Cialis Daily vs As Needed: Tadalafil Doses Compared
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[Sexual health · Comparison]

Cialis daily vs as needed: how do the two tadalafil schedules differ?

Label doses · Timing · BPH · Side effects · Limits

Short answer: Same drug, two label schedules. As needed, Cialis starts at 10 mg before sexual activity (range 5 to 20 mg, at most once a day) and improved erections for up to 36 hours.1 Once daily, it starts at 2.5 mg (up to 5 mg) at the same time every day regardless of timing. Only the 5 mg daily dose is also approved for BPH.1

How do daily and as-needed Cialis compare side by side?

From the US Cialis label.
Cialis once dailyCialis as needed
Label dose for ED2.5 mg to start, may increase to 5 mg110 mg to start, may go to 20 mg or down to 5 mg1
TimingAbout the same time every day, regardless of sexual activity1Before anticipated sexual activity; at most once a day1
How long it worksSteady state reached within 5 days; exposure about 1.6 times a single dose1Improved erections vs placebo for up to 36 hours after a dose1
BPH5 mg daily is approved for BPH, and for ED with BPH1Not approved for BPH
Headache in 12-week trials3% (2.5 mg) and 6% (5 mg) vs 5% on placebo111% (10 mg) and 15% (20 mg) vs 5% on placebo1
Indigestion in trials4% (2.5 mg) and 5% (5 mg) vs 2% on placebo18% (10 mg) and 10% (20 mg) vs 1% on placebo1
Severe kidney impairmentNot recommended1At most 5 mg once every 72 hours1
With strong CYP3A4 inhibitors (e.g. ritonavir)At most 2.5 mg1At most 10 mg once every 72 hours1
Half-lifeabout 17.5 hours (label: 17.5 hours)1Same drug, same half-life

Reviewed . Half-life figures are shown only where the value Dose Track uses agrees with the cited source.

Why can tadalafil be taken either way?

Tadalafil has a mean half-life of 17.5 hours and peaks a median of 2 hours after a dose (range 30 minutes to 6 hours).1 A single as-needed dose covers a long window, up to 36 hours in trials. A small daily dose builds to a steady level within 5 days, so timing around sex stops mattering.1

What did the trials test?

As-needed Cialis was studied in eight 12-week placebo-controlled trials; 3.1% on 10 or 20 mg stopped for side effects vs 1.4% on placebo.1 Once-daily Cialis was studied in three trials of 12 or 24 weeks with 853 men, without restricting the timing of sex; 4.1% stopped for side effects vs 2.8% on placebo.1 The two schedules were not tested against each other in these trials.

What safety rules apply to both?

  • Nitrates: never with any nitrate. If nitroglycerin is needed in an emergency, at least 48 hours should pass after the last dose.1
  • Erections over 4 hours: get emergency care.1
  • Sudden vision or hearing loss: stop and seek medical care.1

More detail: Cialis side effects and the Cialis dosing schedule.

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Frequently asked questions

Is 5 mg Cialis daily the same as 20 mg once?+
No. They are different label schedules. Daily 2.5 or 5 mg keeps a steady level regardless of timing; as-needed 10 or 20 mg is taken before sex. Side effects such as headache were reported less often at the daily doses in the label trials.1
How long does as-needed Cialis last?+
In trials it improved erections compared with placebo for up to 36 hours after a dose.1
Can you take Cialis daily for BPH?+
Yes. 5 mg once daily is approved for BPH and for ED with BPH. The as-needed schedule is not approved for BPH.1
How long until daily Cialis reaches a steady level?+
Within 5 days of once-daily dosing, per the label.1
Can I track Cialis in Dose Track?+
Yes. Tadalafil is built in. Log a daily dose with a reminder, or log as-needed doses, and see estimated levels from its half-life.

Sources

  1. Cialis (tadalafil) tablets prescribing information, sections 1 to 7, 12.3 and 14. DailyMed, version of June 2026.

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