Certain medications can make it harder for your body to absorb vitamin D. If you take other medications, take them at least 2 hours before or 2 hours after you take ergocalciferol.
Tell your doctor about all your other medicines, especially:
a diuretic or "water pill"; or
mineral oil (sometimes taken as a laxative).
This list is not complete. Other drugs may affect ergocalciferol, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
 Ergocalciferol drug interactions (more detail)
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