Tadalafil 20mg Daily for ED: Not Recommended
You should not take tadalafil 20 mg daily for erectile dysfunction. The FDA-approved dosing for once-daily tadalafil is 2.5 mg or 5 mg, not 20 mg 1. The 20 mg dose is specifically approved only for "as-needed" use (taken prior to anticipated sexual activity), with a maximum frequency of once per day 1.
FDA-Approved Dosing Regimens
The FDA label clearly distinguishes between two distinct treatment approaches 1:
Once-Daily Dosing (Your Question)
- Starting dose: 2.5 mg daily
- Maximum dose: 5 mg daily
- Taken at approximately the same time each day
- No timing restriction relative to sexual activity
As-Needed Dosing (Alternative)
- Starting dose: 10 mg
- Maximum dose: 20 mg
- Taken prior to anticipated sexual activity
- Maximum frequency: once per day
- Effective for up to 36 hours after dosing
Why 20mg Daily Is Not Appropriate
Taking 20 mg daily would expose you to 4-8 times the approved daily dose without evidence of additional benefit and with increased risk of adverse effects. The most recent EAU guidelines (2025) confirm that both daily and on-demand dosing provide similar efficacy, but at their respective approved doses 2.
Clinical Evidence Supporting Lower Daily Doses
Research demonstrates that daily 5 mg tadalafil is equally effective to on-demand 20 mg dosing 3, 1. In fact, studies show:
- Daily 2.5-5 mg produces clinically meaningful improvements in erectile function 1
- The treatment effect does not diminish over time with daily dosing 1
- Daily dosing allows for spontaneous sexual activity without timing restrictions 2
Recommended Approach
Start with tadalafil 2.5 mg once daily, taken at the same time each day 1. After assessing your response:
- If inadequate response: Increase to 5 mg daily 1
- If you prefer flexibility: Switch to as-needed dosing (10-20 mg taken before sexual activity) 3
The AUA guidelines emphasize that selection between daily and as-needed dosing should depend on your intercourse frequency and personal preference 3. Daily dosing is particularly advantageous if you desire spontaneity and engage in sexual activity more than twice weekly.
Safety Considerations
Common adverse effects include headache, dyspepsia, flushing, back pain, and nasal congestion 3. These follow a dose-response pattern—higher doses produce more side effects 3. By using 20 mg daily, you would unnecessarily increase your risk of adverse events without proven additional benefit.
Special Populations
If you have renal impairment (creatinine clearance <30 mL/min) or are on hemodialysis, daily tadalafil is not recommended at all 1. For moderate renal impairment (CrCl 30-50 mL/min), start at 2.5 mg daily with a maximum of 5 mg 1.
The bottom line: Use tadalafil as FDA-approved—either 2.5-5 mg daily OR 10-20 mg as-needed, but never 20 mg daily.