Sildenafil vs Tadalafil UK - Compare Prices & Effects

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Sildenafil vs Tadalafil UK - Compare Cheapest Prices

Compare sildenafil and tadalafil at the cheapest UK price from £0.45 with 20% off using code Ednew.

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Sildenafil Versus Tadalafil: Clinical Comparison for Erectile Dysfunction

Published on: June 03, 2026

When comparing sildenafil versus tadalafil, you're choosing between two highly effective phosphodiesterase type 5 (PDE5) inhibitors with distinct pharmacological profiles. Both medications treat erectile dysfunction by enhancing blood flow to the penis, but they differ significantly in onset time, duration of action, and dosing flexibility. Understanding these differences helps you and your prescriber select the treatment that best aligns with your lifestyle and clinical needs.

How Sildenafil Versus Tadalafil Work: Mechanism of Action

Both sildenafil versus tadalafil function as selective PDE5 inhibitors, blocking the enzyme that degrades cyclic guanosine monophosphate (cGMP) in penile smooth muscle tissue [1]. When sexual stimulation triggers nitric oxide release, cGMP accumulates and causes vasodilation, allowing increased blood flow into the corpus cavernosum. This physiological mechanism is identical for both medications, but their pharmacokinetic profiles create meaningful clinical distinctions.

Sildenafil reaches peak plasma concentration within 30 to 120 minutes and maintains therapeutic effect for approximately 4 to 6 hours, making it suitable for planned sexual activity [1]. Tadalafil, conversely, has a significantly longer half-life of 17.5 hours, providing a therapeutic window of up to 36 hours after a single dose [2]. This extended duration allows for greater spontaneity, as the medication remains effective throughout the following day and into the next evening.

The selectivity profile also differs slightly: sildenafil has approximately 10-fold selectivity for PDE5 over PDE6 (an enzyme in retinal photoreceptors), whilst tadalafil demonstrates over 700-fold selectivity for PDE5 over PDE6 [3]. This explains why visual disturbances such as blue-tinted vision occur more frequently with sildenafil than tadalafil, though both remain rare side effects in clinical practice.

Efficacy Comparison: Sildenafil Versus Tadalafil Clinical Outcomes

Large-scale randomised controlled trials demonstrate comparable efficacy when comparing sildenafil versus tadalafil for erectile dysfunction. A systematic review analysing over 20,000 patients found that both medications significantly improved International Index of Erectile Function (IIEF) scores compared to placebo, with no statistically significant difference in overall treatment success rates [4].

Sildenafil clinical trials report success rates (defined as achieving and maintaining erections sufficient for satisfactory sexual intercourse) ranging from 62% to 82% across doses of 25mg to 100mg [1]. Tadalafil studies demonstrate similar efficacy, with success rates between 61% and 81% for doses from 5mg to 20mg [2]. Patient preference studies reveal that many men favour tadalafil's longer duration for lifestyle flexibility, whilst others prefer sildenafil's shorter action window and lower cost per dose.

Response rates vary based on underlying aetiology: both medications show higher efficacy in psychogenic erectile dysfunction compared to organic causes such as diabetes or post-prostatectomy dysfunction. In diabetic populations, success rates decrease to approximately 56% for sildenafil and 58% for tadalafil, but both remain significantly superior to placebo [4].

Onset Time and Duration Differences

The most clinically relevant distinction when evaluating sildenafil versus tadalafil lies in pharmacokinetic timing. Sildenafil typically requires 30 to 60 minutes before sexual activity, with optimal absorption occurring on an empty stomach (high-fat meals can delay onset by up to 60 minutes) [1]. Tadalafil can be taken 30 minutes to 12 hours before anticipated activity, offering substantially more flexibility in timing.

For men seeking daily spontaneity, tadalafil is available in low-dose daily formulations (2.5mg or 5mg), creating steady-state plasma levels that eliminate the need for timed dosing altogether [2]. This daily regimen suits men who engage in sexual activity more than twice weekly. Sildenafil lacks a licensed daily-use indication in the UK, remaining an on-demand treatment exclusively.

Side Effect Profile: Sildenafil Versus Tadalafil Safety Comparison

Both sildenafil versus tadalafil share a similar adverse event profile, with most side effects being mild to moderate and transient. The most commonly reported effects include headache (11-16% of users), flushing (10-13%), dyspepsia (4-12%), and nasal congestion (4-10%) [1][2]. These symptoms result from PDE5 inhibition in vascular beds beyond penile tissue, causing systemic vasodilation.

Sildenafil demonstrates a slightly higher incidence of visual disturbances (approximately 3% of users report blue-tinted vision or increased light sensitivity) due to its lower selectivity for PDE6 in retinal tissue [3]. Tadalafil users more frequently report back pain (6% versus 2% with sildenafil) and myalgia, likely related to PDE11 inhibition in skeletal muscle [2]. These differences rarely lead to treatment discontinuation in clinical practice.

