Introduction: In recent years, medical marijuana (MM) is increasingly being used for the treatment of chronic pain. Depression and anxiety have been identified as risk factors for the problematic use of prescription opioids, yet their contribution to developing MM dependence hasn't been explored up to date. In this study we explored the association between depression and anxiety severity and the risk for cannabis dependence among chronic pain patients prescribed MM.
Methods: Participants were 324 chronic pain patients prescribed MM with no cuncurrent opioid treatment. All participants were screened for depression using the Patient Health Questionnaire (PHQ-9), for anxiety using the Generalized Anxiety Disorder questionnaire (GAD-7) and for problematic use of MM according to DSM-IV criteria for cannabis dependence using the AUDADI-IT questionnaire. Logistic regression analyses controlling for additional sociodemographic and clinical factors were conducted.
Results: Generally, prevalence of cannabis dependence was higher among participants with levels of depression and anxiety levels compared to those without depression or anxiety. However, after controlling for confounders only participants with severe depression were significantly more likely (Adjusted Odds Ratio=5.86) to screen positive for cannabis dependence compared to those without depression.
Conclusions: Severe depression may be a risk factor for problematic use of MM among chronic pain patients. Increasing use of MM calls for further explotartion of potential risk factors which may predict problematic MM use among this population.