Viagra vs Cialis UK: Which Works Best? | Cured Pharmacy

Clinically Proven UK Registered Pharmacy

Cheapest Viagra vs Cialis: Complete 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 vs Cialis: Complete Comparison Guide

Published on: June 03, 2026

When comparing viagra vs cialis uk comparison options, understanding the key differences between these two leading erectile dysfunction treatments helps you make an informed choice. Both medications are clinically proven to improve erectile function, but they differ significantly in duration of action, onset time, and how they fit into your lifestyle. At Cured Pharmacy, our UK-registered clinical team provides expert guidance to help you select the most suitable treatment, with sildenafil available from £0.45 and tadalafil from £0.45.

How Viagra and Cialis Work: The Science Behind ED Treatment

Both Viagra (sildenafil) and Cialis (tadalafil) belong to a class of medications called PDE5 inhibitors, which work by relaxing blood vessels in the penis to improve blood flow during sexual stimulation [1]. Neither medication causes automatic erections—sexual arousal is still required for them to work effectively.

The key difference lies in their pharmacokinetic profiles. Sildenafil has a half-life of approximately 4 hours, whilst tadalafil's half-life extends to 17.5 hours, allowing for a much longer window of effectiveness [2]. This fundamental difference influences how each medication fits into your daily routine and intimate relationships.

Clinical trials demonstrate that both medications significantly improve erectile function scores compared to placebo. In pivotal studies, approximately 70-80% of men with erectile dysfunction reported improved erections with sildenafil, whilst tadalafil showed similar efficacy rates across multiple dosing regimens [1][3].

Duration of Action: Short-Term vs Long-Term Coverage

Viagra remains effective for approximately 4-6 hours after taking a dose, making it ideal for planned sexual activity within a specific timeframe [2]. Most men take sildenafil 30-60 minutes before anticipated intimacy, allowing the medication to reach peak plasma concentrations.

Cialis offers two distinct approaches: on-demand dosing (10mg or 20mg taken before sexual activity) provides up to 36 hours of coverage, whilst daily low-dose tadalafil (2.5mg or 5mg) maintains continuous therapeutic levels [3]. This extended duration has earned tadalafil the nickname 'the weekend pill' among patients seeking spontaneity.

The choice between short and long duration depends entirely on your lifestyle and relationship dynamics. Men who prefer planned intimacy often find sildenafil's shorter window perfectly adequate, whilst those valuing spontaneity over multiple days typically prefer tadalafil's extended coverage.

Daily vs On-Demand Dosing

Daily tadalafil (2.5mg or 5mg) allows complete spontaneity without timing medications around sexual activity, as therapeutic levels remain constant in your system [3]. This regimen suits men who engage in sexual activity more than twice weekly and prefer not to plan ahead. On-demand dosing—whether sildenafil or higher-dose tadalafil—provides flexibility for those with less frequent intimate encounters whilst avoiding daily medication.

Onset Time and Food Interactions: Practical Considerations

Sildenafil typically begins working within 30-60 minutes on an empty stomach, though high-fat meals can delay absorption and reduce peak effectiveness [2]. For optimal results, many clinicians recommend taking Viagra at least 2 hours after eating or on an empty stomach.

Tadalafil demonstrates more consistent absorption regardless of food intake, making it more convenient for men who prefer not to plan meals around medication [3]. Onset time ranges from 30 minutes to 2 hours, with most men experiencing effects within the first hour.

This practical difference matters significantly in real-world use. If you're dining out before intimacy, tadalafil's food-independent absorption offers greater flexibility, whilst sildenafil requires more careful timing to achieve optimal results.

Feature Viagra (Sildenafil) Cialis (Tadalafil)
Duration of action 4-6 hours Up to 36 hours (on-demand) or continuous (daily)
Onset time 30-60 minutes 30 minutes to 2 hours
Food interaction High-fat meals delay absorption Can be taken with or without food
Dosing options 25mg, 50mg, 100mg (on-demand) 2.5mg, 5mg (daily) or 10mg, 20mg (on-demand)
Common side effects Headache, flushing, visual disturbances Headache, back pain, muscle aches
Starting price at Cured Pharmacy From £0.45 From £9.99

Side Effects: What to Expect from Each Medication

Both medications share a similar side effect profile, as they work through the same mechanism. Common effects include headache (occurring in 10-16% of users), facial flushing, nasal congestion, and indigestion [1][4]. These effects are generally mild to moderate and decrease with continued use.

Sildenafil is more frequently associated with visual disturbances—a temporary blue tinge to vision or increased light sensitivity—affecting approximately 3-11% of users at higher doses [4]. This occurs because sildenafil has slight activity against PDE6, an enzyme present in retinal photoreceptors.

