Marijuana and Ileus: Clinical Relationship and Management

Pathophysiological Mechanism

Marijuana's main active ingredient (Δ9-THC) activates CB1 receptors located throughout the gut, primarily in myenteric and submucosal neurons, which can inhibit gastrointestinal motility 2, 3
Stimulation of CB1 receptors can lead to loss of negative feedback on the hypothalamic-pituitary-adrenal axis, resulting in increased vagal nerve discharges that affect gut motility 3
Cannabis has been shown to inhibit gastric motility and emptying through activation of peripheral CB1 receptors 1

CHS is characterized by cyclic vomiting, nausea, and abdominal pain in chronic cannabis users 1, 4
Clinical diagnostic criteria for CHS include stereotypical episodic vomiting, cannabis use for more than 1 year before symptom onset, and cannabis use more than 4 times per week on average 1, 4
The prevalence of CHS is rising with increased cannabis legalization and higher THC concentrations in modern cannabis products 5, 4
CHS can lead to complications including dehydration, electrolyte abnormalities, and potentially contribute to ileus through effects on gut motility 1, 4

For patients with suspected cannabis-related ileus, cannabis cessation is the definitive treatment for cannabis-related gut motility disorders 1, 4
Correct dehydration and electrolyte abnormalities, particularly potassium and magnesium, which are crucial for intestinal motility 6
Consider nasogastric tube placement for decompression in patients with severe abdominal distention 6
Avoid medications that can worsen ileus, including opioids and anticholinergics 6, 4
For patients with cannabinoid hyperemesis syndrome, topical capsaicin (0.1%) may improve symptoms through activation of transient receptor potential vanilloid type 1 receptors 1, 4
Consider benzodiazepines, haloperidol, promethazine, olanzapine, or ondansetron for acute symptom control 1, 4
For long-term management, tricyclic antidepressants such as amitriptyline may be effective 1

Cannabis-related gut motility disorders are often underdiagnosed or misdiagnosed due to limited awareness among clinicians 4
Patients may paradoxically report that cannabis helps relieve their gastrointestinal symptoms, leading to continued use and worsening of the underlying condition 2, 4
Cannabis withdrawal syndrome can begin after 48 hours of abstinence and may include nausea and stomach pain, potentially complicating the clinical picture 4
When evaluating patients with ileus, consider cannabis use in the differential diagnosis, especially in young adults with recurrent symptoms 1, 4
Be aware that the prevalence of cannabis-related gut motility disorders is increasing with the rise in cannabis legalization and higher THC concentrations in modern cannabis products 5, 4