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Ibrance Dosage

Generic name: PALBOCICLIB 75mg
Dosage form: capsule

The information at Drugs.com is not a substitute for medical advice. Always consult your doctor or pharmacist.

Recommended Dose and Schedule

The recommended dose of IBRANCE is a 125 mg capsule taken orally once daily for 21 consecutive days followed by 7 days off treatment to comprise a complete cycle of 28 days. IBRANCE should be taken with food [see Clinical Pharmacology (12.3)].

When coadministered with palbociclib, the recommended dose of letrozole is 2.5 mg taken once daily continuously throughout the 28-day cycle. Please refer to the full prescribing information of letrozole.

When coadministered with palbociclib, the recommended dose of fulvestrant is 500 mg administered on Days 1, 15, 29, and once monthly thereafter. Please refer to the full prescribing information of fulvestrant.

Patients should be encouraged to take their dose of IBRANCE at approximately the same time each day.

If the patient vomits or misses a dose, an additional dose should not be taken. The next prescribed dose should be taken at the usual time. IBRANCE capsules should be swallowed whole (do not chew, crush or open them prior to swallowing). Capsules should not be ingested if they are broken, cracked, or otherwise not intact.

Pre/perimenopausal women treated with the combination IBRANCE plus fulvestrant therapy should be treated with luteinizing hormone-releasing hormone (LHRH) agonists according to current clinical practice standards.

Dose Modification

The recommended dose modifications for adverse reactions are listed in Tables 1, 2 and 3.

Table 1. Recommended Dose Modification for Adverse Reactions
Dose Level Dose
*
If further dose reduction below 75 mg/day is required, discontinue.
Recommended starting dose 125 mg/day
First dose reduction 100 mg/day
Second dose reduction 75 mg/day*
Table 2. Dose Modification and Management – Hematologic Toxicities*
Grading according to CTCAE 4.0.
CTCAE=Common Terminology Criteria for Adverse Events; LLN=lower limit of normal.
*
Table applies to all hematologic adverse reactions except lymphopenia (unless associated with clinical events, e.g., opportunistic infections).
Absolute neutrophil count (ANC): Grade 1: ANC < LLN - 1500/mm3; Grade 2: ANC 1000 - <1500/mm3; Grade 3: ANC 500 - <1000/mm3; Grade 4: ANC <500/mm3
Monitor complete blood counts prior to the start of IBRANCE therapy and at the beginning of each cycle, as well as on Day 14 of the first 2 cycles, and as clinically indicated.
CTCAE Grade Dose Modifications
Grade 1 or 2 No dose adjustment is required.
Grade 3 Day 1 of cycle:
Withhold IBRANCE, repeat complete blood count monitoring within 1 week. When recovered to Grade ≤2, start the next cycle at the same dose.

Day 14 of first 2 cycles:
Continue IBRANCE at current dose to complete cycle. Repeat complete blood count on Day 21.

Consider dose reduction in cases of prolonged (>1 week) recovery from Grade 3 neutropenia or recurrent Grade 3 neutropenia in subsequent cycles.
Grade 3 neutropenia with fever ≥38.5 °C and/or infection Withhold IBRANCE until recovery to Grade ≤2.
Resume at the next lower dose.
Grade 4 Withhold IBRANCE until recovery to Grade ≤2.
Resume at the next lower dose.
Table 3. Dose Modification and Management – Non-Hematologic Toxicities
CTCAE Grade Dose Modifications
Grading according to CTCAE 4.0.
CTCAE=Common Terminology Criteria for Adverse Events.
Grade 1 or 2 No dose adjustment is required.
Grade ≥3 non-hematologic toxicity (if persisting despite optimal medical treatment) Withhold until symptoms resolve to:
  • Grade ≤1;
  • Grade ≤2 (if not considered a safety risk for the patient)
Resume at the next lower dose.

Refer to the full prescribing information for coadministered endocrine therapy dose adjustment guidelines in the event of toxicity and other relevant safety information or contraindications.

Dose Modifications for Use With Strong CYP3A Inhibitors

Avoid concomitant use of strong CYP3A inhibitors and consider an alternative concomitant medication with no or minimal CYP3A inhibition. If patients must be coadministered a strong CYP3A inhibitor, reduce the IBRANCE dose to 75 mg once daily. If the strong inhibitor is discontinued, increase the IBRANCE dose (after 3 to 5 half-lives of the inhibitor) to the dose used prior to the initiation of the strong CYP3A inhibitor [see Drug Interactions (7.1) and Clinical Pharmacology (12.3)].

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