Not to be used for pernicious anaemia or other megaloblastic anaemias, severe specific deficiency. Hypercalcemia, hypercalciuria, hypoparathyroidism. Patients w/ Fe shortage or absorption diseases, haemoglobinopathies or existing GI disease. Parkinsonism. Vit B
12 deficiency. Large doses & prolonged use. Administration of corticosteroids, digitalis, tetracyclines, antacids, penicillamine, levodopa, oxalic & phytic acid & P. Renal impairment or history of renal stone formation.