One-Alpha 2 mcg/mL Oral Drops contain alfacalcidol, a vitamin D analogue used to manage calcium and phosphate imbalances, particularly in patients with chronic kidney disease. Each pack contains 20 mL./Description: One-Alpha (alfacalcidol) is a vitamin D analogue that helps regulate calcium and phosphate levels in the body. It is commonly prescribed for the management of hypocalcemia, secondary hyperparathyroidism, and osteodystrophy in patients with chronic renal failure, as well as certain types of rickets and osteomalacia.. Please Note that product description, color, ingredients, package and other information maybe different from the original pack kindly check the product for more accurate details.