J Intern Med. 2008 Oct;264(4):315-32. Boonen S, Vanderschueren D, Venken K, Milisen K, Delforge M, Haentjens P.
Bisphosphonates are the current mainstay of treatment for postmenopausal osteoporosis. Although daily oral dosing is effective, it is associated with poor compliance, partly because of the pre and postdose fasting and posture requirements. This negatively impacts treatment outcomes, leading to a reduced clinical benefit. Improved, yet still suboptimal adherence has been noticed with less frequent bisphosphonate dosing e.g. once-weekly and once-monthly oral regimens. The recently approved quarterly intravenous (i.v.) injection regimen of ibandronate and yearly i.v. infusion of zoledronic acid are attractive options in the management of postmenopausal osteoporosis. These regimens may assure quarterly and year long compliance.