Contraindications are identical for both medications: neither should be used concurrently with nitrates (including GTN spray or isosorbide mononitrate) due to risk of severe hypotension, nor with riociguat or other PDE5 inhibitors [1][2]. Both require caution in men with cardiovascular disease, and sexual activity itself carries inherent cardiac demand. Your prescriber will assess cardiovascular risk before approving either treatment.

Drug Interactions and Precautions

When comparing sildenafil versus tadalafil for drug interaction potential, both are metabolised primarily via hepatic CYP3A4 enzymes. Strong CYP3A4 inhibitors such as ritonavir, ketoconazole, and itraconazole significantly increase plasma concentrations of both medications, necessitating dose reductions [1][2]. Alpha-blockers used for benign prostatic hyperplasia can potentiate hypotensive effects, requiring careful dose titration and timing separation.

Tadalafil's longer half-life means drug interactions persist for a more extended period compared to sildenafil. If you take tadalafil 20mg on Friday evening, CYP3A4 inhibitors started on Saturday will still affect circulating tadalafil levels on Sunday. This extended interaction window requires greater prescriber vigilance when reviewing your complete medication list during clinical assessment.

Feature Sildenafil Tadalafil
Onset of action 30-60 minutes 30 minutes to 12 hours
Duration of effect 4-6 hours Up to 36 hours
Food interaction Delayed by high-fat meals No food interaction
Daily dosing option Not licensed 2.5mg or 5mg daily
Starting UK price (Cured Pharmacy) From £0.45 per tablet From £9.99 per 4 tablets
Visual side effects More common (3%) Rare (<1%)
Back pain/myalgia Uncommon (2%) More common (6%)
Ideal for Planned activity, cost-conscious Spontaneity, frequent use

Dosing Flexibility: Sildenafil Versus Tadalafil Regimens

Sildenafil is licensed in the UK at 25mg, 50mg, and 100mg doses, taken on-demand approximately one hour before sexual activity, with a maximum frequency of once daily [1]. Most men start at 50mg, with dose adjustment based on efficacy and tolerability. The lower 25mg dose suits older patients or those taking interacting medications, whilst 100mg serves as the maximum licensed dose for men requiring higher exposure.

Tadalafil offers two distinct dosing strategies when considering sildenafil versus tadalafil flexibility. On-demand dosing uses 10mg or 20mg taken at least 30 minutes before activity, effective for up to 36 hours [2]. Daily dosing employs 2.5mg or 5mg taken at the same time each day, creating continuous therapeutic coverage without timed administration. This daily regimen particularly benefits men with frequent sexual activity or those who find on-demand dosing psychologically burdensome.

Cost considerations influence dosing choice significantly: sildenafil 50mg starts from £0.45 per tablet at Cured Pharmacy, making it the most economical option for infrequent use. Tadalafil daily dosing, whilst more expensive per month, eliminates per-event costs and may prove more cost-effective for men engaging in sexual activity three or more times weekly. Your prescriber will discuss dosing strategy during your online consultation.

Food and Alcohol Interactions: Sildenafil Versus Tadalafil

Dietary factors create another meaningful distinction when evaluating sildenafil versus tadalafil. Sildenafil absorption is significantly delayed by high-fat meals, with peak plasma concentration occurring up to 60 minutes later and maximum concentration reduced by approximately 29% [1]. Men taking sildenafil achieve optimal results on an empty stomach or after a light meal, which can limit spontaneity during dinner dates or evening meals.

Tadalafil absorption remains largely unaffected by food intake, allowing administration without regard to meals [2]. This food-independent pharmacokinetic profile enhances convenience and reduces the need for planning around dietary timing. Both medications can be taken with moderate alcohol consumption (up to 3-4 units), though excessive alcohol independently impairs erectile function and may reduce treatment efficacy.

Grapefruit juice inhibits intestinal CYP3A4 and should be avoided with both sildenafil versus tadalafil, as it can increase plasma concentrations unpredictably [3]. This interaction persists for 24 hours after grapefruit consumption, so men taking either medication should eliminate grapefruit from their diet entirely during treatment periods.

Lifestyle Considerations and Patient Preference

Patient preference studies consistently show that men value different attributes when choosing between sildenafil versus tadalafil. Younger men with unpredictable sexual activity patterns often prefer tadalafil's extended duration, whilst older men in stable relationships with more predictable intimacy may favour sildenafil's shorter action and lower per-dose cost [4].

Psychological factors also influence choice: some men report that tadalafil's 36-hour window reduces performance anxiety by eliminating strict timing requirements, whilst others prefer sildenafil's defined therapeutic window, appreciating the clear onset and offset of medication effect. Your prescriber can help identify which pharmacological profile aligns best with your individual circumstances during your confidential online assessment.