Tadalafil users more commonly report back pain and muscle aches (affecting 5-10% of patients), typically appearing 12-24 hours after dosing and resolving within 48 hours [4]. These musculoskeletal effects relate to PDE11 inhibition in skeletal muscle tissue. Your UK prescriber will consider your individual risk factors and medical history when recommending either medication.

Managing Common Side Effects

Most side effects are transient and manageable. Headaches often respond to simple analgesia like paracetamol, whilst staying well-hydrated can reduce flushing and nasal congestion. If you experience persistent or bothersome effects, your prescriber may adjust your dose or suggest switching medications. Never take PDE5 inhibitors with nitrate medications, as this combination can cause dangerous blood pressure drops [1].

Viagra vs Cialis UK: Cost and Value Comparison

Generic sildenafil represents the most cost-effective erectile dysfunction treatment available in the UK, with prices at Cured Pharmacy starting from £0.45 per tablet. This makes it accessible for men who use treatment occasionally or want to trial ED medication without significant financial commitment.

Generic tadalafil starts from £0.45 at Cured Pharmacy, offering excellent value when you consider the extended duration of action. Daily low-dose tadalafil provides continuous coverage at competitive UK pricing, whilst on-demand higher doses deliver up to 36 hours of effectiveness per tablet.

Branded Viagra Connect (50mg) starts from £0.45, whilst branded Cialis (tadalafil) begins at £0.45. The significant price difference between branded and generic versions reflects patent expiry rather than any difference in clinical efficacy—generic medications contain identical active ingredients and meet the same MHRA licensing standards [5].

Which Treatment Is Right for You: Clinical Considerations

Your ideal choice depends on several factors: frequency of sexual activity, preference for spontaneity versus planning, side effect tolerance, and any existing medical conditions. Men engaging in sexual activity multiple times weekly often benefit from daily tadalafil's continuous coverage, whilst those with occasional intimacy may prefer on-demand sildenafil.

Certain medical conditions influence medication selection. Patients taking alpha-blockers for prostate symptoms require careful dose adjustment with either medication, though tadalafil is specifically licensed for combined treatment of erectile dysfunction and benign prostatic hyperplasia [3]. Those with cardiovascular conditions require thorough assessment before starting any PDE5 inhibitor.

At Cured Pharmacy, our UK-registered prescribers conduct comprehensive online consultations—typically completed in under 3 minutes—to assess your medical history, current medications, and treatment goals. This clinical assessment ensures you receive the most appropriate medication at the optimal dose, with genuine UK-licensed medicines dispensed by our GPhC-registered pharmacy team led by Superintendent Pharmacist Tarun Kumar (GPhC 2233073).

Starting Your Treatment Journey

Begin with our free online consultation, where you'll answer questions about your medical history, current health status, and treatment preferences. A UK prescriber reviews your assessment and, if clinically appropriate, issues a prescription for sildenafil or tadalafil at the most suitable dose. All medications are dispensed in 100% discreet packaging with transparent upfront pricing—you'll see exact costs before completing your consultation.

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. 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 13 August 2026]
  3. Brock, G. B., McMahon, C. G., Chen, K. K., Costigan, T., Shen, W., Watkins, V., Anglin, G., & Whitaker, S. (2002). Efficacy and safety of tadalafil for the treatment of erectile dysfunction: results of integrated analyses. Journal of Urology, 168(4 Pt 1), 1332–1336. https://doi.org/10.1016/S0022-5347(05)64442-4 [accessed 13 August 2026]
  4. 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]
  5. Medicines and Healthcare products Regulatory Agency. (2020). Generic medicines: overview. GOV.UK. https://www.gov.uk/government/publications/generic-medicines [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. Erectile dysfunction can be a sign of underlying health conditions—speak to your GP if you have concerns about your cardiovascular health or general wellbeing.

Trusted by thousands

Real people, real results

Jane L.

"Brilliant. Lost 4 stone on mounjaro no side effects at all. Cured pharmacy are excellent. Always helpful pens sent out quickly always comes with needles and sterile wipes. If you want to go on GLP-1 go to cured pharmacy. So professional. Thank you cured pharmacy you changed my health and well being."

Ann-Marie

"I absolutely love this product, I have been using 2.5mg as maintenance dose and have managed to control my weight without any side effects and can still eat well balanced meals. The pharmacy is very efficient friendly and helpful I would not purchase from anywhere else."

Sacha W.

"So far I'm really impressed by my results it's crazy cause I'm not snacking like how I used to do and I see my face slimming down already and it's only been 2 and a half weeks. Can't wait to give my feedback in 5 months time thank you cured pharmacy."

Kimberly G.

"Mounjaro has corrected my hormonal weight gain during menopause. I am using it now to maintain that balance. The results for me have been exceptional!"

Jennifer

"Great really helps cure those nasty habits can't wait for my next mounjaro pen."

