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Avapritinib Dosage

Applies to the following strengths: 100 mg; 200 mg; 300 mg

Usual Adult Dose for Stomach Cancer

300 mg orally once a day until disease progression or unacceptable toxicity

Use: For the treatment of adults with unresectable or metastatic GIST harboring a
platelet-derived growth factor receptor alpha (PDGFRA) exon 18 mutation, including PDGFRA D842V mutations

Renal Dose Adjustments

Mild (60 to less than 90 mL/min) to moderate (30 to less than 60 mL/min) renal impairment: No adjustment recommended.
Severe (15 to less than 30 mL/min) or end-stage (less than 15 mL/min) renal impairment: Data not available

Liver Dose Adjustments

Mild (total bilirubin less than or equal to upper limit of normal [ULN] and aspartate aminotransferase [AST] greater than ULN or total bilirubin greater than 1 to 1.5 times ULN and any AST) or moderate (total bilirubin greater than 1.5 to 3 x ULN and any AST) hepatic impairment: No adjustment recommended.
Severe hepatic impairment: Data not available

Dose Adjustments

RECOMMENDED DOSE REDUCTIONS:
-First dose reduction: 200 mg orally once a day
-Second dose reduction: 100 mg orally once a day
-Permanently discontinue therapy in patients unable to tolerate 100 mg orally once a day.

RECOMMENDED DOSE REDUCTIONS FOR ADVERSE REACTIONS:
INTRACRANIAL HEMORRHAGE:
Grade 1 or 2:
-First occurrence: Withhold this drug until resolution; resume at reduced dose.
-Subsequent occurrence: Permanently discontinue this drug.
Grade 3 or 4:
-Permanently discontinue this drug.
CENTRAL NERVOUS SYSTEM EFFECTS:
-Grade 1: Continue at same dose or withhold until improvement to baseline or resolution; resume at same OR reduced dose.
-Grade 2 or 3: Withhold this drug until improvement to baseline, Grade 1, or resolution; resume at same OR reduced dose.
Grade 4: Permanently discontinue therapy.
OTHER ADVERSE REACTIONS:
Grade 3 or 4: Withhold this drug until improvement to less than or equal to Grade 2; resume at same OR reduced dose.

Concomitant Use of Strong or Moderate CYP450 3A Inhibitors:
-Avoid concomitant use of this drug with strong or moderate CYP450 3A inhibitors.
-If concomitant use with a moderate CYP450 3A inhibitor cannot be avoided, reduce the starting dose of this drug from 300 mg once a day to 100 mg a day.

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:
-This drug should be taken on an empty stomach, at least 1 hour before or 2 hours after a meal.
-Do not take an additional dose if vomiting occurs after taking this drug but continue with the next scheduled dose.
-If a dose is missed do not make up for a missed dose within 8 hours of the next
scheduled dose.

Storage requirements:
-Store at 20C to 25C (68F to 77F); excursions are permitted from 15C to 30C (59F to 86F).

Further information

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

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