Treatment of Chronic Nausea

First-Line Pharmacologic Therapy

The American Gastroenterological Association recommends metoclopramide as the first-line medication for chronic nausea, dosed at 10-20 mg orally three to four times daily, due to its dual central and peripheral mechanisms of action 1, 2
Metoclopramide works through dopamine receptor antagonism at the chemoreceptor trigger zone and has prokinetic effects that address gastric stasis, with standard dosing of 10-20 mg orally three to four times daily 2, 3
The American College of Gastroenterology suggests that metoclopramide is the only FDA-approved medication specifically for gastroparesis-related symptoms 3
Prochlorperazine is an alternative first-line option, dosed at 5-10 mg four times daily or 10 mg every 6 hours as needed, according to the National Comprehensive Cancer Network 3, 4, 2
Haloperidol is also an alternative first-line option, effective for dopaminergic pathway targeting, dosed at 0.5-1 mg every 6-8 hours 1, 2

The National Comprehensive Cancer Network recommends adding 5-HT3 receptor antagonists, such as ondansetron (4-8 mg twice or three times daily) or granisetron (1 mg twice daily or 34.3 mg transdermal patch weekly), for refractory symptoms 3
Neurokinin-1 receptor antagonists, such as aprepitant (80-125 mg daily), can be added for refractory symptoms, blocking substance P in the nucleus tractus solitarius and area postrema 3, 2

The American College of Gastroenterology suggests combining metoclopramide with corticosteroids (dexamethasone 10 mg twice daily) for enhanced efficacy in patients with persistent nausea despite monotherapy 5, 1, 2
Combining metoclopramide with ondansetron and corticosteroids has proven particularly effective for refractory symptoms 5

Anticholinergic/antihistamine agents, such as meclizine (12.5-25 mg three times daily) or scopolamine (1.5 mg transdermal patch every 3 days), can be used for chronic nausea 3
Atypical antipsychotics, such as olanzapine, can be effective for refractory nausea through multiple receptor antagonism 4
Neuromodulators, such as tricyclic antidepressants (amitriptyline 25-100 mg/day, nortriptyline 25-100 mg/day) or mirtazapine (7.5-30 mg/day), can be used for chronic nausea 3

The National Comprehensive Cancer Network recommends prophylactic antiemetics for patients with prior history of opioid-induced nausea, with metoclopramide around the clock for the first few days when initiating opioids 5, 1
Tolerance to opioid-induced nausea typically develops within a few days to one week 5, 1
Lorazepam is effective for anxiety-related and anticipatory nausea, according to the National Comprehensive Cancer Network 4, 1

Metoclopramide can cause extrapyramidal side effects and tardive dyskinesia with chronic use, particularly in elderly patients, according to the National Comprehensive Cancer Network 5
Domperidone is available only via FDA investigational drug protocol in the US, with doses above 10 mg three times daily not recommended due to QT prolongation risk 3

The National Comprehensive Cancer Network recommends reassessing for constipation, bowel obstruction or impaction, electrolyte abnormalities, CNS pathology or brain metastases, and medication side effects from other drugs before escalating therapy 5, 4
Gastroesophageal reflux should be considered and treated with proton pump inhibitors or H2 blockers if necessary 4

Eating food at room temperature and dietary consultation for persistent symptoms can be helpful, according to the American Gastroenterological Association 1
Acupuncture, hypnosis, or cognitive behavioral therapy can be used for refractory cases, according to the National Comprehensive Cancer Network 4