Ideos 500 mg/400 IU Chewable Tablets (60). Ideos provides calcium and vitamin D3 (also called cholecalciferol) to the body.. It is used:. • in case of vitamin D and calcium deficiency in the elderly.. • in association with some treatments of osteoporosis (a condition where bone mass decreases and bone brittleness increases), when there is deficiency or a risk of deficiency in vitamin D and calcium.. Ideos is intended for use in adults.