Viagra Dosage Strengths: Complete UK Guide

Understanding Viagra dosage options is essential for effective ED treatment. Available in 25mg, 50mg, and 100mg strengths, the starting dose is typically 50mg, taken 30-60 minutes before sexual activity. EverydayMeds offers both branded Viagra and generic sildenafil options following online consultation with UK-licensed prescribers. Maximum one dose per 24 hours, with adjustments based on individual response and tolerability.

  • 25mg - Lower strength for reduced side effects or certain medical conditions
  • 50mg - Standard starting dose recommended for most men
  • 100mg - Maximum strength when 50mg proves insufficient
  • Generic sildenafil available as cost-effective alternative to branded Viagra
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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.

How to Choose the Right Viagra Strength

Starting Dose Guidelines

The recommended starting dose for Viagra is 50mg, taken approximately one hour before sexual activity. This strength provides optimal effectiveness for most men while minimising potential side effects. Your prescriber may recommend starting with 25mg if you have certain medical conditions, are over 65, or take medications that may interact with sildenafil.

Adjusting Your Dosage

Based on effectiveness and tolerability, your dose may be increased to 100mg or decreased to 25mg. The 100mg strength represents the maximum recommended dose and should only be used when 50mg proves insufficient. Never exceed one tablet per 24-hour period, regardless of strength chosen.

Viagra vs Generic Sildenafil

EverydayMeds provides both branded Viagra and generic sildenafil at checkout. Both contain identical active ingredients and work in exactly the same way. Generic sildenafil offers significant cost savings while maintaining the same clinical effectiveness, safety profile, and dosage options as branded Viagra.

Taking Your Medication Correctly

Take your prescribed dose 30-60 minutes before anticipated sexual activity. Avoid heavy or fatty meals beforehand as these may delay the medication's onset. Sexual stimulation is still required - sildenafil enhances natural erectile response rather than causing automatic erections.

When to Consult Your Prescriber

Contact your healthcare provider if your current dose becomes less effective, you experience troublesome side effects, or your medical circumstances change. Regular reviews ensure your treatment remains appropriate and effective. Never adjust dosages without professional guidance.

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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