Safety and efficacy of long-term use of a buprenorphine transdermal patch system in patients with osteoarthritis and low back pain refractory to non-opioid analgesics: Post-marketing surveillance of 3000 cases.

Objectives: A post-marketing surveillance was conducted to evaluate the safety and efficacy of the buprenorphine transdermal patch under actual clinical practice.

Results: Of the 3017 patients included in the safety analysis, adverse drug reactions (ADRs) were observed in 1524 (50.5%), the most common being nausea, skin symptoms at the site of application, constipation, and vomiting.