Cialis vs Viagra for ED
Cialis is a brand name for tadalafil; Viagra is a brand name for sildenafil. Both are PDE5 inhibitors for erectile dysfunction. They differ mainly in duration, food interaction, and whether a daily dose is typically used. Neither is universally better — a licensed clinician matches the option to your health and lifestyle.
Written by Virantus Editorial Team
Medically reviewed by Virantus Clinical Team · Reviewed August 2026
Last updated August 2026
Brand names vs active ingredients
Viagra is the brand name for sildenafil. Cialis is the brand name for tadalafil. Generic versions contain the same active ingredients when dispensed appropriately. A clinician and pharmacy determine what you receive — not marketing on a website.
When people search for Cialis vs Viagra, they are usually comparing two PDE5 inhibitor approaches to ED. The comparison below uses the active ingredients because that is what actually differs medically.
How to think about the choice
Some men prefer sildenafil (Viagra) for predictable, shorter windows. Others prefer tadalafil (Cialis) for longer duration or daily low-dose options. Side effects, other medications, cardiovascular health, and cost also factor into the decision.
A licensed clinician evaluates your full health picture before recommending either medication. This page is educational — not prescribing guidance.
| Factor | Viagra (sildenafil) | Cialis (tadalafil) |
|---|---|---|
| Typical onset | 30–60 minutes | 30–60 minutes (as-needed) |
| Typical duration | About 4–6 hours | Up to 36 hours (as-needed) |
| Daily dosing option | Not typically used daily | Available as daily low dose |
| Food interaction | High-fat meals may delay onset | Less affected by food |
| Drug class | PDE5 inhibitor | PDE5 inhibitor |
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