List of products in the National Drug Code with proprietary name . This medication is used to treat people with serious kidney disease on dialysis who have high levels of a certain substance (parathyroid hormone-PTH), which your body normally makes. High PTH levels affect the balance of other minerals in your body (calcium and phosphorus) and may cause weak bones. Doxercalciferol is a form of vitamin D. It works by decreasing PTH levels and increasing calcium/phosphorus levels in the body.