5,000 IU: Phosphate infusion, cardiac glycosides, benzothiadiazine derivative (thiazide diuretics), vit D metabolite or analogue. Anticonvulsants ie, phenytoin, phenobarb, primidone. Rifampicin. Drugs may cause lipid malabsorption ie, orlistat, liqd paraffin, cholestyraime. Cytotoxic drugs, actinomycin, imidazole. Concomitant use w/ glucocorticoid, multivit & minerals (vit A, D, E, K, folic acid, Fe), calcitonin, etidronate, gallium nitrate, pamidronate, or plicamycin. Al hydroxide, cardiac glycoside, Mg salt, sucralfate, vit D analogue. Ca salt, conivaptan. Aripiprazole, axitinib, saxagliptin. Bile acid sequestrant, systemic corticosteroids, CYP3A4 inducers, deferasirox, mineral oil, orlistat, sevelamer, tocilizumab, hydantoin, barbiturate, primidone.