Sildenafil vs Tadalafil UK: Which ED Treatment?

Clinically Proven UK Registered Pharmacy

Comparing Sildenafil and Tadalafil for ED Treatment

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

Comparing Sildenafil and Tadalafil for ED Treatment

Published on: June 03, 2026

Choosing between sildenafil vs tadalafil UK options is one of the most common questions we address at Cured Pharmacy. Both are highly effective phosphodiesterase type 5 (PDE5) inhibitors licensed by the MHRA for erectile dysfunction, but they differ significantly in onset time, duration of action, and how they fit into your lifestyle. Understanding these differences helps you and your UK prescriber select the treatment that aligns with your needs.

How Sildenafil and Tadalafil Work

Both sildenafil and tadalafil belong to the PDE5 inhibitor class, which means they work by blocking the enzyme phosphodiesterase type 5 [1]. This enzyme normally breaks down cyclic guanosine monophosphate (cGMP), a molecule that relaxes smooth muscle in penile blood vessels. By inhibiting PDE5, both medications allow cGMP levels to rise, promoting increased blood flow to the penis during sexual stimulation.

The key difference lies not in the mechanism itself, but in the pharmacokinetic properties — how quickly each medication is absorbed, how long it remains active, and how your body metabolises it [1]. Sildenafil reaches peak plasma concentration within 30 to 120 minutes and has a half-life of approximately 4 hours, whilst tadalafil peaks at around 2 hours and has a significantly longer half-life of 17.5 hours [2].

Neither medication causes spontaneous erections. Sexual stimulation is required for either treatment to produce an effect, as the physiological pathway depends on natural arousal signals from the nervous system.

Duration of Action: The Critical Difference

The most clinically significant distinction between sildenafil and tadalafil is duration of action. Sildenafil typically remains effective for 4 to 6 hours after administration, making it suitable for planned sexual activity within a defined window [1]. This shorter duration appeals to patients who prefer treatment only when needed and want the medication to clear their system relatively quickly.

Tadalafil, by contrast, can remain effective for up to 36 hours — earning it the informal descriptor 'the weekend pill' [2]. This extended window allows for greater spontaneity, as patients don't need to time sexual activity as precisely. Clinical trials have demonstrated that tadalafil maintains efficacy throughout this period, with patients reporting successful intercourse attempts well into the second day after dosing [3].

For some patients, tadalafil is prescribed as a daily low-dose treatment (2.5mg or 5mg), which maintains steady plasma levels and eliminates the need to plan around tablet timing altogether [3]. This approach is particularly valued by patients in stable relationships who prefer continuous readiness rather than on-demand dosing.

Choosing Based on Your Lifestyle

Your lifestyle and relationship patterns often determine which duration profile suits you best. Patients with predictable, planned intimate encounters may prefer sildenafil's shorter action, whilst those seeking flexibility over a weekend or who engage in sexual activity multiple times across 24 to 36 hours often favour tadalafil. Your UK prescriber will discuss these factors during your clinical assessment to recommend the most appropriate option.

Onset Time and Food Interactions

Sildenafil typically begins working within 30 to 60 minutes when taken on an empty stomach, though high-fat meals can delay absorption and reduce peak plasma concentration by up to 29% [1]. For optimal efficacy, clinical guidance recommends taking sildenafil at least one hour before sexual activity and avoiding heavy meals immediately beforehand.

Tadalafil is less affected by food intake, with no clinically significant reduction in absorption when taken with meals [2]. This makes tadalafil more convenient for patients who prefer not to adjust their eating schedule around medication timing. The onset for tadalafil is generally within 30 minutes to 2 hours, though individual response varies.

Both medications should be taken with water, and alcohol consumption should be moderate, as excessive alcohol can impair erectile function independently of the medication and may increase the risk of side effects such as dizziness or hypotension.

Feature Sildenafil Tadalafil
Onset of action 30–60 minutes 30 minutes–2 hours
Duration of effect 4–6 hours Up to 36 hours
Food interaction High-fat meals delay absorption Minimal food interaction
Dosing options On-demand only (25mg, 50mg, 100mg) On-demand (10mg, 20mg) or daily (2.5mg, 5mg)
Common side effects Headache, flushing, visual disturbances Headache, flushing, back pain, muscle aches
Starting price at Cured Pharmacy From £0.45 From £9.99

Sildenafil vs Tadalafil: Side Effect Profiles

The side effect profiles of sildenafil and tadalafil are broadly similar, reflecting their shared mechanism as PDE5 inhibitors [1][2]. Common side effects include headache, facial flushing, nasal congestion, and indigestion. These are typically mild to moderate and resolve without intervention.

Sildenafil is more commonly associated with visual disturbances, such as a blue tinge to vision or increased light sensitivity, due to mild cross-reactivity with PDE6 enzymes in the retina [1]. This effect is transient and resolves as the medication is metabolised. Tadalafil, with its longer half-life, may produce side effects that persist longer but are often reported as less intense per episode [2].

Back pain and muscle aches are slightly more common with tadalafil, affecting approximately 6% to 12% of users in clinical trials [3]. These symptoms typically appear 12 to 24 hours after dosing and resolve within 48 hours. Both medications can cause a small, transient reduction in blood pressure, so they are contraindicated in patients taking nitrates for angina.

