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 Calcium Brand name:- calcinol, cipcal ,M ilical, Calcium sandoze, Shelcal ,  Macalvit . Calcium is a mineral found in over-the-counter supplements or prescription formulations used for the treatment of specific medical conditions related to calcium deficiency.  PREPARATION:-  1. Calcium carbonate (40% Ca) : It is an insoluble, tasteless and nonirritating salt. Reacts with gastric HCL  to form cholride, and can be used as antacid. It is the most common salt present in calcium supplements, but gastric acid is required for  converting it into the absorbable form . Calcium availability from it is poor in patients taking proton pump inhibitors (PPIs) ,H² blocker, and in elderly. 2.  Calcium citrate ( as tetrahydrate , 21% Ca²+ ) : Slightly soluble in water, but dissolve well in presence of HCL . It is nonirritating and is used in supplements; absorption in patients taking PPIs/H² blocker and elderly is satisfactory. 3. Calcium gluconate (9% Ca) : is availa...