Viagra & Sildenafil Strength Comparison Guide

Understanding the different strengths of Viagra and sildenafil can help you make an informed choice about ED treatment. Both medications contain the same active ingredient - sildenafil citrate - but are available in varying doses to suit individual needs. EverydayMeds offers both branded Viagra and generic sildenafil options, allowing you to choose based on your preferences and budget after completing our clinical assessment.

  • 25mg, 50mg and 100mg strengths available for both Viagra and sildenafil
  • Starting dose is typically 50mg, adjustable based on effectiveness
  • Generic sildenafil offers the same active ingredient at a lower cost
  • Maximum one dose per 24-hour period regardless of strength chosen
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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.

Comparing Viagra and Sildenafil Dosage Options

Available Strengths: Viagra vs Sildenafil

Both Viagra and generic sildenafil are available in three main strengths: 25mg, 50mg, and 100mg tablets. The 50mg dose is typically recommended as the starting point for most men, as clinical studies have shown this provides an effective balance between therapeutic benefit and tolerability. Your prescriber may adjust this dose based on how well you respond to treatment and any side effects you may experience.

How Dosage Affects Treatment Outcomes

The effectiveness of sildenafil is dose-dependent, meaning higher doses generally provide stronger effects. However, this doesn't mean the highest dose is always the best choice. Many men find 50mg provides sufficient improvement in erectile function, whilst minimising the risk of side effects such as headaches, flushing, or nasal congestion. The 25mg strength may be more appropriate for older men or those taking certain medications that could interact with sildenafil.

Cost Comparison: Branded vs Generic

One significant advantage of choosing generic sildenafil over branded Viagra is the substantial cost savings. Generic sildenafil contains exactly the same active ingredient as Viagra and must meet the same strict quality standards set by the MHRA. The lower price reflects the absence of brand marketing costs rather than any difference in quality or effectiveness. At EverydayMeds, we offer both options so you can choose based on your personal preferences and budget considerations.

Adjusting Your Dose Safely

If your initial dose isn't providing the desired results, your prescriber may recommend adjusting to either 25mg or 100mg. This adjustment should only be made following consultation with a healthcare professional. Factors influencing dose adjustment include your overall health, other medications you're taking, and how well you tolerated your initial dose. It's important never to exceed 100mg or take more than one dose within a 24-hour period.

Timing and Administration

Regardless of which strength you choose, sildenafil should be taken approximately 30-60 minutes before sexual activity. The medication works by increasing blood flow when you're sexually aroused - it won't cause an automatic erection. Food, particularly high-fat meals, can delay the onset of action, so consider timing your dose accordingly. The effects typically last 4-6 hours, providing a suitable window for sexual activity.

Making Your Choice at EverydayMeds

When you complete our online consultation, our UK-licensed prescribers will recommend the most appropriate starting dose based on your medical history and current health status. At checkout, you'll have the option to choose between branded Viagra or generic sildenafil in your prescribed strength. Both options require the same prescription process and offer identical clinical outcomes, with the main difference being cost and personal preference for branded or generic medications.

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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