Viagra vs Cialis UK - Compare Prices & Cheapest Option

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Viagra vs Cialis UK - Compare Prices & Cheapest Option

Compare viagra vs cialis at the cheapest UK price from £9.19 with 20% off using code Ednew.

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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
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Sildenafil

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Tadalafil - UK-licensed prescription Treatment
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Tadalafil

From £9.99

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Sildenafil Eropid - UK-licensed prescription Treatment
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Sildenafil Eropid

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Tadalafil (Teva) - UK-licensed prescription Treatment
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Tadalafil (Teva)

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Avarante Tablets Tadalafil Tablets 10mg - UK-licensed prescription Treatment
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Avarante Tablets Tadalafil Tablets 10mg

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Viagra Connect 50mg - UK-licensed prescription Treatment
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Viagra Connect 50mg

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Viagra vs Cialis: Clinical Comparison & UK Treatment Guide

When choosing between viagra vs cialis for erectile dysfunction, understanding the clinical differences is essential for selecting the right treatment. Both medications are phosphodiesterase type 5 (PDE5) inhibitors proven effective in clinical trials, but they differ significantly in onset time, duration of action, and dosing flexibility. This guide compares their mechanisms, efficacy data, side effect profiles, and UK pricing to help you make an informed decision with your prescriber.

How Viagra vs Cialis Work: Mechanism of Action

Both viagra vs cialis function as PDE5 inhibitors, blocking the enzyme phosphodiesterase type 5 to increase cyclic guanosine monophosphate (cGMP) levels in penile smooth muscle tissue. This biochemical cascade promotes vasodilation and improved blood flow to the corpus cavernosum during sexual stimulation [1]. Viagra contains sildenafil citrate, while Cialis contains tadalafil, and though their mechanisms are identical, their pharmacokinetic profiles differ substantially.

Sildenafil (Viagra) reaches peak plasma concentration in approximately 60 minutes and has a half-life of 3-5 hours, providing an effective window of around 4-6 hours [2]. Tadalafil (Cialis) achieves peak levels within 2 hours but has a significantly longer half-life of 17.5 hours, offering effectiveness for up to 36 hours—earning its 'weekend pill' nickname [2]. This extended duration allows for greater spontaneity without timing intercourse as precisely around medication intake.

Viagra vs Cialis Effectiveness: Clinical Trial Data

Clinical trials demonstrate comparable efficacy rates for viagra vs cialis, with both medications showing significant improvement over placebo. Sildenafil trials report successful intercourse rates of 57-84% depending on dose (25-100mg), compared to 25-30% with placebo [3]. Tadalafil studies show similar success rates of 61-81% across doses (5-20mg), with the 20mg dose achieving the highest response [3].

A head-to-head comparison published in the European Urology journal found no statistically significant difference in overall efficacy between the two medications when comparing equivalent therapeutic doses [4]. Patient preference studies, however, show tadalafil is often favoured for its longer duration, while sildenafil is preferred by those wanting a shorter action window or taking the medication less frequently. Response rates vary individually, and approximately 30-40% of men who don't respond adequately to one PDE5 inhibitor may respond better to another [4].

Onset Time and Duration Comparison

The onset and duration differences between viagra vs cialis are clinically significant for treatment planning. Sildenafil typically begins working within 30-60 minutes, with optimal timing being 1 hour before sexual activity on an empty stomach (high-fat meals can delay absorption by up to 60 minutes) [1]. Tadalafil can be taken 30 minutes to 12 hours before intercourse, with effectiveness maintained for up to 36 hours, offering greater flexibility in timing [2]. For men seeking daily dosing to allow complete spontaneity, tadalafil is available in low-dose daily formulations (2.5mg or 5mg), whereas sildenafil is taken only as needed.

Side Effects: Viagra vs Cialis Safety Profiles

The side effect profiles of viagra vs cialis are similar due to their shared mechanism, though minor differences exist in frequency and type. Common side effects for both include headache (11-16%), flushing (10-13%), nasal congestion (4-10%), and dyspepsia (4-12%) [5]. These are generally mild to moderate and transient, resolving without intervention.

Sildenafil is more commonly associated with visual disturbances (blue-tinged vision or increased light sensitivity) affecting approximately 3-11% of users, due to mild PDE6 inhibition in retinal photoreceptors [5]. Tadalafil has lower rates of visual side effects (<1%) but slightly higher incidence of back pain and myalgia (muscle aches) affecting 6-12% of users, thought to result from PDE11 inhibition in skeletal muscle [5]. Both medications are contraindicated with nitrate medications due to risk of severe hypotension, and both require caution in men with cardiovascular conditions—prescriber assessment is mandatory.

