Is 20 mg Cialis equal to 100 mg Viagra?

Written by Gerardo SisonPharm.D.
Licensed Pharmacist
Updated Jan 13, 2026  •  Published Jan 13, 2026
Datos Verificados

No, 20 mg of Cialis is not equal to 100 mg of Viagra. Cialis and Viagra have different standard dosages, onset times, and durations of action, with Cialis typically dosed at 10–20 mg and lasting up to 36 hours, while Viagra is commonly dosed at 50–100 mg with shorter-lasting effects.

Want to learn more?  Read our full analysis: Cialis vs. Viagra: Differences, similarities, and which is better for you


Medical disclaimer: This content is for general informational purposes only and does not constitute medical advice. Always consult your urologist or healthcare provider before making changes to your medication regimen.

Written by Gerardo SisonPharm.D.
Licensed Pharmacist

Gerardo Sison, Pharm.D., graduated from the University of Florida. He has worked in both community and hospital settings, providing drug information and medication therapy management services. As a medical writer, he hopes to educate and empower patients to better manage their health and navigate their treatment plans.

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