Viagra vs Cialis: Complete Comparison Guide

When comparing ED treatments, understanding the differences between Viagra and Cialis helps you make an informed choice. Both are effective PDE5 inhibitors but differ in duration, onset time, and cost. Viagra (sildenafil) works for 4-6 hours, while Cialis (tadalafil) can last up to 36 hours. EverydayMeds offers both branded Viagra and generic sildenafil options, allowing you to choose based on your preferences and budget through our UK-licensed prescription service.

  • Viagra works within 30-60 minutes and lasts 4-6 hours
  • Cialis takes 30 minutes to work but can last up to 36 hours
  • Generic sildenafil offers the same effectiveness as Viagra at lower cost
  • Both require prescription following clinical assessment by UK-licensed prescribers
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Not sure which one? Here's the honest comparison.

Sildenafil
~60 min
~4 hrs
you like to plan ahead
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Tadalafil (as-needed)Most prescribed
~30 min
up to 36 hrs
you want a whole weekend covered
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Tadalafil Daily
always active
continuous
you never want to think about timing
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Vardenafil
~15–30 min
~8 hrs
you want the fastest onset
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How ED treatment works in your body.

Increases blood flow

Increases blood flow

When PDE5 is suppressed, blood is able to flow more freely through the body—including to the (you guessed it) penis.

Increase erections

Increase erections

More blood flow to the penis means harder, more satisfying erections once you're sexually stimulated.

Cost Comparison: Viagra vs Cialis vs Generic Options

Duration and Timing Differences

The most significant difference between Viagra and Cialis lies in how long they remain effective. Viagra (sildenafil) typically works for 4-6 hours, making it suitable for planned sexual activity. Cialis (tadalafil) can remain effective for up to 36 hours, earning it the nickname "the weekend pill" and offering more spontaneity.

Viagra Tablet Cost Considerations

Viagra tablet cost varies depending on whether you choose the branded version or generic sildenafil. At EverydayMeds, patients can select between Viagra (branded by Pfizer) and sildenafil (generic) during checkout. Both contain the same active ingredient - sildenafil citrate - but generic versions typically cost significantly less while providing identical effectiveness. This allows patients to prioritise either brand recognition or cost savings based on their preferences.

Effectiveness and Side Effects

Both medications work as PDE5 inhibitors, increasing blood flow to the penis when sexually aroused. Clinical studies show similar effectiveness rates, with approximately 70-85% of men experiencing improved erections. Common side effects include headaches, flushing, indigestion, and nasal congestion. These effects are generally mild and temporary, occurring more frequently when starting treatment.

Food and Alcohol Interactions

Viagra can be affected by food, particularly fatty meals, which may delay its onset. Cialis is less affected by food intake, making it more flexible for meal planning. Both medications can interact with alcohol, potentially increasing side effects and reducing effectiveness. Moderate alcohol consumption is generally acceptable, but excessive drinking should be avoided.

Choosing Between Options

Your choice may depend on lifestyle factors and cost considerations. If you prefer planned intimacy and want to minimise costs, generic sildenafil might be ideal. For spontaneous activity over longer periods, Cialis could be more suitable despite higher costs. Some men try both medications under medical supervision to determine which works best for their situation.

Prescription Requirements

Both Viagra and Cialis are prescription-only medicines in the UK, requiring consultation with qualified healthcare providers. EverydayMeds' clinical team assesses your medical history, current medications, and cardiovascular health before prescribing. This ensures safe, appropriate treatment tailored to your individual circumstances and helps identify any contraindications or potential drug interactions.

What you need to know about erectile dysfunction

It's one of the most common conditions we treat, and one of the most treatable.

What is Erectile Dysfunction?
ED means finding it hard to get or keep an erection firm enough for sex. It's not unusual to have an off night; the point at which it's worth doing something is when it's happening regularly, or when it's starting to bother you.
How will I feel when I take ED medication?
For most men, nothing feels different day to day. The medication works in the background — when you're sexually aroused, it helps blood flow where it's needed, so erections come more easily and last longer. It doesn't cause arousal on its own. Some men notice mild, short-lived effects like a headache, facial flushing or a stuffy nose, which usually pass as the dose wears off.
Why do I need a prescription for ED medication?
ED treatments are prescription-only medicines in the UK because they aren't suitable for everyone — for example, alongside certain heart conditions or medications like nitrates. That's why we ask you to complete a short online consultation first. A UK-registered prescriber reviews your answers to make sure your chosen treatment is safe and right for you before it's dispensed.
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