Management of Cannabis Hyperemesis Syndrome (CHS)

Introduction to CHS Management

The definitive treatment for cannabis hyperemesis syndrome is complete cessation of cannabis use, which is the only intervention that leads to long-term resolution of symptoms 1, 2, 3

Topical capsaicin (0.1%) applied to the abdomen can provide symptom relief by activating transient receptor potential vanilloid type 1 receptors 1, 2, 4
Antipsychotics such as haloperidol, promethazine, and olanzapine can be effective for acute symptom management 1, 2
Ondansetron may be tried but often has limited efficacy compared to conventional antiemetic use in other conditions 1, 2
Hot showers or baths (hydrothermotherapy) provide temporary symptomatic relief for patients and can be a diagnostic clue 2
Avoid opioids as they may worsen nausea and carry addiction risk 1, 2

Consider CHS in patients with regular cannabis use (especially >4 times weekly for >1 year) 1, 2
Consider CHS in patients with cyclic vomiting episodes (≥3 episodes annually) 2, 3
Rule out life-threatening conditions first (acute abdomen, bowel obstruction, mesenteric ischemia, pancreatitis, myocardial infarction) 2

Cannabis cessation counseling is essential and the only definitive treatment 1, 2
Tricyclic antidepressants (particularly amitriptyline) are the mainstay of therapy: start at 25 mg at bedtime and titrate weekly to reach minimal effective dose of 75-100 mg 1, 2, 4
Psychological support may be beneficial as anxiety and depression are common comorbidities 3, 4
Co-management with psychiatry for patients with extensive psychiatric comorbidity or treatment resistance 3, 5

CHS should be diagnosed based on clinical features: stereotypical episodic vomiting (≥3 episodes annually) 2, 3
CHS should be diagnosed based on cannabis use patterns: >1 year of use before symptom onset, frequency >4 times weekly 2, 3
CHS should be diagnosed based on cannabis cessation: resolution of symptoms after abstinence for at least 6 months or duration equal to 3 typical vomiting cycles 2, 3