Viagra Dosage Strengths: Complete UK Guide

Looking for reliable information about Viagra dosages? EverydayMeds offers Viagra in three strengths: 25mg, 50mg, and 100mg tablets. Our UK-licensed prescribers will determine the most appropriate dose during your online consultation. We also provide sildenafil (the generic equivalent) as a cost-effective alternative. Both options require a prescription following a clinical assessment to ensure your safety and treatment effectiveness.

  • Available in 25mg, 50mg, and 100mg tablet strengths
  • Starting dose typically 50mg, adjustable based on response
  • Maximum one dose per 24-hour period
  • Generic sildenafil option available at lower cost
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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.

Understanding Viagra Dosage Options at EverydayMeds

Available Dosage Strengths

Viagra is available in three standardised strengths: 25mg, 50mg, and 100mg tablets. The 50mg dose serves as the standard starting point for most patients, as recommended by MHRA guidance. Our prescribers may adjust this to 25mg for those requiring a lower dose due to tolerability concerns, or increase to 100mg for patients who may benefit from a higher strength. EverydayMeds stocks all three strengths to ensure personalised treatment.

Determining Your Appropriate Dose

During your online consultation, our UK-licensed prescribers will evaluate several factors to determine your optimal dosage. These include your medical history, current medications, cardiovascular health, and any previous experience with ED treatments. Age and liver function may also influence dosing decisions. The clinical assessment ensures you receive the most suitable strength whilst minimising potential side effects.

Viagra vs Sildenafil: Your Choice

At checkout, patients can choose between branded Viagra and generic sildenafil. Both contain the identical active ingredient (sildenafil citrate) in the same strengths and work in exactly the same way. The generic option typically costs significantly less whilst providing equivalent therapeutic benefits. This choice allows patients to select the option that best suits their preferences and budget requirements.

Dosing Guidelines and Safety

Regardless of strength chosen, take only one tablet within any 24-hour period. Viagra should be taken approximately 30-60 minutes before anticipated sexual activity. The effects may last 4-6 hours, though this doesn't mean an erection will persist - sexual stimulation remains necessary. Avoid fatty meals before taking your dose, as this may delay the medication's onset of action.

When Dose Adjustment May Be Needed

Your prescriber might recommend starting with 25mg if you're over 65, have liver problems, or take certain medications. Conversely, if the 50mg dose proves insufficient, increasing to 100mg may be considered. Never adjust your dose without consulting your prescriber first. EverydayMeds provides ongoing support to ensure your treatment remains effective and appropriate for your needs.

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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