Is 20mg Cialis Equal to 100mg Viagra?
When talking about treatments for erectile dysfunction (ED), two medications always lead the conversation: Cialis (Tadalafil) and Viagra (Sildenafil Citrate). A question many men ask is, “Is 20mg Cialis Equal to 100mg Viagra? The simple answer is no — but there’s more to the story. In this guide, we’ll break down dosage differences, duration, effects, side effects, and what real users are saying to help you choose what’s right for you.
Understanding ED Medications
Both Cialis and Viagra belong to a group of drugs called PDE5 inhibitors. They help boost blood flow to the penis during arousal. Even though they work similarly, they vary in how fast they kick in, how long they last, and how your body breaks them down.
Cialis (Tadalafil):
- Starts working: Around 30 to 45 minutes
- Lasts: Up to 36 hours
- Can be taken daily in low doses (2.5mg or 5mg)
Viagra (Sildenafil):
- Starts working: Around 30 to 60 minutes
- Lasts: 4 to 6 hours
- Best for planned sex
Is 20mg Cialis Equal to 100mg Viagra?
Not really. Though both are considered their highest standard doses, they act differently in your body.
Why the Comparison?
- 100mg Viagra is the top recommended dose
- 20mg Cialis is the strongest dose typically prescribed
Still, they aren’t interchangeable. Their effects and timing don’t match up exactly.
What Reddit Users Say
People on Reddit often share how these doses work for them:
“Cialis gives me freedom — I don’t have to schedule things.”
“Viagra works fast and gives me a strong erection quickly.”
Highlights:
- Cialis is good for longer-lasting, flexible intimacy
- Viagra is great for targeted, fast action
Insights from Quora
Experts and everyday users on Quora usually agree:
- Cialis = better for long sessions or weekends
- Viagra = better for reliable, fast results
Comparing Is 20mg Cialis Equal to 100mg Viagra Doses
There’s no official match, but these are common approximations:
- 20mg Cialis ≈ 100mg Viagra
- 10mg Cialis ≈ 50mg Viagra
These are not strict conversions — always check with your doctor.
10mg Cialis vs 50mg Viagra
Both work, but in different ways:
- Viagra acts quicker but fades sooner
- Cialis starts slower but stays active much longer
Cialis vs Viagra Breakdown
| Feature | Cialis (Tadalafil) | Viagra (Sildenafil) |
| Duration | Up to 36 hours | 4–6 hours |
| Onset | 30–45 min | 30–60 min |
| Food Effect | Minimal | Can be affected by meals |
| Daily Use | Yes (2.5mg/5mg) | No |
Common Side Effects
- Headache
- Flushed face
- Stuffy nose
- Indigestion
- Lightheadedness
More with Cialis:
- Back pain
More with Viagra:
- Temporary blue-tinged vision
Do Viagra or Cialis Change Penis Size?
No. Neither drug makes your penis permanently bigger. They simply improve erection quality:
- Stronger, fuller erections
- May look slightly larger when aroused due to firmness
How Long Do Effects of Viagra or Cialis Last?
- Cialis: Up to 36 hours
- Viagra: 4 to 6 hours
Note: This is about potential to get an erection—not being erect the whole time.
Is 5mg Cialis Equal to 100mg Viagra?
Definitely not. 5mg Cialis is a low daily dose. 100mg Viagra is a one-time, full-strength dose.
For Premature Ejaculation?
Not officially approved, but many say:
- Cialis helps you relax and stay ready longer
- Viagra helps with focus and control
Which One’s Better?
That depends on your situation:
- Need all-day flexibility? → Go with Cialis
- Need quick, reliable results? → Try Viagra
Price Check
- Generic Viagra is usually cheaper
- Cialis can cost more, especially brand-name
- You can buy affordable generics online at Meds4go (USA, UK, Australia)
Summary
Is 20mg Cialis equal to 100mg Viagra?
Not exactly — they work differently and suit different needs:
- Cialis: Long-lasting, flexible window
- Viagra: Strong, fast-acting effect
👉 Talk to your doctor before changing or combining ED meds.
Want to try one? Buy Cialis or Viagra online from trusted pharmacies like Meds4shop USA, UK & Australia.