UK Pricing and Access: Sildenafil Versus Tadalafil Cost Comparison

Cost represents a significant consideration when comparing sildenafil versus tadalafil in the UK market. Generic sildenafil, available since patent expiry in 2013, offers the most economical erectile dysfunction treatment, with prices starting from £0.45 per 50mg tablet at Cured Pharmacy following online prescriber assessment. This represents exceptional value for men requiring occasional treatment or those managing ED on a budget.

Tadalafil pricing varies by formulation and brand: generic tadalafil starts from £0.45 for a 4-tablet pack, whilst branded Cialis commands premium pricing at £0.45 for equivalent quantities [5]. Daily-dose tadalafil (2.5mg or 5mg) requires 30-tablet monthly supplies, creating higher ongoing costs compared to on-demand sildenafil. However, for men using treatment frequently, the per-event cost may balance favourably when tadalafil's extended duration eliminates the need for multiple doses.

Cured Pharmacy offers transparent upfront pricing for both sildenafil versus tadalafil options, with costs displayed before your clinical consultation begins. New patients receive 20% off their first order using code Ednew, and all treatments include free online assessment by UK-registered prescribers, discreet packaging, and next-day delivery options. As a GPhC-registered pharmacy (9012511), we supply only genuine UK-licensed medications following appropriate clinical approval.

NHS Versus Private Prescription Access

NHS prescription availability for erectile dysfunction is restricted to specific patient groups, including men with diabetes, prostate cancer, spinal cord injury, or other qualifying medical conditions [5]. Most men require private prescriptions for both sildenafil versus tadalafil, making online pharmacy services like Cured Pharmacy a convenient and cost-effective access route.

Our online consultation process takes under 3 minutes and is reviewed by UK-registered prescribers who assess suitability based on your medical history, current medications, and cardiovascular risk factors. This ensures safe, appropriate treatment whilst maintaining the convenience and discretion that many men prefer when addressing erectile dysfunction. All consultations remain strictly confidential and comply with MHRA and GPhC regulatory standards.

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. [accessed 13 August 2026]
  2. Brock, G. B., McMahon, C. G., Chen, K. K., Costigan, T., Shen, W., Watkins, V., ... & Viktrup, L. (2002). Efficacy and safety of tadalafil for the treatment of erectile dysfunction: results of integrated analyses. Journal of Urology, 168(4), 1332-1336. [accessed 13 August 2026]
  3. Doggrell, S. A. (2005). Comparison of clinical trials with sildenafil, vardenafil and tadalafil in erectile dysfunction. Expert Opinion on Pharmacotherapy, 6(1), 75-84. [accessed 13 August 2026]
  4. Yuan, J., Zhang, R., Yang, Z., Lee, J., Liu, Y., Tian, J., ... & Pu, J. (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. [accessed 13 August 2026]
  5. National Institute for Health and Care Excellence. (2024). Erectile dysfunction: NICE guideline [NG178]. NICE. [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.

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Faq

Which is more effective, sildenafil versus tadalafil?
Clinical trials show no significant difference in overall efficacy between sildenafil versus tadalafil, with both achieving 60-80% success rates. The choice depends on your preference for duration and timing rather than effectiveness.
Can I switch between sildenafil and tadalafil?
Yes, you can switch between sildenafil versus tadalafil treatments after discussing with your prescriber. Many men try both to determine which pharmacological profile suits their lifestyle and response pattern best.
Is sildenafil or tadalafil cheaper in the UK?
Sildenafil is significantly cheaper per dose, starting from £0.45 at Cured Pharmacy. Tadalafil costs more per tablet but lasts up to 36 hours, potentially offering better value for frequent users when comparing sildenafil versus tadalafil.
Do sildenafil and tadalafil have the same side effects?
Both share common side effects like headache and flushing, but sildenafil causes visual disturbances more frequently, whilst tadalafil more commonly causes back pain when comparing sildenafil versus tadalafil safety profiles.
Can I take sildenafil and tadalafil together?
No, you must never combine sildenafil versus tadalafil or take them within 24 hours of each other. Both are PDE5 inhibitors, and concurrent use dangerously increases hypotension risk and adverse effects.
Which works faster, sildenafil or tadalafil?
Both sildenafil versus tadalafil begin working within 30-60 minutes, though individual response varies. Sildenafil may have a slightly faster onset for some men, particularly when taken on an empty stomach.
Does tadalafil last longer than sildenafil?
Yes, tadalafil remains effective for up to 36 hours compared to sildenafil's 4-6 hour duration. This represents the most significant practical difference when comparing sildenafil versus tadalafil for lifestyle flexibility.
Do I need a prescription for sildenafil or tadalafil in the UK?
Yes, both sildenafil versus tadalafil require prescription-only approval from a UK-registered prescriber. Cured Pharmacy provides free online consultations reviewed by qualified prescribers, with treatment approved subject to clinical suitability.
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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