NHS Guidelines Before Taking Viagra: Essential Checklist

Before starting Viagra treatment, it's crucial to follow NHS guidelines and complete proper medical assessments. EverydayMeds provides both branded Viagra and generic Sildenafil options through our UK-licensed prescribers. This comprehensive checklist ensures you understand the essential requirements, safety considerations, and eligibility criteria before beginning treatment for erectile dysfunction.

  • Complete online medical consultation with UK-licensed prescriber
  • Review current medications for dangerous interactions, especially nitrates
  • Declare any heart conditions, blood pressure issues, or recent medical events
  • Choose between branded Viagra or cost-effective Sildenafil generic at checkout
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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 Medical Assessment Requirements

Essential Health Checks Before Treatment

Before prescribing Viagra or Sildenafil, UK-licensed healthcare professionals must evaluate your cardiovascular health thoroughly. This assessment includes reviewing your blood pressure, heart function, and any history of strokes or heart attacks within the past six months. Men with severe heart disease, very low blood pressure, or those taking nitrate medications cannot safely use these treatments due to potentially dangerous interactions.

Medication Interactions You Must Declare

Honesty during your medical consultation could save your life. Nitrate medications, including GTN sprays and isosorbide tablets commonly prescribed for chest pain, create dangerous blood pressure drops when combined with Viagra or Sildenafil. Alpha-blockers for prostate problems may also require dosage adjustments. Always declare recreational substances, as poppers containing nitrates pose serious health risks when combined with ED treatments.

Choosing Between Branded Viagra and Generic Sildenafil

EverydayMeds offers both options at checkout following your approved consultation. Branded Viagra contains the same active ingredient as generic Sildenafil but comes at a premium price. Both medications work identically, taking 30-60 minutes to become effective and lasting up to six hours. Your choice depends on personal preference and budget considerations, as both undergo identical safety assessments.

Dosage Guidelines and Safety Protocols

Starting doses typically begin at 50mg, taken approximately one hour before sexual activity. Depending on effectiveness and tolerability, doses may be adjusted to 25mg or increased to 100mg maximum. Never exceed one tablet per 24-hour period, and avoid fatty meals which can delay onset. Both Viagra and Sildenafil require sexual stimulation to work effectively.

When Treatment Isn't Suitable

Certain medical conditions make Viagra and Sildenafil inappropriate treatment options. Men with severe liver problems, hereditary eye conditions affecting the retina, or allergies to Sildenafil cannot use these medications safely. Recent medical events including strokes, heart attacks, or major surgery within six months typically require clearance from specialists before ED treatment approval.

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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