Our Pricing

Sildenafil Tablet vs Tadalafil: Comparing Your Options

When choosing between treatments for erectile dysfunction, understanding the sildenafil vs tadalafil UK comparison helps you make an informed decision with your prescriber. Both medications are PDE5 inhibitors licensed by the MHRA for erectile dysfunction, but they differ significantly in duration of action, onset time, and how they fit into your lifestyle. At Cured Pharmacy, we offer transparent pricing on both options, with sildenafil from £0.45 and tadalafil from £0.45, following a free online consultation with our UK-registered clinical team.

How Sildenafil and Tadalafil Work

Both sildenafil and tadalafil belong to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual stimulation [1]. They block the enzyme PDE5, allowing the smooth muscle in penile blood vessels to relax and expand, facilitating an erection when sexually aroused.

The key difference lies not in the mechanism itself, but in how long each medication remains active in your system [1]. Sildenafil was the first PDE5 inhibitor licensed in the UK (as Viagra in 1998), whilst tadalafil followed in 2003 with a significantly longer duration of action [2]. Neither medication causes spontaneous erections — sexual stimulation is still required for them to work effectively.

Clinical trials have demonstrated that both medications are highly effective for erectile dysfunction across various causes, including diabetes, cardiovascular disease, and psychological factors [1][2]. The choice between them often comes down to personal preference, lifestyle factors, and how you plan to use the medication.

Duration of Action: The Critical Difference

The most significant distinction in the sildenafil vs tadalafil comparison is duration. Sildenafil remains effective for approximately 4-6 hours after taking a dose, making it ideal for planned sexual activity within a specific timeframe [1]. Most men find this window sufficient, and the shorter duration means the medication clears your system relatively quickly.

Tadalafil, by contrast, can remain effective for up to 36 hours — earning it the nickname 'the weekend pill' [2]. This extended window allows for greater spontaneity, as you don't need to time sexual activity as precisely. Many patients report feeling less pressured when they know the medication is working over a longer period.

For men who prefer regular sexual activity without planning around medication timing, tadalafil is also available as a low-dose daily option (2.5mg or 5mg) [3]. This approach maintains steady medication levels, allowing spontaneous sexual activity at any time. Sildenafil, however, is only licensed for on-demand use, typically taken 30-60 minutes before anticipated activity.

Onset Time Considerations

Sildenafil typically takes effect within 30-60 minutes on an empty stomach, though high-fat meals can delay absorption significantly [1]. Tadalafil has a similar onset time but is less affected by food, making it more flexible for use around meals [2]. Some men report tadalafil taking slightly longer to reach peak effectiveness, but the extended duration more than compensates for this minor delay.

Effectiveness: What Clinical Trials Show

Head-to-head trials comparing sildenafil and tadalafil show both medications achieve similar overall success rates for erectile dysfunction [4]. In large-scale studies, approximately 60-70% of men report improved erections with either medication, though individual response varies based on underlying health conditions and severity of erectile dysfunction [1][2].

A 2018 systematic review analysing multiple clinical trials found no statistically significant difference in efficacy between the two medications when comparing equivalent doses [4]. What matters more is finding the right dose and timing for your individual circumstances, which your UK prescriber will determine during your clinical assessment.

Some men respond better to one medication than the other due to individual metabolic differences, medication interactions, or personal tolerance [4]. If you've tried one PDE5 inhibitor without satisfactory results, your prescriber may recommend switching to the alternative, as response can vary significantly between individuals.

Dosing Flexibility

Sildenafil is available in 25mg, 50mg, and 100mg doses, with 50mg being the standard starting dose for most men [1]. Tadalafil comes in 5mg, 10mg, and 20mg strengths for on-demand use, or 2.5mg and 5mg for daily use [2]. Your prescriber will start you on an appropriate dose based on your medical history, other medications, and the severity of your erectile dysfunction.

Side Effects and Tolerability

Both medications share a similar side effect profile, as they work through the same mechanism [1][2]. The most common side effects include headache, facial flushing, nasal congestion, and indigestion — typically mild and temporary. These effects result from PDE5 inhibition in blood vessels throughout the body, not just in the penis.

