Enfortumab Vedotin

⛔ FDA Black Box Warning

WARNING: SERIOUS SKIN REACTIONS • PADCEV can cause severe and fatal cutaneous adverse reactions including Stevens-Johnson syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), which occurred predominantly during the first cycle of treatment, but may occur later. • Closely monitor patients for skin reactions. • Immediately withhold PADCEV and consider referral for specialized care for suspected SJS or TEN or severe skin reactions. • Permanently discontinue PADCEV in patients with confirmed SJS or TEN; or Grade 4 or recurrent Grade 3 skin reactions [see Dosage and Administration ( 2.2 ), Warnings and Precautions ( 5.1 ), and Adverse Reactions ( 6.1 )]. WARNING: SERIOUS SKIN REACTIONS See full prescribing information for complete boxed warning. • PADCEV can cause severe and fatal cutaneous adverse reactions, including Stevens-Johnson syndrome (SJS) and Toxic Epidermal Necrolysis (TEN). • Immediately withhold PADCEV and consider referral for specialized care for suspected SJS or TEN or severe skin reactions. • Permanently discontinue PADCEV in patients with confirmed SJS or TEN; or Grade 4 or recurrent Grade 3 skin reactions. ( 2.2 ), ( 5.1 ), ( 6.1 )

Contraindications

4 CONTRAINDICATIONS None. None. ( 4 )

Pregnancy & Breastfeeding

8.1 Pregnancy Risk Summary Based on the mechanism of action and findings in animals, PADCEV can cause fetal harm when administered to a pregnant woman [see Clinical Pharmacology ( 12.1 )] . There are no available human data on PADCEV use in pregnant women to inform a drug-associated risk. In an animal reproduction study, administration of enfortumab vedotin-ejfv to pregnant rats during organogenesis caused maternal toxicity, embryo-fetal lethality, structural malformations, and skeletal anomalies at maternal exposures similar to the exposures at the recommended human dose of 1.25 mg/kg (see Data ) . Advise patients of the potential risk to the fetus. The background risk of major birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2%-4% and 15%-20%, respectively. Data Animal Data In a rat pilot embryo-fetal development study, administration of enfortumab vedotin-ejfv on gestation day 6 and 13 during the period of organogenesis resulted in a complete litter loss in all pregnant rats at the maternally toxic dose of 5 mg/kg (approximately 3 times the exposure at the recommended human dose). A dose of 2 mg/kg (similar to the exposure at the recommended human dose) resulted in maternal toxicity, embryo-fetal lethality, and structural malformations that included gastroschisis, malrotated hindlimb, absent forepaw, malpositioned internal organs, and fused cervical arch. Additionally, skeletal anomalies (asymmetric, fused, incompletely ossified, and misshapen sternebrae, misshapen cervical arch, and unilateral ossification of the thoracic centra) and decreased fetal weight were observed.