Viagra Tablet Dosage Strengths Available in UK

Viagra tablets are available in three different strengths in the UK: 25mg, 50mg, and 100mg. Understanding the correct dosage is essential for safe and effective treatment of erectile dysfunction. Most men start with the standard 50mg dose, which can be adjusted based on response and tolerability. EverydayMeds offers both branded Viagra and generic sildenafil options, allowing patients to choose based on their preference and budget during checkout.

  • 25mg - Lower strength for men who may experience side effects or have certain medical conditions
  • 50mg - Standard starting dose recommended for most men beginning ED treatment
  • 100mg - Maximum strength for men who don't achieve adequate results with lower doses
  • 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 Guide to Viagra Strengths and Dosing

Available Viagra Tablet Strengths

Viagra is manufactured in three distinct strengths: 25mg, 50mg, and 100mg tablets. Each strength contains the same active ingredient, sildenafil citrate, but in different concentrations to suit individual needs and medical circumstances.

25mg Viagra Tablets

The 25mg strength is typically prescribed for men who may be more sensitive to the medication or those taking certain other medicines that could interact with sildenafil. This lower dose may also be recommended for men over 65 years of age or those with liver or kidney problems. Whilst some men achieve satisfactory results with 25mg, others may find this dose insufficient for their needs.

50mg Viagra Tablets - Standard Dose

The 50mg tablet is the recommended starting dose for most men experiencing erectile dysfunction. Clinical studies have shown this strength to be effective for the majority of patients whilst maintaining a good safety profile. Men typically take their first dose at 50mg, and adjustments can be made based on how well it works and whether any side effects occur.

100mg Viagra Tablets - Maximum Strength

The 100mg tablet represents the maximum recommended dose of Viagra. This strength may be prescribed if the 50mg dose proves insufficient for achieving satisfactory erections. However, higher doses may increase the likelihood of experiencing side effects such as headaches, flushing, or dizziness. A healthcare provider will carefully assess whether the maximum dose is appropriate.

Branded Viagra vs Generic Sildenafil

At EverydayMeds, patients can choose between branded Viagra tablets manufactured by Pfizer or generic sildenafil tablets. Both contain identical active ingredients and are available in the same three strengths. Generic sildenafil offers a more cost-effective alternative whilst providing equivalent therapeutic benefits. The choice between branded and generic options is available during the checkout process.

Important Dosing Guidelines

Regardless of the strength prescribed, certain dosing rules must always be followed. Only one tablet should be taken within any 24-hour period, and the medication should be taken approximately 30-60 minutes before planned sexual activity. The effects may last up to 4-6 hours, though this doesn't mean an erection will persist for this duration. Sexual arousal is still required for the medication to work effectively.

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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