Gilteritinib (Systemic)
Brand names: Xospata
Drug class:
Antineoplastic Agents
Usage of Gilteritinib (Systemic)
Acute Myeloid Leukemia (AML)
For the treatment of adults with relapsed or refractory AML harboring Flt-3 mutation (designated an orphan drug by FDA for this use).
FDA-approved companion diagnostic test (e.g., LeukoStrat CDx Flt-3 mutation assay) required to cOnfirm presence of Flt-3 mutation prior to initiation of therapy.
Safety and efficacy of gilteritinib in this use is based principally on the results of a phase 3, open-label, controlled trial in adults with relapsed or refractory AML with an internal tandem duplication (ITD) or a point mutation in the tyrosine kinase domain (TKD) of Flt-3 kinase.
The National Cancer Institute states there is no standard treatment regimen for relapsed or refractory AML; patients who are unable or unwilling to undergo intensive therapy may be candidates for reduced-intensity therapies, including gilteritinib.
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How to use Gilteritinib (Systemic)
General
Pretreatment Screening
Patient Monitoring
Dispensing and Administration Precautions
Administration
Oral Administration
Administer orally once daily without regard to meals. Take at approximately the same time each day.
Swallow tablets whole with water; do not chew, crush, or break.
If a dose of gilteritinib is missed by ≤12 hours, take the prescribed dose as soon as possible and take the next dose at the regularly scheduled time on the following day. If a dose is missed by >12 hours, administer prescribed dose at the next scheduled time; do not administer an additional dose to replace the missed dose. Do not take 2 doses within a 12-hour period.
Dosage
Available as gilteritinib fumarate; dosage expressed in terms of gilteritinib.
Adults
AML Oral120 mg once daily. Continue therapy for ≥6 months to allow time for response or until disease progression or unacceptable toxicity occurs.
Dosage Modification for Toxicity Differentiation Syndrome OralIf differentiation syndrome is suspected, administer systemic corticosteroids and initiate hemodynamic monitoring until symptoms resolve and for a minimum of 3 days.
Interrupt treatment with gilteritinib if severe signs and/or symptoms continue for >48 hours after initiation of corticosteroids. Resume gilteritinib when signs and symptoms improve to grade 2 (i.e., moderate) or lower.
Posterior Reversible Encephalopathy Syndrome OralIf posterior reversible encephalopathy syndrome occurs, discontinue therapy.
Prolongation of QT Interval OralIf corrected QT (QTc) interval >500 msec occurs, withhold gilteritinib therapy; resume therapy at reduced dosage of 80 mg daily when QTc interval improves to ≤480 msec or ≤30 msec from baseline.
If QTc interval increase of >30 msec from baseline on day 8 of cycle 1 occurs, confirm with ECG on day 9. If QTc interval increase is confirmed on day 9, consider reduced dosage of 80 mg daily.
Pancreatitis OralIf pancreatitis occurs, withhold gilteritinib therapy; resume therapy at reduced dosage of 80 mg daily when pancreatitis resolves.
Other Toxicity OralIf other grade 3 or 4 adverse reaction occurs, withhold gilteritinib therapy; resume therapy at reduced dosage of 80 mg daily when toxicity improves to grade 1 or less.
Special Populations
Geriatric Patients
No specific dosage recommendations at this time.
Hepatic Impairment
No specific dosage recommendations at this time.
Renal Impairment
No specific dosage recommendations at this time.
Warnings
Contraindications
Warnings/Precautions
Warnings
Differentiation SyndromeBoxed warning regarding the risks of differentiation syndrome, which can be fatal or life-threatening if untreated. In clinical trials, 3% of patients experienced differentiation syndrome; 82% recovered after treatment or dose interruption of gilteritinib. If differentiation syndrome suspected, initiate corticosteroid therapy with Dexamethasone 10 mg IV every 12 hours (or equivalent dose of alternative oral or IV corticosteroid) and hemodynamic monitoring until symptom resolution. Following symptom resolution, taper corticosteroids and administer corticosteroids for a minimum of 3 days. Symptoms of differentiation syndrome may recur if corticosteroid treatment is prematurely discontinued. If severe signs and/or symptoms continue for more than 48 hours after corticosteroid initiation, interrupt gilteritinib until signs and symptoms are no longer severe.
Other Warnings/Precautions
Posterior Reversible Encephalopathy Syndrome
Posterior reversible encephalopathy syndrome reported rarely; may manifest as seizure and altered mental status. Brain imaging, preferably MRI, necessary to confirm diagnosis. Manifestations may resolve following discontinuance of therapy. If posterior reversible encephalopathy syndrome occurs, discontinue gilteritinib.
Prolongation of QT Interval
QTc interval prolongation reported.
Monitor ECG prior to initiation of gilteritinib, on days 8 and 15 of cycle 1, and prior to initiation of cycles 2 and 3.
Monitor serum electrolytes (e.g., potassium, magnesium) prior to initiation of gilteritinib therapy and at least weekly for the first month of therapy, every other week for the following month of therapy, and then monthly thereafter. Correct hypokalemia and hypomagnesemia prior to initiation of and during gilteritinib therapy.
If QTc interval prolongation occurs, temporary interruption and/or dosage reduction of gilteritinib may be necessary.
Pancreatitis
Pancreatitis reported in 4% of patients in clinical trials. Evaluate patients who develop manifestations of pancreatitis (e.g., severe and persistent abdominal pain, which may be accompanied by nausea or vomiting). If pancreatitis occurs, temporary interruption followed by dosage reduction may be necessary.