Managing Side Effects

Most side effects diminish with continued use as your body adjusts to the medication. If you experience persistent or bothersome effects, your UK prescriber may adjust your dose or recommend switching between sildenafil and tadalafil, as individual tolerance varies. Never combine PDE5 inhibitors or exceed the prescribed dose.

Dosing Flexibility and Treatment Options

Sildenafil is available in 25mg, 50mg, and 100mg doses, with 50mg being the standard starting dose for most patients [1]. Your prescriber may adjust this based on efficacy and tolerability. Sildenafil should not be taken more than once per day.

Tadalafil offers both on-demand dosing (10mg and 20mg) and daily dosing (2.5mg and 5mg) [2]. The on-demand regimen is taken as needed, at least 30 minutes before sexual activity, whilst the daily regimen maintains continuous low-level PDE5 inhibition. Daily tadalafil is particularly suited to patients who engage in sexual activity more than twice weekly and prefer not to plan around tablet timing.

At Cured Pharmacy, we stock multiple formulations including generic sildenafil from £0.45, branded Viagra Connect, generic tadalafil, branded Cialis, and specialist formulations such as Sildenafil Eropid and Tadalafil Teva. All prescription options require a clinical assessment by a UK prescriber, who will determine the appropriate dose and formulation based on your medical history, current medications, and treatment goals.

Cost Considerations and Value for Money

Generic sildenafil represents exceptional value, with prices at Cured Pharmacy starting from £0.45 per tablet. This makes it one of the most cost-effective ED treatments available in the UK. Generic tadalafil starts from £0.45, reflecting the longer duration of action and the option for daily dosing regimens.

Branded options such as Viagra Connect and Cialis are also available for patients who prefer original formulations, though the active ingredients are bioequivalent to generics. Our transparent upfront pricing means you'll see the exact cost before completing your free online consultation, with no hidden fees.

When comparing cost-effectiveness, consider how often you'll use the medication. If you require treatment only occasionally, on-demand sildenafil offers the lowest per-use cost. For patients using treatment multiple times per week, daily tadalafil may provide better overall value despite a higher per-tablet price, as it eliminates the need for timing and planning.

Lowest Prices Guaranteed

Cured Pharmacy guarantees the lowest prices on ED treatments in the UK. Our direct relationships with licensed manufacturers and efficient online model allow us to pass savings directly to patients, without compromising on quality or clinical standards. All medications are UK-licensed and dispensed by our GPhC-registered pharmacy under the supervision of Superintendent Pharmacist Tarun Kumar (GPhC 2233073).

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. 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]
  3. Porst, H., Giuliano, F., Glina, S., Ralph, D., Casabé, A. R., Elion-Mboussa, A., & Sorsaburu, S. (2006). Evaluation of the efficacy and safety of once-a-day dosing of tadalafil 5mg and 10mg in the treatment of erectile dysfunction: results of a multicenter, randomized, double-blind, placebo-controlled trial. European Urology, 50(2), 351–359. https://doi.org/10.1016/j.eururo.2006.02.052 [accessed 13 August 2026]
  4. 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.

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 better, sildenafil or tadalafil?
Neither is universally 'better' — the choice depends on your lifestyle and preferences. Sildenafil suits planned activity with a shorter duration, whilst tadalafil offers up to 36 hours of effectiveness and greater spontaneity. Your UK prescriber will recommend the most appropriate option during your clinical assessment.
Can I switch from sildenafil to tadalafil?
Yes, many patients switch between treatments to find the best fit. Speak to your UK prescriber about your experience with your current medication, and they can assess whether switching to sildenafil or tadalafil would better suit your needs.
Is tadalafil stronger than sildenafil?
Tadalafil is not inherently 'stronger' — both medications have similar efficacy rates in clinical trials. The main difference is duration of action, not potency. Your prescriber will determine the appropriate dose for either medication based on your individual response.
How much does sildenafil vs tadalafil cost in the UK?
At Cured Pharmacy, sildenafil starts from £0.45 per tablet, whilst tadalafil starts from £0.45. Final pricing depends on your prescribed dose and quantity, which your UK prescriber determines after your free consultation.
Can I take sildenafil and tadalafil together?
No, you should never combine PDE5 inhibitors. Taking sildenafil and tadalafil together significantly increases the risk of serious side effects, including dangerous drops in blood pressure. Always use only one medication as prescribed.
Does tadalafil work better than sildenafil for older men?
Both medications are effective across all age groups, including older men. Some older patients prefer tadalafil's longer duration and reduced need for precise timing, whilst others favour sildenafil's shorter action. Your prescriber will consider your age, health conditions, and medications when recommending treatment.
How long should I try sildenafil or tadalafil before switching?
Clinical guidance suggests trying a medication on at least 4 to 6 separate occasions before concluding it's ineffective, as response can vary with factors like stress, arousal, and timing. If you're not achieving desired results after several attempts, consult your prescriber about dose adjustment or switching treatments.
Do I need a prescription for sildenafil vs tadalafil in the UK?
Yes, both sildenafil and tadalafil are prescription-only medications in the UK and require clinical assessment by a UK-registered prescriber. At Cured Pharmacy, you'll complete a free online consultation that takes under 3 minutes, reviewed by our UK clinical team before dispensing.
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.