Overview EXPAREL® for Pain After Tonsillectomy Status: Completed Trial end date: 2016-05-01 Target enrollment: Participant gender: Summary The purpose of this study is to determine whether liposomal bupivacaine (long acting injectable anesthetic) provides greater post operative pain relief compared to the standard post operative pain regiment for tonsillectomy patients. Phase: Phase 4 Details Lead Sponsor: Mayo ClinicTreatments: Bupivacaine