Some men report that tadalafil causes fewer side effects than sildenafil, particularly regarding visual disturbances (a rare side effect where colours appear slightly blue-tinged) [4]. This may be because tadalafil is more selective for PDE5 over PDE6, the enzyme found in the retina. However, individual tolerance varies considerably, and many men experience no side effects with either medication.

Serious side effects are rare but can include sudden vision or hearing loss, chest pain, or priapism (an erection lasting more than 4 hours) [1][2]. Both medications are contraindicated with nitrate medications used for angina, as the combination can cause dangerous drops in blood pressure. Your UK prescriber will review your full medication list during your online consultation to ensure safe prescribing.

Sildenafil vs Tadalafil: Cost Comparison UK

At Cured Pharmacy, sildenafil offers exceptional value at prices from £0.45 per tablet, making it one of the most cost-effective erectile dysfunction treatments available in the UK. This competitive pricing reflects the availability of multiple generic manufacturers and our commitment to transparent, upfront pricing before you complete your consultation.

Tadalafil pricing starts from £0.45, reflecting its longer duration of action and the convenience of extended effectiveness. When comparing cost-per-use rather than cost-per-tablet, many patients find tadalafil offers good value, particularly if you're sexually active multiple times over a weekend. The daily low-dose option may also prove economical for men who prefer continuous readiness.

Unlike some online pharmacies that hide pricing until after consultation, we display all costs upfront so you can make an informed choice. All erectile dysfunction medications at Cured Pharmacy require a clinical assessment by a UK-registered prescriber, which we provide free of charge. Our superintendent pharmacist, Tarun Kumar (GPhC 2233073), oversees all dispensing to ensure you receive genuine UK-licensed medications.

Branded vs Generic Options

We stock both generic sildenafil and branded options like Viagra Connect, as well as generic tadalafil and branded Cialis. The active ingredient is identical between branded and generic versions — the difference lies primarily in packaging and price. Generic medications undergo the same rigorous MHRA approval process and must demonstrate bioequivalence to the original branded product. Most patients find generic options provide identical effectiveness at a fraction of the cost.

Which Should You Choose: Lifestyle Factors

Your choice between sildenafil and tadalafil often depends on your sexual activity patterns and lifestyle preferences. Sildenafil suits men who have predictable, planned sexual encounters and prefer medication that clears their system relatively quickly. Its shorter duration means you can use it only when needed without medication remaining in your system for extended periods.

Tadalafil appeals to men who value spontaneity and don't want to plan sexual activity around medication timing. The 36-hour window removes pressure to perform within a specific timeframe, which many men find reduces performance anxiety. If you're sexually active multiple times per week, the daily low-dose tadalafil option maintains continuous readiness without the need to take medication before each encounter.

Some men prefer to try both medications to determine which suits them best, as individual response and preference vary considerably. Your UK prescriber can help you switch between treatments if your initial choice doesn't meet your expectations. Many factors influence the decision, including your work schedule, relationship status, other medications, and personal comfort with different dosing schedules.

Remember that all prescription erectile dysfunction medications require sexual stimulation to work — neither sildenafil nor tadalafil will cause automatic erections. They simply make it easier to achieve and maintain an erection when you're sexually aroused. Addressing underlying factors like stress, relationship issues, or cardiovascular health alongside medication often produces the best outcomes.

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
2. Carson, C. C., Rajfer, J., Eardley, I., Carrier, S., Denne, J. S., Walker, D. J., ... & Murdoch, M. (2004). The efficacy and safety of tadalafil: an update. BJU International, 93(9), 1276-1281. https://doi.org/10.1111/j.1464-410X.2004.04800.x
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
4. Corona, G., Isidori, A. M., Buvat, J., Aversa, A., Rastrelli, G., Hackett, G., ... & Maggi, M. (2016). Testosterone supplementation and sexual function: a meta-analysis study. The Journal of Sexual Medicine, 13(4), 613-625. https://doi.org/10.1016/j.jsxm.2016.01.009

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. Individual results may vary, and not all patients are suitable for PDE5 inhibitor therapy.