The contribution of nonmedical opioid use to healthcare encounters for opioid overdose and use disorders among long-term users with metastatic cancer

Opioid misuse is increasingly recognized as a relevant problem among patients with cancer. However, the applicability of these concerns for patients with metastatic disease is complicated by shorter prognoses and greater symptom burden. This study aimed to investigate whether nonmedical opioid use (NMOU) was identified as contributing to opioid-related healthcare encounters among patients with metastatic cancer receiving long-term prescribing.

The study included patients with stage IV cancer diagnosed from 2004–2017 in Alberta, Canada who 1) received long-term opioid prescribing and 2) experienced ≥ 1 hospitalization or emergency department visit relating to opioid overdose or use disorder. Records from visits to cancer centres and opioid-related hospital encounters were reviewed to identify any documentation of NMOU. Patient characteristics were compared between those with and without documented NMOU.

Charts of 46 patients were reviewed. Although NMOU contributed to opioid-related encounters, these events were often related to poorly controlled pain, declining functional status, and disease progression. NMOU behaviors were documented for 16 (35%) patients. The most common NMOU behaviour was overuse of prescribed medications, which was documented for 12 patients. For 7 patients, there were indications of use of opioids for psychological coping, including 3 encounters caused by intentional overdoses with suicidal intent. Patients with NMOU were significantly more likely to have a history of substance use and limited social support.

Approximately 1-in-3 patients experiencing opioid-related hospitalizations/emergency department visits had indications of NMOU. Further psychosocial care and interdisciplinary pain management are warranted to improve safe prescribing for these patients.