bupivacaine + clonidine + buprenorphine + dexamethasone

A four-drug multimodal formulation combining a long-acting local anesthetic (bupivacaine) with three adjuvants (clonidine, buprenorphine, and dexamethasone) designed for prolonged single-injection peripheral nerve blocks in regional anesthesia. This combination has been studied for its efficacy in extending the duration of analgesia and reducing postoperative pain and opioid use compared to bupivacaine alone. Laboratory studies have confirmed both chemical compatibility in solution and in vivo safety, producing reversible sensory and motor nerve blocks without causing long-term nerve damage. Research continues to explore its potential as an alternative to continuous catheter-based techniques.