Longterm Safety Study of BEMA Buprenorphine in Subjects With Chronic Pain

Inclusion Criteria: * Male or non-pregnant and non-nursing female aged 18 or older * History of moderate to severe chronic pain: 1. Subjects completing study BUP-301 (low back pain) or 2. Osteoarthritis or neuropathic pain, or subjects not completing study BUP-301 (low back pain), pain for ≥3 months with a pain intensity ≥5 \[11 point NRS\] reported at the titration period Day 0/1 visit following a washout period (opioids, NSAIDs, and muscle relaxants) of approximately 12 to 24 hours AND currently taking ≤60 mg oral morphine equivalent/day (including opioid-naïve) for 1 week or longer * Stable health, as determined by the Investigator, on the basis of medical history, physical examination, and laboratory results so as to comply with all study procedures * Female subjects of childbearing potential must be using a recognized effective method of birth control * Written informed consent obtained prior to any procedure being performed Exclusion Criteria: * Cancer related pain * Reflex sympathetic dystrophy or causalgia (complex regional pain syndrome), acute spinal cord compression, cauda equina compression, acute nerve root compression, meningitis, or discitis * Surgical procedure for pain within 2 months, or nerve/plexus block within 4 weeks, prior to titration period Day 0/1 visit * History of severe emesis with opioids * Clinically significant sleep apnea in the judgment of the investigator