Overview Study of the Efficacy and Safety of Bupivacaine TTS Patch in Patients With Chronic Low Back Pain Status: Completed Trial end date: 2011-02-01 Target enrollment: Participant gender: Summary This study will evaluate the efficacy and safety of Bupivacaine TTS (Bupivacaine patch) compared to placebo in patients with chronic low back pain. Phase: Phase 2 Details Lead Sponsor: PfizerCollaborator: DurectTreatments: Bupivacaine