Fetal/Neonatal Morbidity and Mortality
May cause fetal harm based on mechanism of action and animal findings; embryofetal toxicity and teratogenicity demonstrated in animals.
Placental transfer of gilteritinib observed in rats.
Confirm pregnancy status within 7 days prior to initiating gilteritinib therapy. Avoid pregnancy during therapy. Advise females of reproductive potential to use effective methods of contraception while receiving the drug and for ≥6 months after the drug is discontinued. Advise male patients who are partners of such females to use effective methods of contraception while receiving the drug and for ≥4 months after drug is discontinued. If used during pregnancy, apprise of potential fetal hazard.
Specific Populations
PregnancyMay cause fetal harm.
Confirm pregnancy status within 7 days prior to initiating gilteritinib therapy.
LactationGilteritinib and/or its metabolite(s) distribute into milk in rats. Not known whether the drug or its metabolites distribute into human milk or if drug affects milk production or the nursing infant. Advise patients not to breast-feed during therapy and for ≥2 months following drug discontinuance.
Females and Males of Reproductive PotentialEffect on fertility in humans is unknown; based on animal studies, may impair male fertility . Advise females of reproductive potential to use effective contraception during treatment and for 6 months after the last dose of gilteritinib. Advise males of reproductive potential to use effective contraception during treatment and for 4 months after the last dose of gilteritinib.
Pediatric UseSafety and efficacy not established.
Geriatric UseIn clinical trials in patients with relapsed or refractory AML, no overall differences observed in safety and efficacy relative to younger adults.
Hepatic ImpairmentIn a hepatic impairment study, systemic exposure of unbound gilteritinib not altered by mild or moderate hepatic impairment (Child-Pugh class A or B) in noncancer patients.
Effects of severe hepatic impairment (Child-Pugh class C) on pharmacokinetics not established.
Renal ImpairmentIn a population pharmacokinetic analysis, systemic exposure not substantially altered by changes in Scr concentrations in patients with relapsed or refractory AML.
Mild or moderate renal impairment (Clcr 30–80 mL/minute) not expected to have clinically important effects on systemic exposure of the drug.
Effects of severe renal impairment (Clcr ≤29 mL/minute) on pharmacokinetics not established.
Common Adverse Effects
Adverse effects occurring in ≥20% of patients with relapsed or refractory AML receiving gilteritinib include increased transaminase, myalgia/arthralgia, fatigue/malaise, fever, mucositis, edema, rash, noninfectious diarrhea, dyspnea, nausea, cough, constipation, eye disorders, headache, dizziness, hypotension, vomiting, and renal impairment.
What other drugs will affect Gilteritinib (Systemic)
Principally metabolized by CYP3A4.
Weak inhibitor of CYP3A4.
Substrate of P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP). Potent inhibitor of multidrug and toxin extrusion (MATE) transporter 1 and organic cation transporter (OCT) 2; inhibits BCRP, P-gp, and OCT 1.
Drugs Affecting Hepatic Microsomal Enzymes and/or Efflux Transport Systems
Potent CYP3A inhibitors: Possible increased gilteritinib exposure. Avoid concomitant use; consider alternative agent with less CYP3A inhibition potential. If concomitant use cannot be avoided, monitor frequently for signs of toxicity; may need to interrupt therapy and reduce dosage if serious or life-threatening adverse effects occur.
Combined P-gp and potent CYP3A inducers: Possible decreased gilteritinib exposure and reduced gilteritinib efficacy. Avoid concomitant use.
Drugs Metabolized by Hepatic Microsomal Enzymes
CYP3A substrates: Possible increased exposure of the CYP3A substrate.
Drugs Affected by Multidrug and Toxin Extrusion Transporter
MATE1 substrates: Possible decreased exposure of the MATE1 substrate.
Drugs that Interact with Serotonin Type 2B Receptor or Nonspecific σ-receptors
Possible pharmacokinetic interaction (reduced efficacy of drugs that bind to 5-HT2B or nonspecific σ-receptors). Avoid concomitant use unless such use is necessary.
Substrates of P-gp, BCRP, and OCT1
Coadministration of gilteritinib may increase exposure of P-gp, BCRP, and OCT1 substrates. For P-gp, BCRP, or OCT1 substrates where small concentration changes may lead to serious adverse reactions, decrease the dose or modify the dosing frequency of substrate and monitor for adverse reactions as recommended in the respective prescribing information.
Specific Drugs
Drug
Interaction
Comments
Antidepressants, SSRIs (e.g., escitalopram, fluoxetine, Sertraline)
Possible reduced efficacy of SSRI
Drugs that interact with 5-HT2B or nonspecific σ-receptors: Avoid concomitant use unless considered essential
Antifungals, azoles (e.g., fluconazole, itraconazole)
Fluconazole: Increased peak plasma concentrations and AUC of gilteritinib by approximately 16 and 40%, respectively
Itraconazole: Increased peak plasma concentrations and AUC of gilteritinib by approximately 20 and 120%, respectively
Potent CYP3A inhibitors (e.g., itraconazole): Consider alternative antifungal with less CYP3A inhibition potential; if concomitant use cannot be avoided, monitor frequently for toxicity and interrupt therapy and reduce dosage if serious or life-threatening toxicity occurs
Decreased peak plasma concentrations and AUC of cephalexin by <10%
Midazolam
Increased peak plasma concentrations and AUC of midazolam by approximately 10%
Rifampin
Possible reduced gilteritinib efficacy
Decreased peak plasma concentrations and AUC of gilteritinib by approximately 30 and 70%, respectively
Avoid concomitant use
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