British Viagra Dosage Strengths and Guidelines

Viagra is available in three dosage strengths in the UK: 25mg, 50mg, and 100mg tablets. The starting dose is typically 50mg, taken 30-60 minutes before sexual activity. Your prescriber may adjust this to 25mg or 100mg based on effectiveness and how well you tolerate the medication. At EverydayMeds, you can choose between branded Viagra or generic sildenafil at checkout, both containing the same active ingredient.

  • 25mg tablets - Lower starting dose for men with health conditions or those experiencing side effects
  • 50mg tablets - Standard recommended starting dose for most men with erectile dysfunction
  • 100mg tablets - Maximum dose, only prescribed if 50mg proves insufficient
  • Maximum one tablet per 24-hour period regardless of strength chosen
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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.

Complete Dosage Information for British Viagra

Available Viagra Dosage Strengths

British Viagra comes in three distinct tablet strengths: 25mg, 50mg, and 100mg. Each strength contains the active ingredient sildenafil citrate in different concentrations. The 50mg dose represents the standard starting point for most men seeking treatment for erectile dysfunction. Healthcare providers may recommend the 25mg strength for patients with certain medical conditions or those prone to side effects, whilst the 100mg option serves as the maximum allowable dose.

Determining Your Optimal Dosage

Your prescriber will recommend an initial Viagra dosage based on your medical history, current medications, and overall health status. The 50mg tablet typically provides effective results for most patients whilst minimising potential side effects. If this proves insufficient, your healthcare provider may increase the dose to 100mg. Conversely, if you experience bothersome side effects, reduction to 25mg may be appropriate. Never adjust your dosage without consulting your prescriber first.

Timing and Administration Guidelines

Take your prescribed Viagra dose 30-60 minutes before planned sexual activity. The medication requires sexual stimulation to be effective and does not cause automatic erections. Avoid taking Viagra with fatty meals, as this can delay the onset of action. The effects may last 4-6 hours, though this varies between individuals. Remember that only one tablet should be taken within any 24-hour period, regardless of strength.

Branded Viagra vs Generic Sildenafil Options

EverydayMeds offers both branded Viagra manufactured by Pfizer and generic sildenafil alternatives. Both contain identical active ingredients in the same dosage strengths and work in exactly the same way. The choice between branded and generic options often comes down to personal preference and cost considerations. Generic sildenafil provides a more economical alternative whilst maintaining the same clinical effectiveness and safety profile as branded Viagra.

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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