Viagra Online UK: Key Clinical Information

Viagra (sildenafil) is a prescription medication for erectile dysfunction, available through EverydayMeds following clinical consultation. This PDE5 inhibitor increases blood flow when sexually aroused, typically working within 30-60 minutes. Available in 25mg, 50mg, and 100mg strengths, patients can choose between branded Viagra or generic sildenafil at checkout. Maximum one dose per 24 hours. Clinical assessment ensures suitability and safety.

  • Prescription required following online consultation with UK prescriber
  • Available as branded Viagra or generic sildenafil (same active ingredient)
  • Works within 30-60 minutes, effects may last 4-6 hours
  • Three strengths available: 25mg, 50mg, 100mg tablets
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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
Explore now
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
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.

Clinical Information and Prescribing Guidelines

How Viagra Works

Viagra contains sildenafil citrate, a PDE5 inhibitor that blocks the phosphodiesterase type 5 enzyme. This mechanism increases blood flow to the penis during sexual arousal. Importantly, Viagra does not cause automatic erections - sexual stimulation remains necessary for the medication to be effective.

Dosage and Administration

The standard starting dose is 50mg, taken approximately 30-60 minutes before sexual activity. Based on individual response and tolerability, your prescriber may adjust this to 25mg or increase to a maximum of 100mg. Only one dose should be taken within any 24-hour period. Food, particularly fatty meals, may delay the onset of action.

Branded vs Generic Options

EverydayMeds offers both Viagra (branded by Pfizer) and sildenafil (generic version) at checkout. Both contain the same active ingredient and work identically. The generic sildenafil provides a more cost-effective option whilst maintaining the same clinical efficacy and safety profile as branded Viagra.

Eligibility and Safety Considerations

Viagra is suitable for adult men over 18 experiencing erectile dysfunction. Our clinical assessment evaluates cardiovascular health, current medications, and medical history to ensure safe prescribing. Men taking nitrates (GTN spray, isosorbide) cannot use Viagra due to dangerous blood pressure interactions. Those with severe heart disease, recent stroke, or very low blood pressure require careful evaluation.

Expected Effects and Duration

Most men experience improved erectile function within 30-60 minutes of taking Viagra. The effects may last 4-6 hours, though this does not mean an erection persists for this duration. The medication enhances natural erectile response to sexual stimulation during this timeframe.

Prescription Process

UK law requires a prescription for Viagra and sildenafil. Our online consultation involves completing a detailed medical questionnaire reviewed by a UK-licensed prescriber. This ensures the medication is clinically appropriate and safe based on your individual health profile and current medications.

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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