How to Take Viagra: Complete Dosage Guide

Viagra should be taken approximately 30-60 minutes before sexual activity, with the standard starting dose being 50mg once daily. This prescription medication requires proper timing and adherence to dosage guidelines for optimal effectiveness and safety. Understanding correct usage helps ensure you get the most benefit from your treatment while minimising potential side effects.

  • Take 50mg tablet 30-60 minutes before sexual activity
  • Maximum one dose per 24-hour period
  • Avoid fatty meals which may delay effectiveness
  • Sexual stimulation is still required for the medication to work
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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
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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.

Viagra Dosage Instructions and Safety Guidelines

Standard Viagra Dosing Protocol

Viagra is typically prescribed at a starting dose of 50mg, taken approximately 30-60 minutes before anticipated sexual activity. Your prescriber may adjust this to 25mg if you experience side effects, or increase to 100mg if the standard dose proves insufficient. It's crucial to take only one dose within any 24-hour period, regardless of the strength prescribed.

Timing Your Dose for Best Results

For optimal absorption, take Viagra on an empty stomach or after a light meal. Heavy, fatty foods can delay the medication's onset by up to two hours. The effects typically begin within 30-60 minutes and may last up to 4-6 hours, though this doesn't mean an erection will persist for this duration. Sexual arousal is still necessary for the medication to be effective.

What to Avoid When Taking Viagra

Never combine Viagra with nitrate medications such as GTN spray or isosorbide, as this can cause a dangerous drop in blood pressure. Limit alcohol consumption, as excessive drinking can reduce effectiveness and increase the risk of side effects. Grapefruit juice should also be avoided as it may affect how your body processes the medication.

Choosing Between Viagra and Sildenafil

EverydayMeds offers both branded Viagra and generic sildenafil at checkout. Both contain the same active ingredient (sildenafil citrate) and work identically, with the generic option typically being more cost-effective. Your choice between branded and generic is purely personal preference, as the clinical effectiveness remains the same.

Monitoring Your Response

Keep track of how well the medication works for you and any side effects experienced. Common mild side effects include headache, flushing, or indigestion. If you experience chest pain, sudden vision loss, or an erection lasting more than 4 hours, seek immediate medical attention. Your prescriber may adjust your dose based on your response and tolerability.

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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