Sildenafil Tablet Quick Reference Guide

Sildenafil tablets are the generic version of Viagra, containing the same active ingredient at a lower cost. Available in 25mg, 50mg, and 100mg strengths, sildenafil works by increasing blood flow to help treat erectile dysfunction. EverydayMeds offers both sildenafil generic and branded Viagra options, allowing patients to choose their preferred treatment following an online consultation with our UK-licensed prescribers.

  • Works within 30-60 minutes when sexually aroused
  • Effects may last 4-6 hours (not continuous erection)
  • Standard starting dose is 50mg, taken once daily maximum
  • Same active ingredient as Viagra but more cost-effective
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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.

How Sildenafil Works and Treatment Information

Understanding Sildenafil Tablets

Sildenafil is a PDE5 inhibitor that works by blocking the phosphodiesterase type 5 enzyme, which increases blood flow to the penis during sexual arousal. It's important to understand that sildenafil does not cause automatic erections - sexual stimulation is still required for the medication to be effective.

Dosage and Administration

Sildenafil tablets are available in three strengths: 25mg, 50mg, and 100mg. Most patients start with the 50mg dose, which can be adjusted based on effectiveness and tolerability. The medication should be taken 30-60 minutes before sexual activity, with a maximum of one dose per 24-hour period. Fatty meals may delay the onset of action, so consider taking on an empty stomach for faster results.

Who Can Take Sildenafil

Sildenafil is suitable for adult men over 18 experiencing erectile dysfunction. However, it requires a prescription following consultation with a UK-licensed prescriber who will assess your cardiovascular health, current medications, and medical history. The treatment is not suitable for women or those under 18 years of age.

Important Safety Considerations

Sildenafil should never be taken with nitrates (such as GTN spray or isosorbide), as this combination can cause dangerous drops in blood pressure. It's also contraindicated in men with severe heart disease, recent heart attack or stroke within six months, severe liver impairment, or very low blood pressure. Always disclose all medications and health conditions during your consultation.

Choosing Between Branded and Generic

At EverydayMeds, patients can choose between sildenafil (generic) and Viagra (branded) at checkout. Both contain identical active ingredients and work in exactly the same way - the main difference is cost, with generic sildenafil offering significant savings while maintaining the same clinical effectiveness and safety profile as the branded version.

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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