Thermal analysis carried out on the two binary systems between lidocaine and D-camphor, on the one hand, and DL-camphor, on the other hand, has shown that both systems form eutectic mixtures which are liquid at room temperature. Since these three substances present anesthetic properties, the mixtures elaborated from them are suitable for topical anesthesia. The similar behavior of D- and DL-camphor, regarding melting and crystallographic properties, implies similar binary temperature-composition phase diagrams when they are mixed with lidocaine. (C) 2012 Elsevier B.V. All rights reserved.