Tadalafil vs Vardenafil: Which ED Treatment Suits You?

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Tadalafil vs Vardenafil: A Balanced Comparison for Erectile Dysfunction

Published: 17 October 2026

When comparing tadalafil vs vardenafil, the key differences lie in how long each medicine lasts and how quickly it starts working. Both are PDE5 inhibitors licensed in the UK to treat erectile dysfunction (ED), and both require sexual stimulation to work [4][5]. This guide compares their onset times, duration of effect, food interactions, available strengths, side effects, and who each option may suit, helping you make an informed choice with your prescriber.

How Tadalafil and Vardenafil Work

Both tadalafil and vardenafil belong to a class of medicines called phosphodiesterase type 5 (PDE5) inhibitors [4][5]. They work by relaxing the blood vessels in the penis, allowing increased blood flow when you are sexually aroused. This can help you achieve and maintain an erection suitable for sexual activity [1].

It is important to understand that neither medicine causes an automatic erection. Sexual stimulation is still needed for them to work [4][5]. They do not increase sexual desire, and they are not a cure for erectile dysfunction—they treat the symptoms by improving blood flow during arousal.

Both medicines are prescription-only in the UK, meaning they are only supplied after an online or face-to-face consultation reviewed by a UK-registered prescriber [2]. The prescriber will check your medical history, current medicines, and whether either option is safe and suitable for you. If you are experiencing ED for the first time, it is advisable to see your GP, as ED can sometimes be an early sign of conditions such as heart disease or diabetes [1].

Tadalafil vs Vardenafil: How Quickly Do They Work?

Vardenafil typically starts working within 25 to 60 minutes of taking it [5]. This makes it a relatively fast-acting option, though you should plan to take it about an hour before you anticipate sexual activity. The onset can vary slightly between individuals, depending on factors such as whether you have eaten recently.

Tadalafil usually begins to work within 30 minutes, though it can take up to 2 hours for some people [4]. While the onset is similar to vardenafil, tadalafil's real advantage lies not in how quickly it starts but in how long it lasts, which we will explore in the next section.

Both medicines require you to be sexually aroused for an erection to occur [4][5]. If you are unsure which onset time suits your lifestyle better, discuss this with your prescriber during your consultation. They can help you choose based on how spontaneous you would like your treatment to be.

Planning Around Onset Times

If you prefer a medicine that works relatively quickly and you can plan ahead by about an hour, vardenafil may be a practical choice [5]. On the other hand, if you want flexibility over a longer window of time, tadalafil's extended duration may be more convenient, even though its onset is similar [4]. Your prescriber can guide you based on your preferences and medical suitability.

How Long Do Tadalafil and Vardenafil Last?

This is where the tadalafil vs vardenafil comparison shows the most significant difference. Tadalafil can remain effective for up to 36 hours after taking it [4]. This long duration has earned it the nickname 'the weekend pill', as a single dose taken on Friday evening may still be effective on Sunday morning. This does not mean you will have an erection for 36 hours—it means the medicine is available in your system to help you achieve an erection when you are sexually stimulated during that window.

Vardenafil, by contrast, typically lasts for around 4 to 5 hours [5]. This shorter duration may suit men who prefer a more predictable timeframe or who do not need the extended window that tadalafil offers. It can also feel more 'on-demand', as the effect wears off more quickly after sexual activity.

The choice between a longer or shorter duration depends on your lifestyle and how often you anticipate sexual activity. Some men prefer the spontaneity and reduced need for planning that tadalafil offers, while others appreciate the shorter, more controlled effect of vardenafil [2]. Neither option is better for everyone—it is about what fits your needs.

Food and Alcohol: Do They Affect Tadalafil or Vardenafil?

Tadalafil can be taken with or without food, and meals do not significantly affect how well it works [4]. This makes it a flexible option if you plan to take it around mealtimes or prefer not to worry about timing your dose with food.

Vardenafil is also generally unaffected by food, though a very high-fat meal may slightly delay how quickly it starts working [5]. For most men, this is not a major concern, but if you are planning to take vardenafil after a large, fatty meal, you might allow a little extra time for it to take effect.

Both medicines can interact with alcohol. Heavy drinking can make erectile dysfunction worse and may add to the blood-pressure-lowering effect of PDE5 inhibitors, increasing the risk of dizziness or fainting [4][5]. Moderate alcohol is usually fine, but it is sensible to stay within recommended limits. Grapefruit juice can raise the levels of both tadalafil and vardenafil in your blood and should be avoided [4][5].

Practical Advice on Timing

If you prefer complete flexibility around meals, tadalafil may have a slight edge [4]. If you occasionally eat high-fat meals, simply allow a bit more time for vardenafil to work, or take it before eating [5]. Your prescriber can offer personalised advice based on your routine.

