Osteoporosis is the most prevalent metabolic bone disease and fractures are its clinical complication. We have nowadays some drugs that reduce the incidence of new fractures: Bisphosphonates. Nevertheless, treatment must be taken properly in the long run to reduce the incidence of new fractures and a few months alter starting the treatment, a great number of patients stop it because of different reasons. The introduction of new bisphosphonates that can be taken weekly or even better monthly, has improved notably the adherence and compliance to osteoporosis treatment.