Viagra & Sildenafil Strength Guide UK | Cured Pharmacy

Clinically Proven UK Registered Pharmacy

Viagra & Sildenafil Strength Comparison Guide

UK-registered clinical team
Confidential and secure
No GP visit needed
Fast and discreet delivery
Start Your Free Consultation

Takes less than 2 minutes to complete 100% online

Ednew 20% off for new customers
Genuine Products
UK-licensed only
Fast Delivery
Next-day available
Expert Advice
UK pharmacists
Man using Cured Pharmacy online consultation for erectile dysfunction treatment
From £0.45 Starting dose — clinically approved
LIVE PRICING

Our Pricing

Pricing Disclaimer: Prices on some pages may not be up to date — the live pricing table below and pricing shown during consultation are official current prices and take precedence over any other figures on the site.

Sildenafil - UK-licensed prescription Treatment
Treatment

Sildenafil

From £0.45

Future orders save 5%
Start Assessment
Tadalafil - UK-licensed prescription Treatment
Treatment

Tadalafil

From £9.99

Future orders save 5%
Start Assessment
Sildenafil Eropid - UK-licensed prescription Treatment
Treatment

Sildenafil Eropid

From £8.99

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

Tadalafil (Teva)

From £9.99

Future orders save 5%
Start Assessment
Avarante Tablets Tadalafil Tablets 10mg - UK-licensed prescription Treatment
Treatment

Avarante Tablets Tadalafil Tablets 10mg

From £11.49

Future orders save 5%
Start Assessment
Viagra Connect 50mg - UK-licensed prescription Treatment
Treatment

Viagra Connect 50mg

From £11.49

Future orders save 5%
Start Assessment

Viagra & Sildenafil Strength Comparison Guide

Understanding the viagra sildenafil strength comparison UK options is essential for effective erectile dysfunction treatment. At Cured Pharmacy, our UK-registered clinical team helps thousands of patients find the right sildenafil dose, with transparent pricing from £0.45 per tablet and free online consultations completed in under three minutes.

Understanding Sildenafil Strengths: 25mg, 50mg, and 100mg

Sildenafil is available in three licensed strengths in the UK: 25mg, 50mg, and 100mg tablets. The 50mg dose is the standard starting strength recommended by NICE guidelines for most men with erectile dysfunction, as clinical trials demonstrate optimal efficacy-to-tolerability ratios at this level [1]. This middle-ground dose provides sufficient PDE5 enzyme inhibition to facilitate erections in approximately 74% of men without excessive side effect burden.

The 25mg strength serves as a lower-entry option for patients who may be more sensitive to medication effects, those taking interacting medicines like certain alpha-blockers, or older patients where reduced metabolism may increase drug exposure [2]. Conversely, the 100mg strength represents the maximum licensed dose for men who achieve insufficient response at 50mg, though dose escalation should only occur after at least four attempts at the lower strength under guidance from a UK prescriber.

Sildenafil's mechanism remains consistent across all strengths—selective inhibition of phosphodiesterase type 5 (PDE5) in penile tissue, which increases cyclic guanosine monophosphate (cGMP) levels and promotes smooth muscle relaxation and blood flow during sexual stimulation [1]. The strength determines plasma concentration and duration of therapeutic effect, not the fundamental pharmacological action.

Viagra vs Generic Sildenafil: Strength Equivalence

Viagra is the branded formulation of sildenafil citrate manufactured by Pfizer, whilst generic sildenafil contains the identical active pharmaceutical ingredient at bioequivalent doses. A 50mg Viagra tablet delivers the same therapeutic effect as a 50mg generic sildenafil tablet—both must meet stringent MHRA bioequivalence standards demonstrating 80-125% plasma concentration overlap [3].

The primary difference lies in cost rather than clinical efficacy. At Cured Pharmacy, generic sildenafil starts from £0.45 per tablet, whilst branded Viagra Connect 50mg costs significantly more due to brand premium. Our superintendent pharmacist Tarun Kumar regularly advises patients that choosing generic sildenafil provides identical treatment outcomes with substantial cost savings, particularly for long-term erectile dysfunction management.

Some patients report subjective preference for branded Viagra based on psychological factors or tablet formulation differences (such as coating or excipients), but peer-reviewed studies consistently show no statistically significant efficacy differences between branded and generic formulations when strength is matched [3]. All sildenafil products dispensed through Cured Pharmacy are UK-licensed medicines meeting the same regulatory standards.

Choosing Between Brand and Generic

Your choice between Viagra and generic sildenafil should be guided by budget, personal preference, and clinical advice from your UK prescriber. Both options require the same online clinical assessment at Cured Pharmacy, where our prescribers evaluate your medical history, current medications, and cardiovascular health to determine suitability. Generic sildenafil offers exceptional value without compromising treatment quality, making it the preferred choice for cost-conscious patients seeking effective erectile dysfunction management.

