Ergocalciferol is a form of vitamin D.Brand Name(s):Calcidol, Calciferol, DrisdolThere may be other brand names for this medicine.When This Medicine Should Not Be Used:You should not use this medicine if you have had an allergic reaction to vitamin D.How to Use This Medicine:Capsule, Liquid Filled Capsule, Liquid, TabletTake your medicine as directed.