What Will Viagra Do: When to Seek Medical Help

Viagra may help treat erectile dysfunction, but it's important to understand when medical attention is needed. Whether you're considering Viagra (branded) or sildenafil (generic), knowing the warning signs and contraindications can help ensure safe usage. This guide explains what Viagra does and when to consult healthcare professionals immediately.

  • Seek emergency help if erection lasts over 4 hours (priapism)
  • Contact doctor immediately if experiencing chest pain during sexual activity
  • Stop use and seek medical advice for sudden vision or hearing loss
  • Consult GP before use if taking heart medications or nitrates
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Not sure which one? Here's the honest comparison.

Sildenafil
~60 min
~4 hrs
you like to plan ahead
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Tadalafil (as-needed)Most prescribed
~30 min
up to 36 hrs
you want a whole weekend covered
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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
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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.

Emergency Situations Requiring Immediate Medical Care

Understanding How Viagra Works

Viagra contains sildenafil citrate, which increases blood flow to the penis when sexually aroused. EverydayMeds offers both Viagra (branded) and sildenafil (generic) options, allowing patients to choose based on preference and budget. The medication typically works within 30-60 minutes and effects may last 4-6 hours, though this doesn't mean an erection lasts this duration.

When to Seek Emergency Medical Help

Certain situations require immediate medical attention. Priapism, an erection lasting more than 4 hours, is a medical emergency that can cause permanent damage. Contact emergency services immediately. Similarly, sudden vision or hearing loss, though rare, requires urgent medical assessment. Chest pain, dizziness, or nausea during sexual activity warrants stopping use and seeking immediate help.

Pre-Treatment Medical Consultation Requirements

Before using Viagra or sildenafil, consult your GP if you have heart conditions, recent stroke or heart attack history, or take medications for chest pain. Those taking nitrates (GTN spray, heart tablets) must not use Viagra due to dangerous interactions causing severe blood pressure drops. EverydayMeds' clinical assessment helps identify these contraindications through proper medical screening.

Recognising Contraindications and Drug Interactions

Viagra isn't suitable for everyone. Men with severe heart disease, very low blood pressure, or severe liver problems shouldn't use this medication. Drug interactions with nitrates, riociguat, or some HIV medications can be dangerous. Always inform prescribers about current medications, including over-the-counter drugs and supplements.

When to Contact Your Regular GP

Contact your doctor if Viagra doesn't work after several attempts, causes persistent side effects, or if your erectile dysfunction suddenly worsens. Changes in underlying health conditions may affect suitability for treatment. Your GP can review your overall health and adjust treatment accordingly.

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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