Viagra vs Cialis vs Levitra vs Spedra: The Complete Comparison

• Online consultation with UK-registered prescribers to find out which option suits you
• Registered UK pharmacy, with discreet and secure ordering
• A range of licensed treatment options, offered only where clinically appropriate
• All four compared properly, not just two with the others mentioned in passing

Viagra (sildenafil), Cialis (tadalafil), Levitra (vardenafil) and Spedra (avanafil) are the four PDE5 inhibitor tablets licensed for ED in the UK, and the main differences between them are how quickly they start working, how long they last, how food affects them and a few safety points: Spedra tends to act fastest, Cialis lasts longest, and Levitra has a specific heart-related caution. For adult men in the UK trying to work out which ED treatment best fits their health, routine and priorities, that comparison matters more than asking which one is simply "best".

They all work through the same underlying mechanism, but none is objectively right for everyone. The right choice depends on whether you want faster onset, a longer window of effect, fewer food restrictions, particular dosing options or a treatment that is appropriate for your medical history. This guide compares Viagra, Cialis, Levitra and Spedra across timing, duration, food effects, safety differences, effectiveness, dosing and the practical points a prescriber will consider, so you can make a more informed decision about which PDE5 inhibitor may suit you best.

Key things to know

• All four are PDE5 inhibitors requiring stimulation, but they block the enzyme PDE5 to sustain cGMP levels and support blood flow rather than causing an automatic erection.
• Spedra tends to have the fastest onset, Cialis lasts by far the longest, while Viagra and Levitra have shorter treatment windows.
• Food delays and lowers the peak level of all three short-acting options (Viagra, Levitra, Spedra) to varying degrees, and Cialis is the only genuinely food-independent one.
• Levitra carries a specific QT-interval caution the other three do not share, relevant to certain heart rhythm medicines.
• No trial has ever directly compared all four head-to-head, so claims that one is simply "more effective" than the others are not well supported

All Four Erectile Dysfunction Medications at a Glance

How Fast Each One Works

Spedra is generally the most fast-acting option, known for its rapid onset, typically within 30 to 45 minutes and licensed for use as little as 15 to 30 minutes beforehand.

Levitra also has a relatively rapid onset, typically 30 to 60 minutes.

Viagra is a little slower and more variable, generally 30 to 120 minutes with a median around 60.

Cialis can also begin working from around 30 minutes, although its much longer duration means exact onset timing may matter less in practice.

How Long Each One Lasts

This is where Cialis clearly stands apart: it is sometimes called the weekend pill because its duration of action can extend up to 36 hours. By contrast, Viagra, Levitra, and Spedra have a shorter duration than Cialis, even though their exact effect windows can vary between men.

Food Interaction: A More Nuanced Picture Than the Marketing Suggests

A high-fat meal affects all three short-acting options by delaying absorption and reducing peak concentrations to varying degrees, although they can still be taken with food.

Viagra's absorption is delayed by around 60 minutes with peak concentration reduced by around 29%. Spedra's delay is somewhat longer, around 75 minutes, with peak concentration reduced by around 39%, though the total amount eventually absorbed is not meaningfully reduced, food mainly shifts and flattens the peak rather than blocking absorption outright. Levitra's food effect is comparatively milder in relative terms, a high-fat meal delays absorption by around an hour with a smaller reduction in peak concentration (around 18-20%), and a moderate-fat meal has little clinically relevant effect at all. Cialis remains the clear exception: it is genuinely and substantially food-independent. If avoiding meal-timing planning matters to you specifically, that is a real, evidenced reason Cialis may suit you better than any of the other three.

The Specific Side Effects and Safety Differences Worth Knowing

Beyond the shared, absolute contraindication with nitrate medicines that applies to all four, each has one distinctive consideration worth being aware of. Cialis, because it also affects a different enzyme (PDE11) alongside PDE5, is specifically associated with back pain and muscle aches in a minority of men, typically appearing 12 to 24 hours after taking it. Levitra carries a specific caution around QT-interval prolongation, a heart rhythm consideration relevant if you take certain antiarrhythmic medicines or have a related heart condition, which is not a shared feature of the other three. Viagra and Spedra do not carry either of these specific additional cautions, though all four share a profile of common side effects that are generally mild and usually temporary, including headache, facial flushing and nasal congestion. Viagra can also cause visual disturbances, while Spedra may cause nausea or skin rash in some users. Check the patient information leaflet for full side effects details. Rare serious side effects include priapism, a prolonged erection, a sudden decrease in vision needs urgent medical attention.

Is One Actually More Effective Than the Others?

This is genuinely difficult to answer with confidence, and it is worth being honest about why. Clinical trials show that both Viagra and Spedra are effective treatments for erectile dysfunction, but the available studies do not provide a reliable direct comparison of their effectiveness.

There is no established direct head-to-head evidence showing that avanafil reliably outperforms sildenafil, tadalafil or vardenafil.

Claims that one specific option is simply "the most effective" are not well supported by genuine head-to-head evidence, whatever marketing sometimes implies.

Dosing Structure

Viagra is commonly available at 25mg, 50mg and 100mg, and its active ingredient is sildenafil.

Spedra comes in 50mg, 100mg and 200mg, with 100mg the usual starting point.

Levitra is available at 5mg, 10mg and 20mg.

Viagra, Spedra and Levitra are taken as needed before sexual activity, with the dose adjusted by a prescriber according to individual response.

Cialis offers this same as-needed structure, but also a genuinely different low daily dose option, with lower doses available for the daily option, which can reduce the need to plan around a specific occasion.

Which Might Suit You Best

Choosing the right treatment among these four medications for erectile dysfunction often comes down to a few practical priorities. If speed matters most, Spedra or Levitra are the faster-acting choices.

If you would rather not think about meal timing at all, or want a much wider window than a single occasion, Cialis is the clearest fit, including its daily option.

Some men may prefer Cialis because of its longer treatment window, while others may prefer a shorter-acting option depending on how they respond.

If you have a relevant heart rhythm consideration, this is specifically worth raising with a prescriber when Levitra is being considered.

And if you would simply rather use the most widely recognised, longest-established option, Viagra fits that. None of these reasons are mutually exclusive, and a proper assessment weighs them against your actual health rather than preference alone.

How a Prescriber Weighs Up All Four

An assessment of these oral medications and ED treatments typically covers your general health, medical history and any other medications you take, because suitability can vary, particularly if you have heart conditions, relevant medicine interactions or other underlying health conditions.

It also checks for medicines such as alpha blockers and nitrate-containing recreational drugs such as amyl nitrite, because these can affect blood pressure and may interact with PDE5 inhibitors. There is no default option that suits everyone, which is why this is a genuine individual decision rather than a simple recommendation.

A Note on Cost

Pricing varies by drug, strength, quantity, and whether you choose an as-needed or daily option, so it is worth checking current, standard pricing directly rather than assuming any one of the four is reliably cheapest. Comparing cost against your realistic pattern of use, occasional vs regular, as-needed vs daily, tends to be more useful than comparing price per tablet alone.

Switching or Combining

Switching between ed medications or other ed treatments, with a prescriber's guidance, is sometimes needed when the first medication does not suit you, since individual response varies in ways that are not fully predictable from the general profile of each drug. Some patients do not respond well to oral treatment and may need other treatments. Taking more than one of the four together, or close together, is not advised, since they all work through the same pathway and combining any two adds risk without proven added benefit.