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

Which is more effective: Viagra or Cialis?
Clinical trials show both medications are similarly effective, with 70-80% of men experiencing improved erections. The choice depends on your lifestyle preferences rather than superior efficacy—sildenafil offers shorter duration whilst tadalafil provides extended coverage.
Can I take Viagra and Cialis together?
No, you should never combine PDE5 inhibitors, as this significantly increases the risk of serious side effects including dangerous blood pressure drops. Your UK prescriber will help you select one appropriate medication at the correct dose.
How long does Cialis last compared to Viagra?
Viagra remains effective for approximately 4-6 hours, whilst on-demand Cialis provides up to 36 hours of coverage. Daily low-dose tadalafil maintains continuous therapeutic levels for complete spontaneity.
Is generic sildenafil as good as branded Viagra?
Yes, generic sildenafil contains the identical active ingredient and meets the same MHRA licensing standards as branded Viagra. The significant price difference reflects patent expiry rather than any clinical difference.
Which has fewer side effects: Viagra or Cialis?
Both share similar side effect profiles, though sildenafil more commonly causes visual disturbances whilst tadalafil is associated with back pain and muscle aches. Most side effects are mild and transient with either medication.
Can I drink alcohol with Viagra or Cialis?
Moderate alcohol consumption is generally safe with both medications, though excessive drinking can impair erectile function and increase side effects like dizziness. Limit alcohol intake to 1-2 units when using ED treatment.
Do I need a prescription for Viagra or Cialis in the UK?
Yes, both sildenafil and tadalafil are prescription-only medications requiring clinical assessment by a UK-registered prescriber. At Cured Pharmacy, our free online consultation takes under 3 minutes to complete.
Which is better for daily use: Viagra or Cialis?
Cialis (tadalafil) is specifically formulated for daily use at lower doses (2.5mg or 5mg), providing continuous coverage. Viagra (sildenafil) is designed for on-demand use only and is not licensed for daily administration.
How much does Viagra vs Cialis cost at Cured Pharmacy?
Viagra typically costs from £4.90 per tablet at Cured Pharmacy, while Cialis starts from £6.99 per tablet, with generic versions available at lower prices. Our online consultation is free, and prices include prescription and clinical review from UK-registered clinicians.
Can I get Viagra or Cialis without a prescription in the UK?
No, both Viagra and Cialis are prescription-only medicines in the UK and cannot be legally obtained without a valid prescription. Cured Pharmacy provides a free online consultation with UK-registered clinicians who can issue a prescription if clinically appropriate.
How quickly can Cured Pharmacy deliver Viagra or Cialis in the UK?
Cured Pharmacy offers discreet next-day delivery across the UK when you order before our cut-off time. All orders are dispatched in plain, unmarked packaging from our UK-registered pharmacy for complete privacy and convenience.
Is it safe to switch between Viagra and Cialis?
Yes, it's generally safe to switch between Viagra and Cialis under medical guidance, as both work similarly but have different durations of action. Our clinicians at Cured Pharmacy can advise on which treatment best suits your lifestyle and health profile during your free consultation.
Which lasts longer: Viagra or Cialis in the UK?
Cialis lasts significantly longer than Viagra, with effects lasting up to 36 hours compared to Viagra's 4-6 hours. This makes Cialis ideal for spontaneity, while Viagra works faster (within 30-60 minutes), and our Cured Pharmacy clinicians can help you choose the best option.
How quickly can I get Viagra or Cialis delivered in the UK?
Cured Pharmacy offers next-day discreet delivery across the UK when you order before our cut-off time. All orders are dispatched from our UK-registered pharmacy in plain, unmarked packaging to protect your privacy.
Which lasts longer: Viagra or Cialis?
Cialis lasts significantly longer, remaining effective for up to 36 hours, while Viagra typically works for 4-6 hours. This makes Cialis ideal for those seeking more spontaneity, whereas Viagra suits those who prefer to plan ahead for sexual activity.
How much do Viagra and Cialis cost at Cured Pharmacy?
Viagra typically costs from £4.50 per tablet for the 50mg dose, while Cialis starts from £6.99 per 10mg tablet at Cured Pharmacy. Generic versions of both medications are also available at lower prices, offering the same active ingredients and effectiveness as branded options.
Can I switch between Viagra and Cialis safely?
Yes, you can safely switch between Viagra and Cialis, but you should not take both medications within the same 24-hour period. Cured Pharmacy's clinicians can help you transition between treatments during your consultation, ensuring you find the most suitable option for your lifestyle and needs.
Can I get Viagra or Cialis without seeing a GP in the UK?
Yes, Cured Pharmacy offers a free online consultation service that removes the need for a GP appointment. Our UK-registered pharmacist prescribers review your consultation and issue a prescription if the treatment is suitable and safe for you.
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


How we source info.

When we present you with stats, data, opinion or a consensus, we'll tell you where this came from.