Effect of P-gp Inhibitors
Coadministration with P-gp inhibitors may increase talazoparib exposure.
In patients with advanced solid tumors, coadministration of a P-gp inhibitor (itraconazole) increased talazoparib plasma exposure by 56%. In the clinical studies, coadministration with P-gp inhibitors including amiodarone, carvedilol, clarithromycin, itraconazole, and verapamil resulted in an approximate 45% increase in talazoparib exposure and an increase in the rate of TALZENNA dose reduction. If coadministration of TALZENNA with these P-gp inhibitors cannot be avoided, reduce the TALZENNA dose [see Dosage and Administration (2.5)]. When the P-gp inhibitor is discontinued, increase the TALZENNA dose (after 3–5 half-lives of the inhibitor) to the dose used prior to the initiation of the P-gp inhibitor [see Dosage and Administration (2.5), Clinical Pharmacology (12.3)].
Effect of BCRP inhibitors
Coadministration with BCRP inhibitors may increase talazoparib exposure. If coadministration cannot be avoided, monitor patients for potential increased adverse reactions when coadministering [see Clinical Pharmacology (12.3)].
Based on findings from animal studies and its mechanism of action [see Clinical Pharmacology (12.1)] , TALZENNA can cause embryo-fetal harm when administered to a pregnant woman. There are no available data on TALZENNA use in pregnant women to inform a drug-associated risk. In an animal reproduction study, the administration of talazoparib to pregnant rats during the period of organogenesis caused fetal malformations and structural skeletal variations and embryo-fetal death at maternal exposures that were 0.24 times the AUC in patients receiving the recommended dose of 1 mg daily (see Data). Apprise pregnant women and females of reproductive potential of the potential risk to a fetus.
The background risk of major birth defects and miscarriage for the indicated population is unknown. In the general U.S. population, the estimated background risks of major birth defects and miscarriage in clinically recognized pregnancies are 2% to 4% and 15% to 20%, respectively.
In an embryo-fetal development toxicity study, pregnant rats received oral doses of 0.015, 0.05, and 0.15 mg/kg/day talazoparib during the period of organogenesis. Talazoparib caused embryo-fetal death at doses ≥0.015 mg/kg/day (approximately 0.24 times the AUC in patients at the recommended dose). A dose of 0.015 mg/kg/day caused decreased fetal body weights and an increased incidence of fetal malformations (depressed eye bulge, small eye, split sternebra, and fused cervical vertebral arch) and structural variations including misshapen or incomplete ossification of the sternebra, skull, rib, and vertebra.
There are no data on the presence of talazoparib in human milk, the effects of the drug on milk production, or the effects of the drug on the breastfed child. Because of the potential for serious adverse reactions in a breastfed child from talazoparib, advise lactating women not to breastfeed during treatment with TALZENNA and for at least 1 month after the final dose.
A pregnancy test is recommended for females of reproductive potential prior to initiating TALZENNA treatment.
TALZENNA can cause fetal harm when administered to pregnant women [see Use in Specific Populations (8.1)]. Advise females of reproductive potential to use effective contraception during treatment and for at least 7 months following the last dose of TALZENNA.
Based on genotoxicity and animal reproduction studies, advise male patients with female partners of reproductive potential and pregnant partners to use effective contraception during treatment with TALZENNA and for at least 4 months following the last dose [see Use in Specific Populations (8.1), Nonclinical Toxicology (13.1)].
Based on animal studies, TALZENNA may impair fertility in males of reproductive potential [see Nonclinical Toxicology (13.1)].
The safety and effectiveness of TALZENNA have not been established in pediatric patients.
In clinical trials of TALZENNA enrolling 494 patients with advanced solid tumors who received TALZENNA 1 mg daily as monotherapy, 85 (17%) patients were ≥65 years of age, and this included 19 (4%) patients who were ≥75 years old. There were 5 patients ≥85 years old. No overall differences in safety or effectiveness of TALZENNA were observed between these patients and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
Patients with moderate or severe renal impairment have a higher exposure to TALZENNA than patients with normal renal function. Reduce the recommended dose of TALZENNA in patients with moderate (CLcr 30 – 59 mL/min) and severe (CLcr 15 – 29 mL/min) renal impairment. Monitor patients with severe renal impairment for potential increased adverse reactions and adjust dosing accordingly [see Dosage and Administration (2.4), Clinical Pharmacology (12.3)]. No dose adjustment is required for patients with mild renal impairment (CLcr 60 – 89 mL/min). TALZENNA has not been studied in patients requiring hemodialysis [see Clinical Pharmacology (12.3)].
TALZENNA has not been studied in patients with moderate hepatic impairment (total bilirubin >1.5 to 3.0 × upper limit of normal [ULN] and any aspartate aminotransferase [AST]) or severe hepatic impairment (total bilirubin >3.0 × ULN and any AST). No dose adjustment is required for patients with mild hepatic impairment (total bilirubin ≤1 × ULN and AST > ULN, or total bilirubin >1.0 to 1.5 × ULN and any AST) [see Clinical Pharmacology (12.3)].
There is no specific treatment in the event of TALZENNA overdose, and symptoms of overdose have not been established. In the event of overdose, discontinue treatment with TALZENNA, consider gastric decontamination, follow general supportive measures, and treat symptomatically.
Talazoparib is an inhibitor of mammalian polyadenosine 5′-diphosphoribose polymerase (PARP) enzyme. The chemical name of talazoparib tosylate is (8S ,9R)-5-Fluoro-8-(4-fluorophenyl)-9-(1-methyl-1H -1,2,4-triazol-5-yl)-2,7,8,9-tetrahydro-3H -pyrido[4,3,2-de ]phthalazin-3-one 4-methylbenzenesulfonate (1:1). The chemical formula of talazoparib tosylate is C26 H22 F2 N6 O4 S, and the relative molecular mass is 552.56 Daltons. The chemical structure of talazoparib tosylate is shown below:
Talazoparib tosylate is a white to yellow solid. TALZENNA capsules for oral use are available as a 0.25 mg hard hypromellose (HPMC) capsule that contains 0.363 mg talazoparib tosylate equivalent to 0.25 mg talazoparib free base or as a 1 mg HPMC capsule that contains 1.453 mg talazoparib tosylate equivalent to 1 mg talazoparib free base.
Inactive ingredients: silicified microcrystalline cellulose (sMCC). The white/ivory and white/light red opaque capsule shells contain HPMC, yellow iron oxide, red iron oxide and titanium dioxide; and the printing ink contains shellac, black iron oxide, potassium hydroxide, ammonium hydroxide, and propylene glycol.
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