Any member of a group of drugs that reversibly inhibit the propagation of signals along nerves. Wide variations in potency, stability, toxicity, water-solubility and duration of action determine the route used for administration, e.g. topical, intravenous, epidural or spinal block.
An amide-type local anaesthetic, levobupivacaine has a longer duration of action and is associated with less vasodilation than racemic bupivacaine, but is approximately 13% less potent (by molarity). It is commonly used as the hydrochloride salt.