THE RANGE BETWEEN THERAPEUTIC AND TOXIC DOSES IS NARROW.
VITAMIN D RESISTANT RICKETS: 12,000 TO 500,000 USP UNITS DAILY.
HYPOPARATHYROIDISM: 50,000 TO 200,000 USP UNITS DAILY CONCOMITANTLY WITH CALCIUM LACTATE 4 G, SIX TIMES PER DAY.
DOSAGE MUST BE INDIVIDUALIZED