Viagra Dosage Strengths: Complete UK Guide

Viagra is available in three dosage strengths: 25mg, 50mg, and 100mg tablets. Most men start with 50mg, taken approximately one hour before sexual activity. Your prescriber may adjust your dose based on how well it works and any side effects experienced. EverydayMeds offers both branded Viagra and generic sildenafil, allowing you to choose the option that suits your preferences and budget during checkout.

  • Standard starting dose is 50mg, taken 30-60 minutes before sexual activity
  • Dose can be increased to 100mg or reduced to 25mg based on response
  • Maximum one tablet per 24-hour period regardless of strength
  • Both branded Viagra and generic sildenafil available in all three strengths
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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.

How Viagra Dosage Strengths Work for Different Needs

Understanding Viagra Dosage Options

Viagra contains sildenafil citrate as its active ingredient and comes in three carefully formulated strengths. The 50mg dose serves as the recommended starting point for most men, as clinical trials have shown this provides an effective balance between efficacy and tolerability. Your healthcare provider will determine the most appropriate dose during your consultation.

25mg Viagra: Lower Strength Option

The 25mg strength may be prescribed if you experience side effects with higher doses or have certain health conditions that require a more cautious approach. Men taking certain medications that interact with sildenafil may also be prescribed this lower dose. Despite being the lowest strength, 25mg can still be effective for many men with erectile dysfunction.

50mg Viagra: Standard Starting Dose

This represents the most commonly prescribed initial dose. Clinical studies indicate that 50mg is effective for the majority of men while maintaining a favourable side effect profile. If you're new to erectile dysfunction treatment, your prescriber will likely recommend starting with this strength to assess your individual response.

100mg Viagra: Maximum Dose

The 100mg tablet is the highest available dose and may be prescribed if 50mg proves insufficient. However, higher doses increase the likelihood of side effects such as headaches, flushing, or dizziness. Your prescriber will only recommend increasing to 100mg if the potential benefits outweigh the risks for your specific situation.

Choosing Between Viagra and Sildenafil

EverydayMeds provides both options in all three strengths. Branded Viagra and generic sildenafil contain identical active ingredients and work in exactly the same way. The choice often comes down to personal preference and cost considerations, as generic sildenafil typically costs less than the branded version.

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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