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Sildenafil vs. Tadalafil: How to Choose the Right ED Medication

Both treat erectile dysfunction effectively, but they work differently. Here's a direct comparison.

C

Clyne Health

February 27, 2026 · 3 min read

SildenafilTadalafilEDComparison

Sildenafil (Viagra) and tadalafil (Cialis) are both PDE5 inhibitors that treat erectile dysfunction by increasing blood flow. They're equally effective overall, but their differences may make one a better fit for your lifestyle.

Sildenafil: The On-Demand Option

Works within 30-60 minutes and lasts 4-6 hours. Best taken on an empty stomach. Typical starting dose is 50mg. Ideal for planned sexual activity.

Tadalafil: The Long-Acting Option

Works within 30-45 minutes but lasts up to 36 hours. Can be taken with or without food. Also available as a daily low-dose (2.5-5mg) for continuous readiness.

Which Should You Choose?

If you prefer spontaneity, daily tadalafil may be ideal. If you prefer on-demand treatment with a shorter duration, sildenafil is typically better. Your Clyne provider can recommend the best option.


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This content is reviewed by Clyne®'s editorial team and grounded in published clinical evidence. Citations are listed at the end of each piece. Clyne® Concierge translates the science; your physician makes all clinical decisions. We never fabricate trial data, patient stories, or outcomes.

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