Viagra Dosage Strengths & Duration Guide

Viagra is available in three dosage strengths (25mg, 50mg, 100mg) with effects typically lasting 4-6 hours. Understanding the right dosage and duration helps optimise treatment for erectile dysfunction. EverydayMeds offers both branded Viagra and generic sildenafil options following an online consultation with UK-licensed prescribers. The choice between branded or generic versions is available at checkout.

  • Viagra comes in 25mg, 50mg, and 100mg tablet strengths
  • Effects typically last 4-6 hours after taking a dose
  • Standard starting dose is usually 50mg, taken 30-60 minutes before activity
  • Maximum one tablet per 24-hour period regardless of strength
Start your free consultation

Takes less than 2 minutes to complete, 100% online

Your sexual health treatments, all online and made simple.

More pleasure. Less waiting. Built to last.

Get Started

Not sure which one? Here's the honest comparison.

Sildenafil
~60 min
~4 hrs
you like to plan ahead
Explore now
Tadalafil (as-needed)Most prescribed
~30 min
up to 36 hrs
you want a whole weekend covered
Explore now
Tadalafil Daily
always active
continuous
you never want to think about timing
Explore now
Vardenafil
~15–30 min
~8 hrs
you want the fastest onset
Explore now

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 Strengths & Timing

Available Viagra Dosage Strengths

Viagra tablets are manufactured in three strengths: 25mg, 50mg, and 100mg. The 50mg dose serves as the standard starting point for most patients. Your prescriber may adjust this to 25mg if you experience side effects or to 100mg if the standard dose proves insufficient. EverydayMeds stocks both branded Viagra and generic sildenafil in all three strengths, allowing patients to choose their preferred option during checkout.

How Long Viagra Effects Last

Viagra's effects typically last between 4-6 hours after taking a tablet. This timeframe refers to the window during which the medication can help achieve erections when sexually aroused, not continuous erection duration. The medication begins working within 30-60 minutes of ingestion, with peak effectiveness occurring around 1-2 hours after taking the dose.

Factors Affecting Duration

Several factors may influence how long Viagra remains effective in your system. Age, overall health, liver function, and other medications can impact duration. Fatty meals consumed before taking Viagra may delay its onset but don't significantly affect total duration. Alcohol consumption can reduce effectiveness and should be limited when using this medication.

Dosage Guidelines & Safety

Never exceed one Viagra tablet within any 24-hour period, regardless of strength. Taking the medication 30-60 minutes before planned sexual activity provides optimal timing. If the 50mg starting dose proves inadequate, consult your prescriber about adjusting to 100mg rather than taking additional tablets. The 25mg strength is typically reserved for patients who experience side effects with higher doses.

Choosing Between Branded & Generic

Both Viagra and generic sildenafil contain the same active ingredient (sildenafil citrate) and work identically. The main difference lies in cost, with generic versions typically being more affordable. EverydayMeds provides both options following your online consultation, allowing you to make an informed choice based on your preferences and budget.

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.
Couple laughing together

How it works

Achieve your goals in just a few simple steps.

Step 1

Start Free Consultation

Select safe UK treatments. Quick answers.

Step 2

Review By Our Clinical Team

Our expert team will use your consultation as the basis of our recommendation and communicate with you.

Step 3

Get it delivered fast

We’ll deliver direct to you, as quickly as tomorrow.

Frequently asked questions