(en) To the Editor, We investigate the physical stability of an infusion containing ropivacaine, clonidine and adrenaline tartrate, three pharmaceutical compounds usually used in operating room for loco-regional anaesthesia. The awareness of the stability of a ready-to-use mixture containing the three components could allow staff anaesthetists to inject patient only once. Moreover, the preparation in advance by a Centralised IntraVenous Admixtures Service (CIVAS) could be considered in terms of preparation quality and time management. [...]