8.1Pregnancy Risk Summary
Limited data from postmarketing experience with azelastine hydrochloride and fluticasone propionate nasal spray in pregnant women have not identified any drug associated risks of miscarriage, birth defects, or other adverse maternal or fetal outcomes. The individual components of azelastine hydrochloride and fluticasone propionate nasal spray have been marketed for decades. While the data regarding the use of nasal preparations of fluticasone propionate in pregnancy are limited, data from clinical studies of inhaled fluticasone propionate do not indicate an increased risk of adverse maternal or fetal outcomes.
Animal reproduction studies with azelastine hydrochloride and fluticasone propionate nasal spray are not available; however, studies are available with its individual components, azelastine hydrochloride and fluticasone propionate. In animal reproduction studies, there was no evidence of fetal harm in animals at oral doses of azelastine hydrochloride approximately 10 times the clinical daily dose. Oral administration of azelastine hydrochloride to pregnant mice, rats, and rabbits, during the period of organogenesis, produced developmental toxicity that included structural abnormalities, decreased embryo-fetal survival, and decreased fetal body weights at doses 530 times and higher than the maximum recommended human daily nasal dose (MRHDID) of 0.548 mg.
However, the relevance of these findings in animals to pregnant women was considered questionable based upon the high animal to human dose multiple. In animal reproduction studies, fluticasone propionate administered via nose-only inhalation to rats decreased fetal body weight, but did not induce teratogenicity at a maternal toxic dose less than the MRHDID on a mcg/m 2 basis. Teratogenicity, characteristic of corticosteroids, decreased fetal body weight and/or skeletal variations, in rats, mice, and rabbits were observed with subcutaneously administered maternal toxic doses of fluticasone propionate less than the MRHDID of 200 mcg on a mcg/m 2 basis (see Data).
Experience with corticosteroids suggests that rodents are more prone to teratogenic effects from corticosteroids than humans. The estimated background risk of major birth defects and miscarriage for the indicated populations is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.
Data Animal Data : Azelastine Hydrochloride: In an embryo-fetal development study in mice dosed during the period of organogenesis, azelastine hydrochloride caused embryo-fetal death, structural abnormalities (cleft palate; short or absent tail; fused, absent or branched ribs), delayed ossification, and decreased fetal weight at approximately 610 times the MRHDID in adults (on a mg/m 2 basis at a maternal oral dose of 68.6 mg/kg/day), which also caused maternal toxicity as evidenced by decreased maternal body weight.
Neither fetal nor maternal effects occurred in mice at approximately 25 times the MRHDID in adults (on a mg/m 2 basis at a maternal oral dose of 3 mg/kg/day). In an embryo-fetal development study in pregnant rats dosed during the period of organogenesis from gestation days 7 to 17, azelastine hydrochloride caused structural abnormalities (oligo-and brachydactylia), delayed ossification, and skeletal variations, in the absence of maternal toxicity, at approximately 530 times the MRHDID in adults (on a mg/m 2 basis at a maternal oral dose of 30 mg/kg/day).
Azelastine hydrochloride caused embryo-fetal death and decreased fetal weight and severe maternal toxicity at approximately 1,200 times the MRHDID (on a mg/m 2 basis at a maternal oral dose of 68.6 mg/kg/day). Neither fetal nor maternal effects occurred at approximately 55 times the MRHDID (on a mg/m 2 basis at a maternal oral dose of 3 mg/kg/day). In an embryo-fetal development study in pregnant rabbits dosed during the period of organogenesis from gestation days 6 to 18, azelastine hydrochloride caused abortion, delayed ossification and decreased fetal weight and severe maternal toxicity at approximately 1,100 times the MRHDID in adults (on a mg/m 2 basis at a maternal oral dose of 30 mg/kg/day).
Neither fetal nor maternal effects occurred at approximately 10 times the MRHDID (on a mg/m 2 basis at a maternal oral dose of 0.3 mg/kg/day). In a prenatal and postnatal development study in pregnant rats dosed from late in the gestation period and through the lactation period from gestation day 17 through lactation day 21, azelastine hydrochloride produced no adverse developmental effects on pups at maternal doses up to approximately 530 times the MRHDID (on mg/m 2 basis at a maternal dose of 30 mg/kg/day).
Fluticasone Propionate: In embryofetal development studies with pregnant rats and mice dosed by the subcutaneous route throughout the period of organogenesis, fluticasone propionate was teratogenic in both species. Omphalocele, decreased body weight, and skeletal variations were observed in rat fetuses, in the presence of maternal toxicity, at a dose approximately 5 times the MRHDID (on a mg/m 2 basis with a maternal subcutaneous dose of 100 mcg/kg/day).
Neither fetal nor maternal effects occurred in rats at approximately 1 times the MRHDID (on a mg/m 2 basis with a maternal subcutaneous dose of 30 mcg/kg/day). Cleft palate and fetal skeletal variations were observed in mouse fetuses at a dose approximately 1 times the MRHDID (on a mg/m 2 basis with a maternal subcutaneous dose of 45 mcg/kg/day). Neither fetal nor maternal effects occurred in mice with a dose approximately 0.4 times the MRHDID (on a mg/m 2 basis with a maternal subcutaneous dose of 15 mcg/kg/day).
In an embryofetal development study with pregnant rats dosed by the nose-only inhalation route throughout the period of organogenesis, fluticasone propionate produced decreased fetal body weights and skeletal variations, in the presence of maternal toxicity, at a dose approximately 1 times the MRHDID (on a mg/m 2 basis with a maternal nose-only inhalation dose of 25.7 mcg/kg/day); however, there was no evidence of teratogenicity.
Neither fetal nor maternal effects occurred in rats with a dose approximately 0.25 times the MRHDID (on a mg/m 2 basis with a maternal nose-only inhalation dose of 5.5 mcg/kg/day). In an embryofetal development study in pregnant rabbits that were dosed by the subcutaneous route throughout organogenesis, fluticasone propionate produced reductions of fetal body weights, in the presence of maternal toxicity, at doses approximately 0.06 times the MRHDID and higher (on a mg/m 2 basis with a maternal subcutaneous dose of 0.57 mcg/kg/day).
Teratogenicity was evident based upon a finding of cleft palate for 1 fetus at dose approximately 0.4 times the MRHDID (on a mg/m 2 basis with a maternal subcutaneous dose of 4 mcg/kg/day). Neither fetal nor maternal effects occurred in rabbits with a dose approximately 0.01 times the MRHDID (on a mg/m 2 basis with a maternal subcutaneous dose of 0.08 mcg/kg/day). Fluticasone propionate crossed the placenta following subcutaneous administration to mice and rats and oral administration to rabbits.
In a pre- and post-natal development study in pregnant rats dosed from late gestation through delivery and lactation (Gestation Day 17 to Postpartum Day 22), fluticasone propionate was not associated with decreases in pup body weight, and had no effects on developmental landmarks, learning, memory, reflexes, or fertility at doses up to 2 times the MRHDID (on a mg/m 2 basis with maternal subcutaneous doses up to 50 mcg/kg/day).
