Drug Interaction Report

MONITOR: Elevations in serum calcium levels have been observed in patients treated with topical vitamin D analogs. Concomitant use with systemic vitamin D products, calcium supplements, or other agents that can increase serum calcium concentrations such as thiazide diuretics, estrogens, anabolic steroids, and parathyroid hormone or parathyroid hormone analogs may increase the risk of clinically significant hypercalcemia.

MANAGEMENT: Calcium and vitamin D status should be monitored closely when topical vitamin D analogs are used in combination with systemic vitamin D products or other agents that can increase serum calcium levels.

ADJUST DOSING INTERVAL: Administration with food may increase the absorption of calcium. However, foods high in oxalic acid (spinach or rhubarb), or phytic acid (bran and whole grains) may decrease calcium absorption.

MANAGEMENT: Calcium may be administered with food to increase absorption. Consider withholding calcium administration for at least 2 hours before or after consuming foods high in oxalic acid or phytic acid.