ETOPOSIDE Drug Interactions: What You Need to Know

INTERACTIONS CYP3A Inhibitors and CYP3A Inducers : Avoid concomitant use of strong CYP3A inhibitors and strong CYP3A inducers with AVOPEF. ( 7.1 ) Vitamin K Antagonists : Monitor INR more frequently and modify the dosage of the vitamin K antagonists as appropriate. Co-administration of AVOEPF with warfarin can result in elevated international normalized ratio (INR). ( 7.2 )

7.1 Effect of Other Drugs on AVOPEF CYP3A Inhibitors Avoid concomitant use of strong CYP3A inhibitors. Etoposide is a CYP3A4 substrate. Strong CYP3A inhibitors may increase etoposide exposure, which may increase the risk of AVOPEF-associated adverse reactions <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span>. CYP3A Inducers Avoid concomitant use of strong CYP3A inducers. Etoposide is a CYP3A4 substrate. Strong CYP3A inducers may reduce etoposide exposure, which may decrease the effectiveness of AVOPEF <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span>.

7.2 Effect of AVOPEF on Other Drugs Vitamin K Antagonists Monitor INR more frequently and modify the dosage of the vitamin K antagonists as appropriate. Co-administration of AVOEPF with warfarin can result in elevated international normalized ratio (INR).

ETOPOPHOS is contraindicated in patients with a history of a severe hypersensitivity reaction to etoposide products [see Warnings and Precautions (5.3) ] . Hypersensitivity to etoposide products. ( 4 , 5.3 )

WARNINGS: Patients being treated with etoposide must be frequently observed for myelosuppression both during and after therapy. Myelosuppression resulting in death has been reported. Dose-limiting bone marrow suppression is the most significant toxicity associated with etoposide therapy. Therefore, the following studies should be obtained at the start of therapy and prior to each subsequent cycle of etoposide: platelet count, hemoglobin, white blood cell count, and differential. The occurrence of a platelet count below 50,000/mm 3 or an absolute neutrophil count below 500/mm 3 is an indication to withhold further therapy until the blood counts have sufficiently recovered. Physicians should be aware of the possible occurrence of an anaphylactic reaction manifested by chills, fever, tachycardia, bronchospasm, dyspnea, and hypotension. Higher rates of anaphylactic-like reactions have been reported in children who received infusions at concentrations higher than those recommended. The role that concentration of infusion (or rate of infusion) plays in the development of anaphylactic-like reactions is uncertain (see ADVERSE REACTIONS ). Treatment is symptomatic. The infusion should be terminated immediately, followed by the administration of pressor agents, corticosteroids, antihistamines, or volume expanders at the discretion of the physician. For parenteral administration, Etoposide Injection, USP should be given only by slow intravenous infusion (usually over a 30- to 60-minute period) since hypotension has been reported as a possible side effect of rapid intravenous injection.

Pregnancy

Etoposide can cause fetal harm when administered to a pregnant woman. Etoposide has been shown to be teratogenic in mice and rats. In rats, an intravenous etoposide dose of 0.4 mg/kg/day (about 1/20th of the human dose on a mg/m 2 basis) during organogenesis caused maternal toxicity, embryotoxicity, and teratogenicity (skeletal abnormalities, exencephaly, encephalocele, and anophthalmia); higher doses of 1.2 and 3.6 mg/kg/day (about 1/7th and 1/2 of human dose on a mg/m 2 basis) resulted in 90 and 100% embryonic resorptions. In mice, a single 1 mg/kg (1/16th of human dose on a mg/m 2 basis) dose of etoposide administered intraperitoneally on days 6, 7, or 8 of gestation caused embryotoxicity, cranial abnormalities, and major skeletal malformations. An I.P. dose of 1.5 mg/kg (about 1/10th of human dose on a mg/m 2 basis) on day 7 of gestation caused an increase in the incidence of intrauterine death and fetal malformations and a significant decrease in the average fetal body weight. Women of childbearing potential should be advised to avoid becoming pregnant. If this drug is used during pregnancy, or if the patient becomes pregnant while receiving this drug, the patient should be warned of the potential hazard to the fetus. Etoposide should be considered a potential carcinogen in humans. The occurrence of acute leukemia with or without a preleukemic phase has been reported in rare instances in patients treated with etoposide alone or in association with other neoplastic agents. The risk of development of a preleukemic or leukemic syndrome is unclear. Carcinogenicity tests with etoposide have not been conducted in laboratory animals.

Pregnancy

Etoposide can cause fetal harm when administered to a pregnant woman. Etoposide has been shown to be teratogenic in mice and rats. In rats, an intravenous etoposide dose of 0.4 mg/kg/day (about 1/20th of the human dose on a mg/m 2 basis) during organogenesis caused maternal toxicity, embryotoxicity, and teratogenicity (skeletal abnormalities, exencephaly, encephalocele, and anophthalmia); higher doses of 1.2 and 3.6 mg/kg/day (about 1/7th and 1/2 of human dose on a mg/m 2 basis) resulted in 90 and 100% embryonic resorptions. In mice, a single 1 mg/kg (1/16th of human dose on a mg/m 2 basis) dose of etoposide administered intraperitoneally on days 6, 7, or 8 of gestation caused embryotoxicity, cranial abnormalities, and major skeletal malformations. An I.P. dose of 1.5 mg/kg (about 1/10th of human dose on a mg/m 2 basis) on day 7 of gestation caused an increase in the incidence of intrauterine death and fetal malformations and a significant decrease in the average fetal body weight. Women of childbearing potential should be advised to avoid becoming pregnant. If this drug is used during pregnancy, or if the patient becomes pregnant while receiving this drug, the patient should be warned of the potential hazard to the fetus. Etoposide should be considered a potential carcinogen in humans. The occurrence of acute leukemia with or without a preleukemic phase has been reported in rare instances in patients treated with etoposide alone or in association with other neoplastic agents. The risk of development of a preleukemic or leukemic syndrome is unclear. Carcinogenicity tests with etoposide have not been conducted in laboratory animals.