There is no evidence of clinical effectiveness to recommend for or against calcitonin in order to prevent osteoporotic fractures in the elderly. Although there are specific clinical situations in which calcitonin could be given, in view of its high cost and the poor quality of the evidence analyzed, the Catalan Agency for Health Technology Assessment states that, currently, unselective prescription for osteoporosis cannot be recommended. According to the US Preventive Task Force coding system, this represents a "C" recommendation.