How to Take Viagra: Official NHS Guidelines

Viagra (sildenafil) is a prescription treatment for erectile dysfunction that requires proper administration for safety and effectiveness. Understanding the correct dosage, timing, and precautions is essential before starting treatment. EverydayMeds provides both branded Viagra and generic sildenafil options following consultation with UK-licensed prescribers. This guide covers NHS-approved guidelines for taking Viagra safely and effectively.

  • Take 25-100mg approximately 30-60 minutes before sexual activity
  • Maximum one dose per 24-hour period - never exceed this limit
  • Avoid fatty meals which can delay the medication's effectiveness
  • Sexual stimulation is still required - Viagra doesn't cause automatic erections
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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 and Administration Guidelines

Starting Your Viagra Treatment

The typical starting dose for Viagra is 50mg, taken approximately one hour before sexual activity. Your prescriber may adjust this to 25mg if you experience side effects, or increase to 100mg if the initial dose proves insufficient. EverydayMeds offers both branded Viagra and generic sildenafil in all three strengths, allowing patients to choose their preferred option during checkout.

Timing and Food Considerations

Viagra should be taken 30-60 minutes before anticipated sexual activity. The medication can remain effective for 4-6 hours, though this doesn't mean erections will last this duration. Fatty meals can significantly delay absorption, so consider taking Viagra on an empty stomach or after a light meal for optimal results. Alcohol should be limited as it may reduce effectiveness and increase side effect risk.

Important Safety Guidelines

Never exceed one dose in 24 hours, regardless of effectiveness. Taking multiple doses can lead to dangerous drops in blood pressure. If you're taking nitrate medications for chest pain, do not use Viagra as this combination can be life-threatening. Always inform your prescriber about all medications, including over-the-counter drugs and supplements.

What to Expect

Viagra requires sexual arousal to work effectively - it doesn't automatically cause erections. Some men notice effects within 30 minutes, while others may need to wait up to an hour. If the medication doesn't work initially, don't take additional doses. Instead, consult your prescriber about adjusting the dosage or exploring alternative treatments.

When to Seek Medical Advice

Contact a healthcare professional immediately if you experience erections lasting more than 4 hours, sudden vision changes, or chest pain during sexual activity. Regular review with your prescriber ensures treatment remains appropriate and effective. EverydayMeds provides ongoing support through licensed UK pharmacists for all patients.

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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