Kratom-induced common bile duct dilation.

Kratom is an herb with opioid-like properties that has become readily available in the United States and is being used for self-management of pain and opioid withdrawal. We present a case of common bile duct dilation secondary to use of kratom. Our suspicion is that the mu-opioid agonism associated with kratom use resulted in effects similar to what might be seen in opiate-induced biliary ductal dilation.