Pristinamycin/Vitamin K Antagonists Drug Interaction: a French Pharmacovigilance Database Study

Objective. To analyse pristinamycin/vitamin K antagonists (VKA) drug interaction by using data recorded in the French pharmacovigilance database (FPVB). Methods. All cases with an increase effect of a VKA and an association with pristinamycin recorded in the FPVB between 1985 and 2013 were included. Data concerning patients, VKA treatments and side effects were recorded for a descriptive analysis. Results. During this period, 31 reports with a VKA overdose after an association with pristinamycin were included. Fluindione is the most often involved VKA (77% of cases). In 20 cases (65.4%), VKA overdose caused bleeding and 24 cases (77.4%) were serious. Conclusion. Although mechanism is unknown, pristinamycine/AVK drug interaction is a reality that needs to be reported in the summary of product characteristics of these drugs and better known by practitioners to act in patients' interest.