Calcitriol (topical)

8.1 Pregnancy Risk Summary Available data from pregnancies that occurred during the clinical development of VECTICAL Ointment and published case series of oral and intravenous calcitriol use in pregnant women have not identified a drug associated risk for major birth defects, miscarriages, or adverse maternal or fetal outcomes. In animal reproduction studies, topical administration of calcitriol to pregnant rabbits during the period of organogenesis resulted in an increased incidence of fetal deaths, as well as an increased incidence of minor skeletal abnormalities (see Data) .

The available data do not allow the calculation of relevant comparisons between the systemic exposures of calcitriol observed in animal studies to the systemic exposures that would be expected in humans after topical use of VECTICAL Ointment. The background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.

Data Animal Data Embryo-fetal development studies with calcitriol were performed in which rats were treated orally at dosages up to 0.9 mcg/kg/day (5.4 mcg/m 2 /day) and in which rabbits received topical application of calcitriol ointment (3 ppm) to 6.4% of the body surface area. No effects on reproductive or fetal parameters were observed in rats. In rabbits, topically applied calcitriol induced a significantly elevated mean post-implantation loss and an increased incidence of minor skeletal abnormalities due to delayed ossification of the pubic bones. A slightly increased incidence of skeletal variation (extra 13th rib, reduced ossification of epiphyses) was also observed.

These effects may have been secondary to maternal toxicity.