Potential protective effect of zoledronic acid when switching from long-term therapy of osteoporosis with denosumab

Abstract

In accordance with the data of the Federal Clinical Recommendations for the Diagnosis, Treatment and Prevention of Osteoporosis, with the latter, antiresorptive drugs (denosumab, bisphosphonates) are used, which mainly suppress bone resorption, and anabolic compounds (teriparatide), which enhance bone formation. The vector of their pharmacological effect helps to prevent BMD loss and significantly reduces the risk of low-energy vertebral fractures and fractures of other localizations. The experience of clinical trials makes it possible to successfully carry out antiresorptive therapy with some drugs (denosumab) for up to 10 years, demonstrating good adherence and tolerance. Bisphosphonates remain in the bone matrix for a long time and are characterized by a period of a certain aftereffect. Denosumab and teriparatide show their effect only during the period of direct use. According to some data, when denosumab therapy is canceled in a situation where the targeted goal is achieved, the incidence of vertebral fractures increases, especially in patients with a history of low-traumatic fractures. The article will present the main provisions of the European Calcified Tissues Society, the European Medical Agency, the Russian Association for Osteoporosis regarding the timing of treatment and an analysis of clinical situations requiring the appointment of alternative antiresorptive therapy. According to the resolution of the Council of Experts of the Russian Association on Osteoporosis, bisphosphonates are recommended for all patients to prevent an increased risk of vertebral fractures 6 months after patients had their last subcutaneous injection of denosumab. Oral bisphosphonates should be taken immediately, and zoledronic acid injection should be delayed for another 65 days following a missed denosumab injection.