How to Take Sildenafil: MHRA Approved Usage Guide

Sildenafil is an effective prescription treatment for erectile dysfunction, available as both branded Viagra and generic sildenafil. Understanding proper usage is essential for safety and effectiveness. This guide covers MHRA-approved dosing, timing, and important safety considerations. EverydayMeds offers both branded and generic options following consultation with our UK-licensed prescribers, allowing patients to choose their preferred treatment option.

  • Take one tablet 30-60 minutes before sexual activity
  • Starting dose is typically 50mg, adjustable between 25mg-100mg
  • Maximum one dose per 24-hour period
  • Avoid fatty meals which may delay effectiveness
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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.

Sildenafil Dosing Schedule and Administration

Standard Dosing Guidelines

The recommended starting dose of sildenafil is 50mg, taken approximately one hour before sexual activity. Based on effectiveness and tolerability, the dose may be adjusted to 25mg or increased to a maximum of 100mg. It's crucial to never exceed one dose within a 24-hour period, regardless of the strength prescribed.

Timing and Food Considerations

Sildenafil should be taken 30-60 minutes before anticipated sexual activity. The medication works most effectively on an empty stomach or after a light meal. Heavy or fatty meals can significantly delay the onset of action, potentially reducing effectiveness. Alcohol should be limited as it may impair the ability to achieve an erection.

How Sildenafil Works

Sildenafil belongs to a class of medications called PDE5 inhibitors. It works by increasing blood flow to the penis during sexual arousal. It's important to understand that sexual stimulation is still required - the medication doesn't cause automatic erections. Effects typically last 4-6 hours, though this doesn't mean an erection will persist throughout this period.

Choosing Between Branded and Generic

Both Viagra (branded) and generic sildenafil contain the same active ingredient and work identically. The choice often comes down to personal preference and cost considerations. EverydayMeds offers both options following consultation, allowing patients to select their preferred treatment. Generic sildenafil provides the same therapeutic benefits at a lower cost.

Safety Considerations

Before taking sildenafil, ensure you've disclosed all current medications and medical conditions during your consultation. Never combine sildenafil with nitrate medications used for chest pain, as this can cause dangerous drops in blood pressure. If you experience chest pain, dizziness, or prolonged erections lasting more than four hours, seek immediate medical attention.

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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