What is the difference between tadalafil and sildenafil?
Tadalafil acts longer (up to ~36 hours) and supports daily-dose continuity. Sildenafil acts faster (~30–60 minutes) with a shorter window (~4–6 hours) and is typically used on demand. Both are provider-reviewed PDE5 inhibitors; choice depends on lifestyle, cardiovascular profile, and continuity preference.
Full answer
Tadalafil and sildenafil are both PDE5 inhibitors prescribed for erectile function and, in some cases, related vascular indications. The clinically meaningful differences are duration, onset, and dosing cadence. Sildenafil has a faster onset (typically 30–60 minutes) and a shorter active window (approximately 4–6 hours), which favors on-demand use timed to activity. Tadalafil's half-life is significantly longer (up to ~36 hours), which supports both higher-dose on-demand use and a low-dose daily cadence that removes the timing question entirely. Choice is provider-reviewed against the patient's cardiovascular history, current medications (especially nitrates, alpha-blockers, and certain antihypertensives), liver and kidney function, lifestyle, and continuity preference. Neither molecule treats underlying endocrine or vascular root causes — those are evaluated separately as part of the optimization assessment.
Educational. Not a substitute for individualized provider review.
- Sexual wellness pathways — Primary source · oMeds
- Sexual health (men's) — Reference · oMeds Learn
- Reviewed by Dr. Laura Purdy, MD, MBA · Clinical Director, oMeds · Last reviewed 2026-05-29