Abstract
Given the negative impact of opioid use on population health, prescriptions for alternative pain-relieving medications, including gabapentin, have increased. We wanted to determine whether people who filled gabapentin and opioid prescriptions concurrently ("gabapentin + opioids") had greater mortality than those who filled an active control medication (tricyclic antidepressants [TCAs] or duloxetine) and opioids concurrently ("TCAs/duloxetine + opioids"). In this population-based, propensity score-matched cohort study, we identified Medicare beneficiaries with spine-related diagnoses from 2017 to 2019. We compared people treated with gabapentin + opioids (n = 67,133) to people treated with TCAs/duloxetine + opioids (n = 67,133) who were matched on demographic and clinical factors. The primary outcome was mortality at any time, and a secondary outcome was occurrence of a major medical complication at any time. Among 134,266 participants (median age 73.4 years; 66.7% female), 2360 died before the end of follow-up. No difference in mortality was observed between groups (adjusted hazard ratio and 95% confidence interval for gabapentin + opioids 0.98 [0.90-1.06]; P = 0.63). However, people treated with gabapentin + opioids were at slightly increased risk of a major medical complication (1.02 [1.00-1.04]; P = 0.03) compared to those treated with TCAs/duloxetine + opioids. Results were similar in analyses (1) restricted to ≤30-day follow-up and (2) that required ≥2 fills of each prescription. When treating pain in older adults taking opioids, the addition of gabapentin did not increase mortality risk relative to addition of TCAs or duloxetine.