Patent ID: 8093261

Claim:
A formulation for administration of an effective amount of analgesic anesthetic to an animal to provide pain relief over a period of between two days and nine days, consisting essentially of a lipophilic carrier consisting of a sterol and fatty acid ester, and an analgesic selected from the group consisting of local anesthetics, opioids, fentanyl, and butorphanol, wherein the analgesic is uniformly distributed in the carrier in a loading of 0.1 to 50% by weight, and the formulation is in the form of a dry powder, dispersion or pellets or tablets compressed from dry powder or extruded and less than five mm in length or diameter, wherein the formulation releases analgesic to provide clinically significant levels of analgesia for a period of between two and nine days and wherein release of analgesic is at least 92% complete over a period of between two and nine days.