Drug Interactions and Contraindications

When comparing viagra vs cialis for safety, both share critical contraindications including concurrent nitrate use (GTN spray, isosorbide mononitrate), severe hepatic impairment, recent stroke or myocardial infarction (within 6 months), and hypotension (BP <90/50 mmHg) [1]. Alpha-blocker medications used for benign prostatic hyperplasia can cause additive hypotensive effects with both PDE5 inhibitors, requiring dose adjustments and careful initiation. Tadalafil is also licensed for daily use in treating lower urinary tract symptoms alongside erectile dysfunction, offering dual benefit for appropriate patients subject to prescriber approval.

Feature Viagra (Sildenafil) Cialis (Tadalafil)
Active Ingredient Sildenafil citrate Tadalafil
Onset of Action 30-60 minutes 30 minutes - 2 hours
Duration of Effect 4-6 hours Up to 36 hours
Dosing Options 25mg, 50mg, 100mg (as needed) 2.5mg, 5mg daily or 10mg, 20mg as needed
Food Interaction High-fat meals delay absorption Minimal food interaction
Common Side Effects Headache, flushing, visual disturbances Headache, flushing, back pain, myalgia
Starting Price (Generic) From £0.45 (Sildenafil) From £9.99 (Tadalafil)
Branded Price From £11.49 (Viagra Connect) From £53.00 (Cialis)
Best For Infrequent use, cost-conscious, shorter window Frequent use, spontaneity, longer window

Dosing Options: Viagra vs Cialis Flexibility

Dosing strategies differ between viagra vs cialis, affecting treatment personalisation. Sildenafil is available in 25mg, 50mg, and 100mg tablets, taken as needed approximately 1 hour before sexual activity, with a maximum frequency of once daily [2]. The recommended starting dose is typically 50mg, adjusted based on efficacy and tolerability. Viagra Connect (sildenafil 50mg) is available over-the-counter in the UK for men aged 18 and over without prescription, though clinical assessment is still recommended.

Tadalafil offers both on-demand dosing (10mg or 20mg taken before anticipated sexual activity) and daily dosing (2.5mg or 5mg taken at the same time each day regardless of sexual activity timing) [2]. Daily tadalafil provides continuous readiness and is particularly suited to men having intercourse more than twice weekly or those preferring complete spontaneity. The on-demand 10mg dose is the typical starting point, adjustable to 20mg or down to 5mg based on response. This flexibility makes tadalafil advantageous for tailored treatment approaches.

Cost Comparison: Viagra vs Cialis UK Pricing

Price is a significant consideration when choosing between viagra vs cialis in the UK. At Cured Pharmacy, generic sildenafil starts from £9.19 per tablet, offering the most cost-effective option for on-demand treatment. Generic tadalafil is priced from £9.19, while branded Viagra Connect 50mg starts at £9.19 for convenient over-the-counter access.

Branded Cialis (tadalafil) is available from £9.19, reflecting the premium for the original formulation. Generic versions (often labeled as tadalafil from manufacturers like Teva or Avarante) provide identical active ingredients at substantially lower cost—Avarante Tadalafil 10mg tablets start from £9.19. For men taking treatment regularly, generic sildenafil offers the greatest value, while those prioritising the extended 36-hour window may find generic tadalafil the optimal balance of clinical benefit and affordability. All prices shown are before applying the 20% first-order discount with code Ednew, and all prescription treatments require online clinical assessment by our UK-registered prescribers.

Cheapest UK Prices at Cured Pharmacy

Cured Pharmacy guarantees the cheapest UK prices on both viagra vs cialis options, with transparent upfront pricing shown before consultation. Our superintendent pharmacist Tarun Kumar (GPhC 2233073) leads a UK-registered clinical team providing free online assessments completed in under 3 minutes. All medications are genuine, UK-licensed products dispensed from our GPhC-registered pharmacy (9012511), with discreet next-day delivery available. New customers save 20% off their first order using code Ednew, making effective erectile dysfunction treatment accessible and affordable.

