as the medication clears your system. If you experience sudden vision loss or hearing impairment, discontinue use immediately and seek urgent medical attention.

To minimise side effects, start with the lowest effective dose, stay well-hydrated, and avoid excessive alcohol consumption when taking sildenafil. Headaches can often be managed with standard paracetamol, though you should discuss persistent or severe side effects with your prescriber, who may recommend dose adjustment or an alternative PDE5 inhibitor such as tadalafil.

When to Seek Medical Advice

Priapism — an erection lasting longer than four hours — is a rare but serious side effect requiring immediate medical attention to prevent permanent tissue damage [3]. Additionally, if you experience chest pain during sexual activity, stop immediately and seek emergency care, as this may indicate cardiovascular complications incompatible with PDE5 inhibitor use.

Getting Viagra Through Cured Pharmacy

All sildenafil and Viagra products at Cured Pharmacy require a clinical assessment by our UK-registered prescribers before dispensing. Our online consultation takes under three minutes and covers your medical history, current medications, and cardiovascular health to ensure sildenafil is safe and appropriate for you.

We offer transparent upfront pricing with no hidden consultation fees — you'll see the exact cost before completing your assessment. Once approved, your medication is dispensed by our GPhC-registered pharmacy (registration number 9012511) under the supervision of our superintendent pharmacist, Tarun Kumar (GPhC 2233073), and delivered in 100% discreet packaging.

Our clinical team can prescribe various sildenafil options including generic sildenafil from £0.45, branded Viagra Connect from £0.45, and Sildenafil Eropid from £0.45. For patients who find sildenafil unsuitable or prefer a longer-acting alternative, we also offer tadalafil-based treatments with effects lasting up to 36 hours. Start your free online consultation today to determine which erectile dysfunction treatment best suits your needs.

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. 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]
  3. National Institute for Health and Care Excellence. (2024). Erectile dysfunction: sildenafil. NICE British National Formulary. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 13 August 2026]
  4. Medicines and Healthcare products Regulatory Agency. (2013). Sildenafil: generic medicines authorisation. MHRA Public Assessment Report. https://www.gov.uk/government/organisations/medicines-and-healthcare-products-regulatory-agency [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

What will Viagra do if I don't have erectile dysfunction?
Viagra will not significantly enhance erections in men without erectile dysfunction, as the medication works by correcting impaired blood flow mechanisms rather than creating superhuman performance. Taking it without medical need exposes you to unnecessary side effects and is not recommended.
How long does it take for Viagra to work?
Viagra typically begins working within 30 to 60 minutes, with peak effects occurring around 60 minutes after administration. Taking it on an empty stomach may result in faster onset compared to after a heavy, high-fat meal.
Can I take Viagra every day?
Viagra is designed for on-demand use rather than daily administration, though it is safe to use daily if needed, provided you do not exceed one dose per 24-hour period. For daily treatment, your prescriber may recommend tadalafil instead, which is specifically licensed for daily low-dose use.
What is the best dosage of Viagra to start with?
The recommended starting dose for most men is 50mg, taken approximately one hour before sexual activity. Your UK prescriber may recommend 25mg if you're over 65, have liver or kidney impairment, or take certain medications that interact with sildenafil.
Does Viagra work the first time you take it?
Approximately 82% of men experience improved erections with their first dose of sildenafil 50mg or 100mg in clinical trials. However, some men require four to six attempts to achieve optimal results as they learn the best timing and conditions for their individual response.
Can I drink alcohol while taking Viagra?
Moderate alcohol consumption is generally safe with Viagra, though excessive drinking can impair erectile function and increase the risk of side effects such as dizziness and low blood pressure. Limiting intake to one or two units is advisable when using sildenafil.
What happens if Viagra doesn't work for me?
If 50mg sildenafil proves ineffective after at least four properly-timed attempts, your prescriber may increase the dose to 100mg or consider alternative treatments such as tadalafil, which has a different pharmacokinetic profile. Approximately 10-15% of men do not respond adequately to PDE5 inhibitors and may require alternative therapies.
Is generic sildenafil as effective as branded Viagra?
Yes, generic sildenafil contains the identical active ingredient in the same doses and meets the same MHRA quality standards as branded Viagra, providing equivalent clinical efficacy at a significantly lower cost. The only differences are in packaging and price, not therapeutic effect.
How much does Viagra cost at Cured Pharmacy?
Viagra costs vary depending on the dosage and quantity you order at Cured Pharmacy. Our UK-registered pharmacists provide transparent pricing with no hidden fees, and your free online consultation is included with every order to ensure you receive the most cost-effective treatment option.
Is Viagra available without a prescription in the UK?
No, Viagra is a prescription-only medication in the UK and cannot legally be purchased without one. Cured Pharmacy provides a free, confidential online consultation service where our qualified prescribers can issue a prescription if clinically appropriate, making the process simple and discreet.
How quickly can I get Viagra delivered in the UK?
Cured Pharmacy offers fast, discreet delivery across the UK, typically within 1-2 working days of prescription approval. All orders are dispatched in plain, unmarked packaging to protect your privacy, and we provide tracked delivery options so you can monitor your parcel throughout transit.
What is the difference between Viagra and generic sildenafil?
Viagra is the branded version containing sildenafil citrate, while generic sildenafil contains the exact same active ingredient at identical dosages. Both work the same way and are equally effective, but generic sildenafil is typically more affordable, and Cured Pharmacy offers both options following your free consultation.
Is Viagra safe to use long term?
Viagra is generally safe for long-term use when taken as prescribed and under medical supervision. Cured Pharmacy's qualified prescribers will assess your suitability during your free consultation and can provide ongoing support to monitor your treatment, ensuring it remains safe and effective for your individual needs.
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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