Sildenafil Citrate: Complete UK Treatment Guide

Sildenafil citrate is the active ingredient in both branded Viagra and generic sildenafil tablets for erectile dysfunction treatment. This comprehensive checklist covers everything you need to know about sildenafil citrate, including dosages, eligibility criteria, and safety considerations. EverydayMeds offers both branded Viagra and cost-effective generic sildenafil options following online consultation with UK-licensed prescribers.

  • Available as branded Viagra or generic sildenafil with identical active ingredients
  • Prescription-only medicine requiring clinical assessment by UK-licensed prescriber
  • Three dosage strengths: 25mg, 50mg, and 100mg tablets
  • Works within 30-60 minutes and effects may last 4-6 hours
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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 Citrate Treatment Essentials

How Sildenafil Citrate Works

Sildenafil citrate functions as a PDE5 inhibitor, blocking the phosphodiesterase type 5 enzyme to increase blood flow to the penis during sexual arousal. The medication does not cause automatic erections - sexual stimulation remains necessary for effectiveness. Both branded Viagra and generic sildenafil contain identical sildenafil citrate, with generic options typically offering more cost-effective treatment.

Dosage and Administration Guidelines

Sildenafil citrate is available in 25mg, 50mg, and 100mg strengths. Most men start with 50mg, taken 30-60 minutes before sexual activity. Dosage may be adjusted to 25mg if side effects occur, or increased to 100mg if 50mg proves insufficient. Only one dose should be taken within 24 hours. Fatty meals may delay the medication's onset, so taking on an empty stomach may improve effectiveness.

Eligibility and Safety Requirements

Adult men experiencing erectile dysfunction may be suitable for sildenafil citrate following clinical assessment. UK-licensed prescribers evaluate cardiovascular health, current medications, and medical history before prescribing. The medication is contraindicated for men taking nitrates, those with severe heart conditions, recent heart attack or stroke within six months, or severe liver impairment. Dangerous interactions occur with nitrates and riociguat medications.

Choosing Between Branded and Generic Options

EverydayMeds offers both branded Viagra and generic sildenafil citrate options at checkout, allowing patients to choose based on preference and budget. Generic sildenafil contains the same active ingredient and undergoes rigorous quality testing, providing equivalent effectiveness at lower cost. Branded Viagra may be preferred by some patients for familiarity and brand recognition.

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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