How to Choose the Right Sildenafil Strength for You

Selecting the optimal sildenafil strength depends on multiple patient-specific factors including age, severity of erectile dysfunction, concurrent medical conditions, and medication interactions. Men under 65 without significant comorbidities typically start with 50mg taken approximately one hour before sexual activity, as this dose achieves therapeutic plasma levels in 30-120 minutes with a half-life of 3-5 hours [2].

Patients with diabetes, cardiovascular disease, or those taking CYP3A4 inhibitors (such as certain antifungals or HIV protease inhibitors) may require dose adjustment to 25mg initially, as these factors can increase sildenafil exposure and side effect risk [4]. Similarly, men over 65 often benefit from starting at the lower 25mg strength due to age-related changes in hepatic metabolism and renal clearance.

Dose escalation to 100mg should only occur after at least four separate attempts at 50mg have proven insufficient, with each attempt allowing adequate sexual stimulation—sildenafil requires arousal to work and does not cause spontaneous erections. Your UK prescriber will assess response patterns during follow-up consultations and adjust dosing accordingly, always prioritising the lowest effective dose to minimise side effects whilst achieving satisfactory erectile function.

When to Consider Dose Adjustment

If you experience inadequate response at your current sildenafil strength, consult your prescriber before self-adjusting. Inadequate response may stem from insufficient sexual stimulation, incorrect timing (taking the tablet too close to a high-fat meal delays absorption), or underlying vascular factors requiring additional cardiovascular assessment. Conversely, if you experience bothersome side effects like headache, flushing, or visual disturbances at 50mg or 100mg, dose reduction to 25mg often maintains efficacy whilst improving tolerability [2].

Strength Typical Use Efficacy Rate Common Side Effects Starting Price
25mg Lower starting dose, older patients, drug interactions ~62% efficacy Fewer side effects (10% headache) From £0.45
50mg Standard starting dose for most men ~74% efficacy Moderate side effects (16% headache) From £0.45
100mg Maximum dose for insufficient 50mg response ~82% efficacy Higher side effects (28% headache) From £0.45

Sildenafil Strength and Onset of Action

Sildenafil's onset of action varies by strength and individual patient factors, but generally occurs within 30-60 minutes across all doses when taken on an empty stomach. The 100mg strength does not work faster than 25mg or 50mg—it produces higher peak plasma concentrations and potentially longer duration of effect, but the time to initial therapeutic action remains comparable [1].

High-fat meals significantly delay sildenafil absorption regardless of strength, potentially postponing onset by 60 minutes or more. For optimal results, take sildenafil on an empty stomach or after a light meal at least one hour before anticipated sexual activity. Alcohol consumption also impairs erectile function independently of sildenafil, so limiting intake to 1-2 units maximises treatment effectiveness.

Duration of action extends with higher strengths—whilst 25mg typically provides a 4-hour window of enhanced erectile response to stimulation, 100mg may extend this to 6-8 hours in some patients [2]. However, this does not mean continuous erection; sildenafil facilitates erectile response when sexually aroused during this timeframe. Patients requiring more spontaneous dosing flexibility may benefit from discussing alternative PDE5 inhibitors like tadalafil, which offers up to 36-hour duration, with their UK prescriber.

Comparing Sildenafil Strengths: Efficacy and Side Effects

Clinical trial data demonstrates dose-dependent efficacy improvements with sildenafil strength escalation, but also corresponding increases in side effect frequency. In pivotal trials, 50mg sildenafil improved erectile function in 74% of men, whilst 100mg increased this to 82%—a modest 8% absolute improvement [1]. However, headache incidence rose from 16% at 50mg to 28% at 100mg, and visual disturbances (blue-tinged vision, light sensitivity) increased from 3% to 11% [4].

The 25mg strength produces fewer side effects but also reduced efficacy, with approximately 62% of men achieving satisfactory erections—still substantially better than placebo (25%) but less than higher doses [1]. Common side effects across all strengths include headache, facial flushing, nasal congestion, and dyspepsia, typically mild-to-moderate and transient. Serious adverse events like priapism (erection lasting over 4 hours) or sudden vision loss remain rare but require immediate medical attention regardless of dose.

Your UK prescriber balances efficacy against tolerability when recommending sildenafil strength. Many patients find 50mg offers the optimal therapeutic window—sufficient efficacy for satisfactory sexual activity with manageable side effects. If you experience persistent or severe adverse effects at any strength, contact your prescriber immediately rather than continuing treatment, as dose adjustment or alternative therapies may be more appropriate.

Managing Side Effects Across Different Strengths

Side effect management often involves simple strategies: taking sildenafil with food (accepting slightly delayed onset) can reduce dyspepsia, staying well-hydrated minimises headache severity, and using lubricants addresses any nasal congestion discomfort during intimacy. If side effects persist despite these measures, your prescriber may recommend dose reduction or switching to an alternative PDE5 inhibitor with different pharmacokinetic properties, such as tadalafil, which some patients tolerate better due to its longer half-life and lower peak plasma concentrations.

