Viagra Key Information: Quick Reference Guide

Get essential facts about Viagra (sildenafil) for erectile dysfunction treatment. This quick reference covers dosage, how it works, eligibility requirements, and important safety information. EverydayMeds offers both branded Viagra and generic sildenafil options following online consultation with UK-licensed prescribers. All treatments require clinical assessment to ensure safe and appropriate use.

  • Available in 25mg, 50mg and 100mg tablets - typical starting dose is 50mg
  • Works within 30-60 minutes, effects may last 4-6 hours
  • Requires sexual arousal to be effective - does not cause automatic erection
  • Maximum one dose per 24-hour period with prescription following consultation
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Not sure which one? Here's the honest comparison.

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

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.

Complete Viagra Treatment Information

How Viagra Works

Viagra contains sildenafil citrate, a PDE5 inhibitor that increases blood flow to the penis when sexually aroused. It blocks the phosphodiesterase type 5 enzyme, helping maintain an erection suitable for sexual activity. The medication requires sexual stimulation to be effective and does not cause automatic erections.

Dosage and Administration

Viagra is available in three strengths: 25mg, 50mg, and 100mg tablets. Most men start with 50mg, taken approximately one hour before sexual activity. Your prescriber may adjust the dose to 25mg or 100mg based on effectiveness and how well you tolerate the treatment. Take only one dose within any 24-hour period. Fatty meals may delay the medication's onset of action.

Eligibility Requirements

Viagra requires a prescription following consultation with a UK-licensed healthcare professional. You must be an adult male experiencing erectile dysfunction and complete a clinical assessment covering your medical history, current medications, and cardiovascular health. The treatment is not suitable for women or men under 18 years of age.

Important Safety Information

Never take Viagra if you use nitrate medications (GTN spray, isosorbide) as this combination can cause dangerous drops in blood pressure. The medication is also unsuitable for men with severe heart disease, recent heart attack or stroke, severe liver problems, or very low blood pressure. Always inform your prescriber about all medications you currently take.

Viagra vs Sildenafil Options

EverydayMeds offers both branded Viagra (manufactured by Pfizer) and generic sildenafil containing the same active ingredient. Both medications work identically - the choice between branded and generic options depends on personal preference and budget considerations. Your prescriber can help determine the most suitable option during your consultation.

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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