Doxercalciferol, trade name Hectorol, is a man-made form of Vitamin D. Drugs used to treat people with kidney disease when they have an increase in certain natural substances such as Parathyroid hormone (PTH). When the body increases PTH, it imbalances calcium and phosphorus minerals, leading to weak bones. The drug will work to reduce PTH and increase Calcium and Phosphorus to help balance minerals for the body. Medicines are taken as prescribed by doctors and sold in pharmacies nationwide.