Sildenafil Tablets: Essential Quick Facts Guide

Need immediate information about sildenafil tablets? This comprehensive quick reference covers everything you need to know about generic sildenafil for erectile dysfunction treatment. From dosages and timing to side effects and safety considerations, find the essential facts about this proven ED medication. Whether you're considering sildenafil for the first time or need a quick reference guide, this fact sheet provides clear, accurate information to help you understand how sildenafil tablets work and what to expect from treatment.

  • Available in 25mg, 50mg, and 100mg strengths with 50mg as the typical starting dose
  • Works within 30-60 minutes and effects can last 4-6 hours when sexually stimulated
  • Same active ingredient as branded Viagra but at a lower cost
  • Requires prescription following clinical assessment by UK-licensed prescriber
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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.

Complete Quick Reference Guide for Sildenafil Tablets

What Are Sildenafil Tablets?

Sildenafil tablets contain the same active ingredient as branded Viagra but are available as a generic medication at a lower cost. These prescription-only medicines work by increasing blood flow to the penis when sexually aroused, helping men achieve and maintain erections suitable for sexual activity. EverydayMeds offers both generic sildenafil and branded Viagra, allowing patients to choose their preferred option at checkout.

The medication belongs to a class of drugs called PDE5 inhibitors, which block the phosphodiesterase type 5 enzyme. This action helps relax blood vessels and improve circulation to the penile tissue during sexual stimulation.

Available Strengths and Dosing

Sildenafil tablets are available in three strengths: 25mg, 50mg, and 100mg. The typical starting dose is 50mg, taken approximately 30-60 minutes before sexual activity. Your prescriber may adjust this to 25mg if you experience side effects or increase to 100mg if 50mg proves insufficient.

The maximum dose is one tablet per 24-hour period. Taking sildenafil on an empty stomach or after a light meal can help it work more quickly, as high-fat meals may delay the onset of action. The effects can last 4-6 hours, though this doesn't mean an erection will persist for this duration.

How Quickly Does Sildenafil Work?

Most men find sildenafil begins working within 30-60 minutes of taking the tablet. However, sexual stimulation is still required for the medication to be effective. The tablet doesn't cause automatic erections but rather helps the body's natural response to sexual arousal.

For optimal timing, take your prescribed dose about one hour before planned sexual activity. Some men may notice effects as early as 15-30 minutes, whilst others may need to wait up to 90 minutes, particularly if taken with food.

Common Side Effects Quick Reference

The most frequently reported side effect is headache, affecting more than 1 in 10 men. Other common side effects include facial flushing, indigestion, nasal congestion, dizziness, and temporary visual changes such as a blue tinge to vision or increased light sensitivity.

These side effects are typically mild and temporary, often becoming less noticeable with continued use. If you experience persistent or severe side effects, consult your prescriber about potentially adjusting your dose.

Important Safety Considerations

Never take sildenafil with nitrate medications such as GTN spray or isosorbide tablets, as this combination can cause dangerous drops in blood pressure. Recreational drugs containing nitrates ("poppers") must also be avoided completely.

Men taking alpha-blockers for prostate problems or blood pressure medications should inform their prescriber, as dose adjustments may be necessary. If you have heart conditions, recent stroke or heart attack history, or severe liver problems, sildenafil may not be suitable for you.

Effectiveness and Expectations

Clinical studies show sildenafil helps approximately 70-80% of men with erectile dysfunction. The medication may become more effective over several uses as you and your body adjust to the treatment. It's important to maintain realistic expectations - sildenafil helps with the physical aspects of achieving erections but doesn't increase sexual desire or arousal.

If the medication doesn't work effectively on the first few attempts, discuss with your prescriber whether a dose adjustment might help before considering it ineffective.

Storage and Handling

Store sildenafil tablets in their original packaging below 30°C, away from moisture and direct sunlight. Keep all medications out of reach of children and never share your prescription with others. Check expiry dates regularly and dispose of expired medications safely through your local pharmacy.

When to Seek Medical Advice

Seek immediate medical attention if you experience an erection lasting more than 4 hours (priapism), sudden vision or hearing loss, chest pain during sexual activity, or signs of severe allergic reaction. These are rare but serious side effects requiring urgent treatment.

Contact your prescriber if you're experiencing persistent side effects, the medication isn't working effectively after several attempts, or if you develop new medical conditions or start new medications that might interact with sildenafil.

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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