Daily or on-demand — pick deliberately
This is the only real decision to make about tadalafil, and it is a lifestyle question rather than a clinical one. Both patterns are FDA-approved and both work.
| Daily low dose | On-demand | |
|---|---|---|
| Typical strength | 2.5 mg or 5 mg every day | 10 mg or 20 mg before sex |
| Planning required | None — you are always covered | Take it a couple of hours ahead |
| Suits | Regular or unpredictable frequency | Occasional, plannable use |
| Cost pattern | Every day, whether used or not | Only when you use it |
| Secondary benefit | Also treats enlarged-prostate urinary symptoms | None |
What to expect, and what to report
- Headache, flushing, indigestion and a blocked nose are the common ones across the class.
- Back and muscle ache is more characteristic of tadalafil specifically, and usually settles within a couple of days of a dose.
- The long half-life means a side effect also lasts longer than it would with sildenafil.
- Sudden vision or hearing loss is rare, and is an immediate stop-and-seek-help event.
- An erection lasting more than four hours is an emergency. Go to an emergency department.
FAQ
Frequently asked questions
Is tadalafil better than sildenafil?
Neither is more effective. Tadalafil lasts far longer, which most men who try both prefer, and it is far less affected by food.
Should I take it daily or as needed?
Daily suits regular or unpredictable frequency and removes planning altogether; on-demand suits occasional, plannable use. Around twice a week is where daily usually starts to make more sense.
Is it the same as Cialis?
Yes — the same active ingredient at the same strengths, meeting the FDA standard for a generic.
Why does my back ache?
Back and muscle ache is the side effect most characteristic of tadalafil. It usually settles within a day or two and often improves on a lower dose. Persistent pain is worth raising with a clinician.
Sources
What this is based on
We link to primary sources — clinical guidelines, regulator publications and peer-reviewed research — wherever possible. Links open on third-party sites we do not control.
- [01]U.S. Food and Drug Administration. Drugs@FDA — approved drug products and prescribing information.
- [02]American Urological Association. Erectile Dysfunction: AUA Guideline (2018).
- [03]National Association of Boards of Pharmacy. Digital Pharmacy Accreditation and safe site listings.