Calcitriol Capsules 0.25 mcg are active vitamin D supplements essential for maintaining calcium and phosphate balance in the body. They are used primarily to treat calcium deficiencies due to chronic kidney disease, hypoparathyroidism, and certain bone disorders. By enhancing intestinal calcium absorption and supporting bone mineralization, calcitriol helps prevent complications like osteomalacia and renal osteodystrophy. Careful dosing and monitoring are necessary to avoid side effects such as hypercalcemia.