Available Strengths and Dosing for Tadalafil vs Vardenafil

Tadalafil is available in the UK in 10 mg and 20 mg tablets for on-demand use (taken before sexual activity) [4]. There is also a lower-dose daily option (2.5 mg or 5 mg) designed to be taken every day, which is not covered in this comparison but may suit men who prefer continuous treatment. The usual starting dose for on-demand tadalafil is 10 mg, taken at least 30 minutes before sex, with a maximum of one dose per day [4].

Vardenafil is available in 5 mg, 10 mg, and 20 mg tablets [5]. The typical starting dose is 10 mg, taken about 25 to 60 minutes before sexual activity, again with a maximum of one dose per day. Your prescriber may adjust the dose based on how well it works and any side effects you experience.

At Cured Pharmacy, we offer tadalafil (generic Cialis) and vardenafil (generic Levitra) after a UK prescriber reviews your online consultation. Tadalafil is priced at £7.95 (or £6.36 for your first order with code Ednew), and vardenafil is £16.95 (or £13.56 with code Ednew). We also stock branded Cialis at £12.00 (£9.60 with Ednew) and other ED treatments. All require a prescription following clinical assessment.

Side Effects and Safety: Tadalafil vs Vardenafil

Both tadalafil and vardenafil share similar side effects because they work in the same way [4][5]. Common side effects include headache, flushing (redness or warmth in the face or chest), indigestion, nasal congestion, and dizziness. These are usually mild and temporary. Back pain and muscle aches are slightly more common with tadalafil, while visual disturbances (such as a blue tinge to vision) can occasionally occur with vardenafil [4][5].

Serious side effects are rare but require urgent medical attention. If you experience an erection lasting more than 4 hours (priapism), sudden loss of vision or hearing, or chest pain during sex, seek immediate help [4][5]. Both medicines can lower blood pressure, so they must never be taken with nitrates (such as GTN spray or isosorbide mononitrate), nicorandil, riociguat, or recreational drugs called 'poppers' (amyl or alkyl nitrites), as this combination can cause a dangerous drop in blood pressure [4][5].

If you take alpha-blockers (such as tamsulosin or doxazosin) for prostate symptoms or blood pressure, there is a risk of dizziness or low blood pressure when combined with PDE5 inhibitors [4][5]. You should be stable on the alpha-blocker before starting, and your prescriber will usually recommend the lowest dose of tadalafil or vardenafil. Certain medicines that affect liver enzymes (such as ritonavir, ketoconazole, or clarithromycin) can raise PDE5 inhibitor levels, requiring dose adjustments or avoidance [4][5]. Your prescriber will check all your current medicines during the consultation, and you should never stop or change a prescribed medicine without professional advice.

Who Should Not Take These Medicines?

Tadalafil and vardenafil are not suitable if you have recently had a heart attack or stroke, have unstable angina, severe heart failure, very low blood pressure, or a history of non-arteritic anterior ischaemic optic neuropathy (NAION, a type of sudden vision loss) [4][5]. Some inherited retinal disorders are also contraindications. Your prescriber will assess your suitability and discuss any concerns during your consultation [2].

Which Is Right for You: Tadalafil or Vardenafil?

There is no single 'best' option when comparing tadalafil vs vardenafil—the right choice depends on your individual circumstances, preferences, and medical history [2]. Tadalafil may suit you if you value a longer window of effectiveness (up to 36 hours) and prefer not to plan sexual activity too precisely around taking a tablet [4]. Its flexibility and reduced need for timing can feel more spontaneous for many men.

Vardenafil may be a better fit if you prefer a shorter duration of action (around 4 to 5 hours) and like the idea of a more 'on-demand' treatment that wears off relatively quickly [5]. Some men also find vardenafil works well for them if tadalafil has caused side effects, or vice versa, as individual responses can vary.

Both medicines are effective, well-studied, and widely used in the UK [2][4][5]. Your prescriber will consider factors such as your other health conditions, current medicines, how often you anticipate sexual activity, and any previous experience with ED treatments. If one option does not work well or causes side effects, it is often possible to try the other. At Cured Pharmacy, our UK-registered prescribers review every consultation individually to recommend the most suitable treatment for you. You can complete a confidential online consultation, and if approved, your medicine will be dispensed by our GPhC-registered pharmacy and delivered discreetly to your door.

Switching Between Treatments

If you have tried one PDE5 inhibitor and it has not worked as well as you hoped, or if you have experienced side effects, speak to your prescriber about trying a different one [2]. Some men respond better to tadalafil, others to vardenafil, and there are also other options such as sildenafil or avanafil. Your prescriber can guide you through the alternatives and adjust your treatment plan as needed.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 17 October 2026]
2. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 17 October 2026]
3. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 17 October 2026]
4. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 17 October 2026]

Information on this page is for educational purposes only and is not medical advice. Prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting or changing any medication.