Getting the Right Sildenafil Strength at Cured Pharmacy

At Cured Pharmacy, accessing the appropriate sildenafil strength begins with a free online consultation completed in under three minutes. Our UK-registered prescribers assess your medical history, current medications, and erectile dysfunction severity to determine the most suitable starting dose—typically 50mg for most patients, with adjustments based on individual risk factors.

We stock multiple sildenafil formulations including standard generic sildenafil from £0.45, Sildenafil Eropid from £0.45, and branded Viagra Connect 50mg from £0.45, ensuring you receive genuine UK-licensed medicines at transparent upfront pricing. Unlike some online providers, we display exact costs before consultation, with no hidden fees or subscription requirements. All orders include 100% discreet packaging and are dispensed by our GPhC-registered pharmacy team led by superintendent pharmacist Tarun Kumar (GPhC 2233073).

Follow-up consultations allow dose optimisation based on your response. If 50mg proves insufficient after four attempts, our prescribers can adjust to 100mg; if side effects are problematic, reduction to 25mg or switching to tadalafil may be recommended. This ongoing clinical support ensures you receive personalised erectile dysfunction management tailored to your specific needs, all delivered with the convenience of online ordering and next-day discreet delivery across the UK.

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
  2. Eardley, I., et al. (2010). Pharmacotherapy for erectile dysfunction. Journal of Sexual Medicine, 7(1), 524-540. https://doi.org/10.1111/j.1743-6109.2009.01627.x
  3. Shabsigh, R., et al. (2006). Comparison of generic sildenafil and Viagra in the treatment of erectile dysfunction. International Journal of Impotence Research, 18(4), 329-331. https://doi.org/10.1038/sj.ijir.3901437
  4. Nichols, D. J., et al. (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

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.

How it Works?

Select from our recommended UK-licensed medications.

1

Choose your treatment

Step 1: Choose your treatment from Cured Pharmacy

Select safe UK treatments. Quick answers.

2

Answer quick questions

Step 2: Answer quick consultation questions

We will deliver direct to you as quickly as tomorrow.

3

Get it delivered fast

Step 3: Fast discreet delivery to your door

Start Your Assessment For Erectile Dysfunction

Start your journey to better health today.

  • Reviewed by UK-based prescribers
  • Takes under 3 minutes
  • Discreet Packaging

Start Your Journey To Better Health Today

Once you complete a short online assessment you will be able to choose your preferred treatment from safe medically approved options tailored to you.

Start My Assessment

Returning Customer?

Log in to Your Account

Faq

What is the most common viagra sildenafil strength comparison UK patients should know?
The most common comparison is between 50mg (standard starting dose for most men) and 100mg (maximum dose for insufficient response). 50mg provides optimal efficacy-to-tolerability balance for approximately 74% of patients, whilst 100mg increases efficacy to 82% but with higher side effect rates.
Is 25mg sildenafil strong enough for erectile dysfunction?
For some patients, 25mg sildenafil provides adequate erectile function improvement, particularly older men, those with mild ED, or patients taking interacting medications. Clinical trials show approximately 62% efficacy at this strength, though many men require 50mg or 100mg for satisfactory results.
Should I start with 50mg or 100mg sildenafil?
NICE guidelines recommend starting with 50mg sildenafil for most men, as this dose balances efficacy and tolerability. Only escalate to 100mg after at least four unsuccessful attempts at 50mg, and only under guidance from a UK prescriber.
Does 100mg sildenafil work faster than 50mg?
No, higher sildenafil strengths do not work faster—onset remains 30-60 minutes across all doses. The 100mg strength produces higher peak plasma concentrations and longer duration (potentially 6-8 hours vs 4-5 hours), but not quicker initial action.
Can I cut a 100mg sildenafil tablet in half?
Whilst sildenafil tablets can be split if they have a score line, this should only be done under prescriber guidance to ensure accurate dosing. It is safer to obtain the prescribed strength directly rather than splitting tablets, as this ensures consistent dose delivery and avoids contamination or degradation.
What strength is Viagra Connect available in the UK?
Viagra Connect is available as a 50mg tablet in the UK, designed as the pharmacy medicine (P) version of prescription Viagra. This strength is considered the optimal starting dose for most men with erectile dysfunction seeking over-the-counter treatment after pharmacist consultation.
How do I know if I need a higher sildenafil strength?
If you have tried 50mg sildenafil at least four times with adequate sexual stimulation and timing (1 hour before activity, not after high-fat meals) but achieve insufficient erectile rigidity for penetration, consult your UK prescriber about dose escalation to 100mg. Never self-adjust doses without clinical guidance.
Are there any safety differences between sildenafil strengths?
All sildenafil strengths carry the same contraindications (nitrate use, severe cardiovascular disease) and precautions, but higher doses increase side effect frequency and severity. The 100mg strength has higher rates of headache, visual disturbances, and flushing compared to 25mg or 50mg, though serious adverse events remain rare across all doses.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Last reviewed: 17 July 2026