Sildenafil Tablets: Your Complete Treatment Guide

Sildenafil tablets are a proven prescription treatment for erectile dysfunction, available as both generic sildenafil and branded Viagra. This comprehensive guide covers everything you need to know about sildenafil, including how it works, dosages, eligibility criteria, and what to expect. EverydayMeds offers both branded and generic options following a UK clinical assessment, helping you make an informed choice about your treatment.

  • How sildenafil tablets work to treat erectile dysfunction
  • Available dosages and starting recommendations
  • Eligibility criteria and contraindications
  • Potential side effects and drug interactions
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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.

Understanding Sildenafil for Erectile Dysfunction

What Are Sildenafil Tablets?

Sildenafil tablets contain the active ingredient sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor that helps treat erectile dysfunction. Originally developed by Pfizer as Viagra, sildenafil is now available as both the branded medication and generic versions. EverydayMeds offers both options, allowing patients to choose between branded Viagra or generic sildenafil based on their preferences and budget considerations.

How Sildenafil Works

Sildenafil works by blocking the PDE5 enzyme, which increases blood flow to the penis during sexual arousal. It's important to understand that sildenafil doesn't cause automatic erections - sexual stimulation is still required for the medication to be effective. The medication typically begins working within 30-60 minutes of taking and effects can last 4-6 hours, though this doesn't mean erections last this duration.

Available Dosages and Usage

Sildenafil tablets are available in three strengths: 25mg, 50mg, and 100mg. The typical starting dose 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. Only one tablet should be taken within a 24-hour period. Taking sildenafil with food, particularly fatty meals, may delay the onset of action.

Eligibility and Clinical Assessment

Sildenafil requires a prescription following consultation with a UK-licensed prescriber. The clinical assessment evaluates your medical history, current medications, and cardiovascular health to ensure safe use. Treatment is suitable for adult men aged 18 and over experiencing erectile dysfunction. Women, individuals under 18, and those with certain medical conditions may not be suitable candidates for treatment.

Important Contraindications

Certain individuals should not take sildenafil due to potentially serious health risks. This includes men taking nitrate medications (such as GTN spray), those with severe heart disease, recent heart attack or stroke within six months, severe liver impairment, or very low blood pressure. The medication should also be avoided by those taking riociguat for pulmonary hypertension or individuals with hereditary retinal disorders.

Side Effects and Considerations

Common side effects of sildenafil may include headaches, facial flushing, indigestion, nasal congestion, and dizziness. Most side effects are mild and temporary. Rare but serious side effects include prolonged erections lasting more than four hours (priapism), sudden vision or hearing loss, or severe chest pain. Any concerning symptoms should prompt immediate medical attention.

Drug Interactions

Sildenafil can interact dangerously with certain medications, particularly nitrates and alpha-blockers. It's crucial to inform your prescriber about all current medications, including over-the-counter drugs and supplements. Some medications may require dose adjustments or alternative treatments to be considered.

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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