Viagra vs Cialis: Comparing ED Treatment Options

When choosing between Viagra and Cialis for erectile dysfunction treatment, understanding their differences helps you make an informed decision. Both medications are effective PDE5 inhibitors that can help improve erectile function when sexually aroused. Viagra typically works within 30-60 minutes and lasts 4-6 hours, whilst Cialis offers longer duration of up to 36 hours. EverydayMeds provides both branded Viagra and cost-effective generic sildenafil options following a clinical consultation with our UK-licensed prescribers.

  • Viagra works faster (30-60 minutes) but has shorter duration (4-6 hours)
  • Cialis takes longer to work (30-120 minutes) but lasts up to 36 hours
  • Both require sexual arousal to be effective and need prescription consultation
  • Generic sildenafil offers the same active ingredient as Viagra at lower cost
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Not sure which one? Here's the honest comparison.

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

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.

Understanding Viagra and Cialis Key Differences

How Viagra and Cialis Work

Both Viagra (sildenafil) and Cialis (tadalafil) are PDE5 inhibitors that work by blocking the phosphodiesterase type 5 enzyme. This increases blood flow to the penis when you're sexually aroused, helping to achieve and maintain an erection. Neither medication causes automatic erections - sexual stimulation is still required for effectiveness.

Timing and Duration Comparison

Viagra typically begins working within 30-60 minutes of taking the tablet, with effects lasting 4-6 hours. Food, particularly fatty meals, may delay its onset. Cialis generally takes 30-120 minutes to become effective but provides a longer window of opportunity, with effects lasting up to 36 hours. This extended duration has earned Cialis the nickname "the weekend pill" among some users.

Dosage Options Available

Viagra is available in 25mg, 50mg, and 100mg strengths, with 50mg being the typical starting dose. Your prescriber may adjust this to 25mg if you experience side effects, or increase to 100mg if the initial dose isn't sufficiently effective. Cialis comes in 2.5mg, 5mg, 10mg, and 20mg tablets, with 10mg usually recommended as the starting dose for occasional use.

Side Effects and Tolerability

Both medications share similar side effects including headaches, flushing, indigestion, and nasal congestion. Some men find one medication more tolerable than the other. Viagra may cause more visual disturbances, whilst Cialis might lead to back pain or muscle aches in some users. These effects are generally mild and temporary.

Cost Considerations and Generic Options

Branded Viagra tends to be more expensive than branded Cialis per dose, though this varies by dosage strength. However, generic sildenafil provides significant cost savings compared to branded Viagra, containing exactly the same active ingredient. At EverydayMeds, patients can choose between branded Viagra or generic sildenafil during checkout, offering flexibility based on personal preference and budget.

Which Medication Might Suit You Better

If you prefer spontaneous intimacy with advance planning, Cialis's longer duration might be advantageous. For those who prefer taking medication closer to the time of sexual activity, Viagra's faster onset could be preferable. Some men find they respond better to one medication than the other, which is why trying both under medical supervision can help determine the most suitable option.

Safety and Medical Consultation

Both medications require prescription following consultation with a UK-licensed prescriber. This clinical assessment evaluates your cardiovascular health, current medications, and medical history to ensure safe prescribing. Neither medication should be taken with nitrates or by men with severe heart conditions, recent heart attacks, or strokes within six months.

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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