Viagra 100mg vs Cialis: Comparing ED Treatments

Choosing between Viagra 100mg and Cialis for erectile dysfunction can be confusing. Both are proven PDE5 inhibitors that help improve blood flow, but they work differently in terms of timing and duration. Understanding the key differences between these medications can help you make an informed decision about which treatment might be more suitable for your lifestyle and needs.

  • Viagra 100mg works within 30-60 minutes and lasts 4-6 hours
  • Cialis offers longer duration (up to 36 hours) but may take longer to work
  • Both require sexual stimulation to be effective
  • Generic sildenafil provides the same benefits as branded Viagra at lower cost
Start your free consultation

Takes less than 2 minutes to complete, 100% online

Your sexual health treatments, all online and made simple.

More pleasure. Less waiting. Built to last.

Get Started

Not sure which one? Here's the honest comparison.

Sildenafil
~60 min
~4 hrs
you like to plan ahead
Explore now
Tadalafil (as-needed)Most prescribed
~30 min
up to 36 hrs
you want a whole weekend covered
Explore now
Tadalafil Daily
always active
continuous
you never want to think about timing
Explore now
Vardenafil
~15–30 min
~8 hrs
you want the fastest onset
Explore now

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.

Key Differences Between Viagra and Cialis

How Viagra 100mg Works

Viagra 100mg contains sildenafil citrate, a PDE5 inhibitor that helps increase blood flow to the penis when sexually aroused. The medication typically begins working within 30-60 minutes of taking it and can remain effective for 4-6 hours. It's important to note that Viagra doesn't cause automatic erections - sexual stimulation is still required for the medication to work effectively.

Cialis: The Alternative Approach

Cialis contains tadalafil, another PDE5 inhibitor that works through the same mechanism as sildenafil. However, Cialis offers a longer duration of action, remaining effective for up to 36 hours after taking a dose. This extended timeframe has earned it the nickname "the weekend pill" among some users. Cialis may take slightly longer to begin working, typically 30-120 minutes.

Timing and Spontaneity Considerations

The choice between Viagra 100mg and Cialis often comes down to timing preferences. Viagra's shorter duration may suit those who prefer to plan intimate moments, whilst Cialis's extended window can offer more spontaneity. Some men find Viagra's quicker onset helpful when timing is important, whilst others appreciate Cialis's flexibility over a longer period.

Side Effects and Tolerability

Both medications can cause similar side effects, including headaches, facial flushing, indigestion, and nasal congestion. However, some men may tolerate one medication better than the other. Viagra side effects typically resolve within 4-6 hours, whilst Cialis side effects may last longer due to the medication's extended duration. Neither medication should be taken with nitrate medications or by men with severe cardiovascular conditions.

Cost Considerations: Branded vs Generic

At EverydayMeds, patients can choose between branded Viagra and generic sildenafil at checkout. Generic sildenafil contains the same active ingredient as Viagra but typically costs significantly less. This makes treatment more accessible whilst providing identical therapeutic benefits. The choice between branded and generic options is entirely personal preference, as both undergo the same rigorous quality standards.

Making the Right Choice for You

The decision between Viagra 100mg and Cialis depends on individual factors including lifestyle, timing preferences, and how your body responds to each medication. Some men try both under medical supervision to determine which works better for their specific situation. During your consultation with our UK-licensed prescribers, you can discuss these factors to help identify the most suitable treatment option.

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.
Couple laughing together

How it works

Achieve your goals in just a few simple steps.

Step 1

Start Free Consultation

Select safe UK treatments. Quick answers.

Step 2

Review By Our Clinical Team

Our expert team will use your consultation as the basis of our recommendation and communicate with you.

Step 3

Get it delivered fast

We’ll deliver direct to you, as quickly as tomorrow.

Frequently asked questions