Viagra Dosage Strengths: Complete UK Guide

Viagra is available in three dosage strengths: 25mg, 50mg, and 100mg tablets. The standard starting dose is typically 50mg, taken approximately one hour before sexual activity. Your prescriber may adjust this to 25mg or 100mg based on your response and tolerability. EverydayMeds offers both branded Viagra and generic sildenafil options during checkout, giving you flexibility in your treatment choice.

  • 25mg - Lower starting dose for those with medical conditions or taking certain medications
  • 50mg - Standard recommended starting dose for most men
  • 100mg - Maximum strength for those who need a higher dose
  • 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.

How to Choose the Right Viagra Dosage Strength

Understanding Viagra Dosage Options

Viagra (sildenafil citrate) is available in three carefully regulated strengths: 25mg, 50mg, and 100mg tablets. Each strength contains the same active ingredient but in different concentrations to meet individual treatment needs. During your consultation, a UK-licensed prescriber will determine the most appropriate starting dose based on your medical history, current medications, and overall health status.

25mg Viagra Tablets

The 25mg strength is typically prescribed as a starting dose for men who may be more sensitive to the medication or those taking certain medications that could interact with sildenafil. This lower dose is also recommended for men over 65 years of age or those with liver or kidney problems. Despite being the lowest strength, 25mg can still be effective for many men experiencing erectile dysfunction.

50mg Viagra Tablets - Standard Starting Dose

The 50mg tablet represents the standard recommended starting dose for most men. Clinical studies have shown this strength to be effective for the majority of patients whilst maintaining a good tolerability profile. Most prescribers will begin treatment with 50mg, then adjust the dose based on your response and any side effects experienced. This strength offers a balanced approach to treatment.

100mg Viagra Tablets - Maximum Strength

The 100mg tablet is the highest strength available and is typically prescribed when lower doses have proven insufficient. This maximum dose should only be used under medical supervision and is not suitable for everyone. Men taking 100mg tablets should be particularly aware of potential side effects and drug interactions, as these may be more pronounced at higher doses.

Choosing Between Viagra and Generic Sildenafil

At EverydayMeds, you can choose between branded Viagra and generic sildenafil tablets during checkout. Both contain the same active ingredient (sildenafil citrate) and are available in identical strengths. The generic version offers a more cost-effective option whilst maintaining the same clinical effectiveness. Your choice between branded and generic is purely personal preference, as both undergo the same rigorous quality standards.

Important Dosage Guidelines

Regardless of which strength is prescribed, never take more than one tablet in a 24-hour period. Viagra should be taken approximately 30-60 minutes before planned sexual activity, and its effects may last up to 4-6 hours. Taking the medication with a large or fatty meal may delay its onset of action. Always follow your prescriber's specific instructions regarding timing and dosage.

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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