What Will Viagra Do: Complete Dosage Guide

Viagra contains sildenafil citrate and is available in three dosage strengths: 25mg, 50mg, and 100mg tablets. Understanding the correct dosage is essential for safe and effective treatment of erectile dysfunction. Most men start with 50mg, which can be adjusted based on individual response and tolerability. EverydayMeds offers both branded Viagra and generic sildenafil options following a clinical consultation with our UK-licensed prescribers.

  • Standard starting dose is 50mg taken 30-60 minutes before sexual activity
  • Dosage can be increased to 100mg or reduced to 25mg based on effectiveness
  • Maximum of one tablet per 24-hour period regardless of strength
  • Both branded Viagra and generic sildenafil available in all three strengths
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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.

Viagra Dosage Strengths and Clinical Guidelines

Available Viagra Dosage Options

Viagra is manufactured in three distinct dosage strengths: 25mg, 50mg, and 100mg tablets. The active ingredient, sildenafil citrate, remains identical across all strengths, with only the concentration varying. Clinical guidelines typically recommend starting with 50mg for most adult men experiencing erectile dysfunction. This middle-strength option provides an effective balance between therapeutic benefit and minimal side effects for the majority of patients.

How Dosage Selection Works

Your prescriber will determine the appropriate starting dosage based on several factors including your overall health, current medications, and severity of erectile dysfunction symptoms. The 25mg strength is often prescribed for men who may be more sensitive to medications, those taking certain other medicines, or patients over 65 years of age. The 100mg strength may be considered if the 50mg dose proves insufficient, provided you tolerate the medication well and have no contraindications.

Timing and Administration Guidelines

Regardless of the dosage strength prescribed, Viagra should be taken approximately 30-60 minutes before anticipated sexual activity. The medication requires sexual stimulation to be effective and does not cause automatic erections. Effects typically last 4-6 hours, though this varies between individuals. Fatty meals may delay the onset of action, so consider taking on an empty stomach or after a light meal for optimal results.

Branded Viagra vs Generic Sildenafil

EverydayMeds provides both branded Viagra and generic sildenafil in all three dosage strengths. Both contain identical active ingredients and work in exactly the same way. Generic sildenafil offers a more cost-effective alternative while maintaining the same safety and efficacy profile as branded Viagra. Patients can choose their preferred option during the checkout process following a successful clinical consultation.

Safety Considerations and Adjustments

Dosage adjustments should only be made under medical supervision. Some patients may experience mild side effects such as headaches, facial flushing, or indigestion, particularly when starting treatment. These often diminish as your body adjusts to the medication. If side effects persist or become bothersome, your prescriber may recommend reducing the dosage to 25mg. Never exceed one tablet per 24-hour period, regardless of the strength prescribed.

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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