Multimorbidity, psychoactive substance use and psychological distress among acute medically ill patients: a cross-sectional study.

Background: In order to target the complex health needs of patients with multimorbidity using psychoactive substances, knowledge regarding the association between substance use and multimorbidity in an acute setting is needed.

Aims: Examine psychoactive substance use patterns among acute medically ill patients, and determine the association between multimorbidity and substance use, and psychological distress.

Design: Cross-sectional study.