The CANBACK trial: a randomised, controlled clinical trial of oral cannabidiol for people presenting to the emergency department with acute low back pain.

Objective: To assess the analgesic efficacy and safety of single-dose oral cannabidiol (CBD) as an adjunct to standard care for patients presenting to an emergency department with acute low back pain.

Design: Randomised, double blinded, placebo-controlled clinical trial.

Setting: The tertiary emergency department of Austin Hospital, Melbourne.