Doxercalciferol, the active ingredient in Hectorol® (doxercalciferol liquid filled capsule) , is a synthetic vitamin D2 analog that undergoes metabolic activation in vivo to form l?,25-dihydroxyvitamin D2 (l?,25-(OH)2D2), a naturally occurring, biologically active form of vitamin D2. Hectorol (doxercalciferol liquid filled capsule) is available as soft gelatin capsules containing 0.5 mcg, 1 mcg or 2.5 mcg doxercalciferol. Each capsule also contains fractionated triglyceride of coconut oil, ethanol, and butylated hydroxyanisole (BHA). The capsule shells contain gelatin, glycerin and titanium dioxide. In addition, the 0.5 mcg capsule shells contain yellow iron oxide and FD&C Red No. 40, the 1 mcg capsule shells contain FD&C Yellow No. 6, and the 2.5 mcg capsule shells contain yellow iron oxide.

Doxercalciferol, the active ingredient in Hectorol (doxercalciferol injection) , is a synthetic vitamin D2 analog that undergoes metabolic activation in vivo to form 1?,25-dihydroxyvitamin D2 (1?,25-(0H)2D2), a naturally occurring, biologically active form of vitamin D2. Hectorol (doxercalciferol injection) is available as a sterile, clear, colorless aqueous solution for intravenous injection. Mectorol Injection is supplied as either 4 mcg/2mL or 2 mcg/mL each in a stoppered, single use 2 mL amber glass vial, with an aluminum seal and yellow (4 mcg/2mL) or green (2 mcg/mL) flip-off cap. Each milliliter (mL) of solution contains doxercalciferol, 2 meg; ethanol, 100%, 0.05 mL; Polysorbate 20,10 mg; sodium chloride, 1.5 mg; butylated hydroxytoluene, 0.02 mg; sodium phosphate dibasic, heptahydrate, 14.4 mg; sodium phosphate monobasic, monohydrate, 1.8 mg; and disodium edetate, 1.1 mg.