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Usual Dosing (Adults)

Erectile dysfunction: 10 mg orally prior to anticipated sexual activity (given as a single dose only - not given more than once daily). Dosing range: 5-20 mg.   
Adjust dose if patient receiving an alpha blocker or CYP3A4 inhibitor.

Renal Dosing

dialysis [>50 ml/min]: No changes

[31-50]: Initial dose 5 mg once daily - maximum dose 10 mg not to be given more frequently than every 48 hours.

[< 30 or hemodialysis]: Maximum dose 5 mg.

Hemodialysis

dialysis Maximum dose 5 mg.

Reference(s)

National Institutes of Health, U.S. National Library of Medicine, DailyMed Database.
Provides access to the latest drug monographs submitted to the Food and Drug Administration (FDA). Please review the latest applicable package insert for additional information and possible updates.  A local search option of this data can be found here.
Tadalafil