1. What Aristocal® D is and what it is used for? Aristocal® D is a combined preparation of Calcium and Vitamin D (Cholecalciferol) specially designed to promote bone health. 2. Before you take Aristocal® D Do not take this medicine and tell your doctor if: Aristocal® D is contraindicated in patients who have known hypersensitivity to any of the components of this preparation. Taking other medicines Concurrent administration of Thiazide diuretics may increase the risk of hypercalcemia. Bran decreases the gastro-intestinal absorption of calcium, and may therefore decrease the efficacy of calcium supplements. Calcium salts reduce the absorption of a number of other drugs such as Biphosphonates, Fluoride, some Fluoroquinolones and Tetracyclines. Pregnancy and breast-feeding Aristocal® D should be used considering the risk benefit ratio.