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Abiraterone Dosage

Medically reviewed by Drugs.com. Last updated on March 13, 2020.

Applies to the following strengths: 250 mg; 500 mg; 125 mg

Usual Adult Dose for Prostate Cancer

Metastatic CRPC:
-Regular formulation: 1000 mg orally once daily (in combination with methylprednisolone 5 mg orally 2 times daily)
-Micronized formulation: 500 mg orally once daily (in combination with methylprednisolone 4 mg orally 2 times daily)

Metastatic high-risk CSPC:
-Regular formulation: 1000 mg orally once daily (in combination with methylprednisolone 5 mg orally once daily)
-Micronized formulation: 500 mg orally once daily (in combination with methylprednisolone 4 mg orally 2 times a day)

Comments:
-Patients receiving this drug should also receive a gonadotropin-releasing hormone (GnRH) analog concurrently or should have had bilateral orchiectomy.
NOTE: Different abiraterone acetate formulations have different indications and different dosing. Below are suggested dosing guidelines. Refer to the manufacturer product information before prescribing this drug.

Uses:
In combination with prednisone for the treatment of patients with:
-Metastatic castration-resistant prostate cancer (CRPC)
-Metastatic high-risk castration-sensitive prostate cancer (CSPC)

Renal Dose Adjustments

No adjustment recommended.

Liver Dose Adjustments

REGULAR FORMULATION:
-Mild liver impairment (Child-Pugh A): No adjustment recommended.
-Moderate liver impairment (Child-Pugh B): Reduce the starting dose to 250 mg orally once a day
-Severe Liver Dysfunction (Child-Pugh C): Not recommended.
DEVELOPMENT OF HEPATOTOXICITY (ALT AND/OR AST GREATER THAN 5 X ULN OR TOTAL BILIRUBIN GREATER THAN 3 X ULN):
-Interrupt therapy, then restart at a reduced dose of 750 mg orally once a day following return of liver function tests to baseline or to ALT and AST 2.5 x ULN or less and total bilirubin 1.5 x ULN or less.
-For patients who resume therapy, monitor serum transaminases and bilirubin at a minimum of every 2 weeks for 3 months and monthly thereafter.
-If hepatotoxicity recurs at 750 mg/day, then restart at a reduced dose of 500 mg orally once a day following return of liver function tests to baseline or to ALT and AST 2.5 x ULN or less and total bilirubin 1.5 x ULN or less.
-Discontinue therapy if hepatotoxicity recurs at 500 mg/day.
-Permanently discontinue therapy in patients who develop a concurrent elevation of ALT greater than 3 x ULN and total bilirubin greater than 2 x ULN in the absence of biliary obstruction or other causes responsible for the concurrent elevation.

MICRONIZED FORMULATION:
-Mild liver impairment (Child-Pugh A): No adjustment recommended.
-Moderate liver impairment (Child-Pugh B): Reduce starting dose to 125 mg orally once a day; monitor ALT, AST, and bilirubin prior to the start of therapy, every week for the first month, every 2 weeks for the following 2 months of therapy and monthly thereafter. If elevations in ALT and/or AST greater than 5 x upper limit of normal (ULN) or total bilirubin greater than 3 x ULN occur in patients with baseline moderate hepatic impairment, discontinue therapy permanently.
-Severe liver impairment (Child-Pugh C): Not recommended.
DEVELOPMENT OF HEPATOTOXICITY (ALT AND/OR AST GREATER THAN 5 X ULN OR TOTAL BILIRUBIN GREATER THAN 3 X ULN) in patients with baseline moderate hepatic impairment:
-Interrupt therapy, then restart at a reduced dose of 375 mg orally once a day following return of liver function tests to baseline or to ALT and AST 2.5 x ULN or less and total bilirubin 1.5 x ULN or less. For patients who resume therapy, monitor serum transaminases and bilirubin at a minimum of every 2 weeks for 3 months and monthly thereafter.
-If hepatotoxicity recurs at 375 mg/day, then restart at a reduced dose of 250 mg orally once a day following return of liver function tests to baseline or to ALT and AST 2.5 x ULN or less and total bilirubin 1.5 x ULN or less.
-Discontinue therapy if hepatotoxicity recurs at 250 mg/day.
-Permanently discontinue therapy in patients who develop a concurrent elevation of ALT greater than 3 x ULN and total bilirubin greater than 2 x ULN in the absence of biliary obstruction or other causes responsible for the concurrent elevation.

Dose Adjustments

REGULAR FORMULATION:
CONCOMITANT USE OF STRONG CYP450 3A4 INDUCER:
-Avoid concomitant use if possible.
-If concomitant use is necessary, increase the dosing frequency to 1000 mg orally 2 times a day during the coadministration period.
-Return to the previous dosing frequency once the strong CYP450 3A4 inducer is discontinued.
CONCOMITANT USE OF CYP450 2D6 SUBSTRATES WITH NARROW THERAPEUTIC INDEX:
-Avoid concomitant use if possible.
-If concomitant use is necessary, consider a dose reduction of the CYP450 2D6 substrate during the coadministration period.

MICRONIZED FORMULATION:
CONCOMITANT USE OF STRONG CYP450 3A4 INDUCER:
-Avoid concomitant use if possible.
-If concomitant use is necessary, increase the dosing frequency to 5000 mg orally 2 times a day during the coadministration period.
-Return to the previous dosing frequency once the strong CYP450 3A4 inducer is discontinued.
CONCOMITANT USE OF CYP450 2D6 SUBSTRATES WITH NARROW THERAPEUTIC INDEX:
-Avoid concomitant use if possible.
-If concomitant use is necessary, consider a dose reduction of the CYP450 2D6 substrate during the coadministration period.

Precautions

CONTRAINDICATIONS:
-None

Safety and efficacy have not been established in patients younger than 18 years.

Consult WARNINGS section for additional precautions.

Dialysis

Data not available

Other Comments

Administration Advice:
-NOTE: Different products are not interchangeable.
-This drug should be taken on an empty stomach at least one hour before or at least two hours after a meal with the exception of the micronized formulation which may be taken with or without food.
-This drug should be swallowed whole with water.
-Drug tablets should not be crushed or chewed.
-Pregnant women should not handle this drug without protection (e.g., gloves).
-In the event of a missed dose, the missed dose should be skipped and therapy should be resumed the following day with the usual daily dose.

Monitoring:
-Cardiovascular: Cardiac function
-Endocrine: Blood pressure, serum potassium, fluid retention, signs/symptoms of adrenocortical insufficiency
-Hepatic: ALT, AST, bilirubin
-Metabolic: Blood sugar (in diabetic patients)

Frequently asked questions

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.