Choosing Between Viagra vs Cialis: Clinical Guidance

Selecting between viagra vs cialis depends on individual lifestyle, frequency of sexual activity, and personal preference rather than superiority of one over the other. Sildenafil is ideal for men who have intercourse less frequently (once or twice weekly), prefer a shorter duration of action, want the lowest cost option, or are trying PDE5 inhibitor therapy for the first time due to extensive clinical familiarity and over-the-counter availability [4].

Tadalafil is better suited for men having intercourse more than twice weekly (daily dosing option), those valuing spontaneity and a 36-hour effectiveness window, couples preferring not to time intimacy around medication, or men with coexisting lower urinary tract symptoms where tadalafil offers dual benefit [4]. Some men find one medication more effective or better tolerated than the other due to individual variation—switching between PDE5 inhibitors is common and appropriate when response is suboptimal.

Your prescriber will consider your medical history, current medications, cardiovascular health, frequency of sexual activity, and personal preferences when recommending treatment. Both viagra vs cialis require sexual stimulation to work—they do not cause spontaneous erections—and neither medication addresses underlying psychological causes of erectile dysfunction, which may benefit from counselling or psychosexual therapy alongside pharmacological treatment. At Cured Pharmacy, our clinical team provides personalised guidance to identify the most suitable option for your individual circumstances.

Scientific References

  1. Corbin, J. D., & Francis, S. H. (2002). Pharmacology of phosphodiesterase-5 inhibitors. International Journal of Clinical Practice, 56(6), 453-459.
  2. Yuan, J., Zhang, R., Yang, Z., Lee, J., Liu, Y., Tian, J., ... & Lyseng-Williamson, K. A. (2013). Comparative effectiveness and safety of oral phosphodiesterase type 5 inhibitors for erectile dysfunction: a systematic review and network meta-analysis. European Urology, 63(5), 902-912.
  3. 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.
  4. Eardley, I., Donatucci, C., Corbin, J., El-Meliegy, A., Hatzimouratidis, K., McVary, K., ... & Zeigler, H. (2010). Pharmacotherapy for erectile dysfunction. Journal of Sexual Medicine, 7(1), 524-540.
  5. Carson, C. C., & Lue, T. F. (2005). Phosphodiesterase type 5 inhibitors for erectile dysfunction. BJU International, 96(3), 257-280.

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

Which is more effective, viagra vs cialis?
Clinical trials show comparable efficacy between viagra vs cialis, with both achieving 60-80% successful intercourse rates. Individual response varies, and some men respond better to one medication over the other, making personal trial the best way to determine effectiveness for you.
Can I take viagra and cialis together?
No, you should never take viagra and cialis together or within 24 hours of each other, as this increases the risk of serious side effects including dangerously low blood pressure. Always use only one PDE5 inhibitor as directed by your prescriber.
How long does viagra vs cialis last?
Viagra (sildenafil) lasts approximately 4-6 hours, while Cialis (tadalafil) remains effective for up to 36 hours. This extended duration makes tadalafil ideal for spontaneity, whereas sildenafil offers a shorter, more predictable window.
Which is cheaper, viagra or cialis in the UK?
Generic sildenafil is significantly cheaper, starting from £9.19 per tablet at Cured Pharmacy, compared to generic tadalafil from £9.19. Branded versions cost more: Viagra Connect from £9.19 and Cialis from £9.19, making generics the most cost-effective choice.
Does cialis work better than viagra for daily use?
Yes, cialis (tadalafil) is specifically available in low-dose daily formulations (2.5mg or 5mg) designed for continuous daily use, allowing complete spontaneity. Viagra (sildenafil) is only licensed for as-needed use, making tadalafil superior for daily dosing strategies.
What are the main side effects of viagra vs cialis?
Both share common side effects like headache, flushing, and nasal congestion. Viagra more commonly causes visual disturbances (blue-tinted vision), while Cialis is more associated with back pain and muscle aches, though all side effects are generally mild and transient.
Can I switch from viagra to cialis or vice versa?
Yes, switching between viagra and cialis is safe and common when one medication doesn't provide optimal results or causes bothersome side effects. Consult your prescriber to discuss switching, as approximately 30-40% of non-responders to one PDE5 inhibitor respond to another.
Do I need a prescription for viagra vs cialis in the UK?
Viagra Connect 50mg is available over-the-counter without prescription for men 18+, but all other strengths of sildenafil and all doses of tadalafil require a prescription following clinical assessment. Cured Pharmacy provides free online consultations with UK-registered prescribers for both medications.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Last reviewed: 31 July 2026