A dopamine D2 receptor antagonist and prokinetic agent used for the treatment of GERD, diabetic gastroparesis, and prevention of nausea and vomiting associated with chemotherapy and surgery. Metoclopramide enhances upper GI motility and has central antiemetic activity, but carries a risk of tardive dyskinesia with prolonged use.
Evidence rating strong. Most-documented uses: acceleration of gastric emptying in gastroparesis, relief of gerd symptoms, prevention of chemotherapy-induced nausea. 10 sources indexed (2016–2024), with 1 interaction record on file.
The science
How it works, mechanistically.
Core mechanism
Blocks dopamine D2 receptors centrally in the chemoreceptor trigger zone (antiemetic effect) and peripherally in the GI tract (prokinetic effect). It also enhances the response to acetylcholine in the upper GI tract, increasing gastric contractions, raising lower esophageal sphincter tone, and accelerating gastric emptying. At higher doses, it also antagonizes 5-HT3 receptors.
Class
Prokinetic Antiemetic
Absorption
Best on an empty stomach
Dosing
Dosing & protocol.
Common range
5–10 mg three to four times daily, 30 minutes before meals; maximum 12 weeks of use recommended (as prescribed by your physician)
Recommended form
Tablet, oral solution, or IV/IM injection
Take 30 minutes before meals and at bedtime for gastroparesis
Metoclopramide has rare reports of serotonin syndrome, especially when combined with serotonergic drugs. St. John's Wort has serotonergic activity and published clinical interaction reviews describe serotonin syndrome when it is combined with serotonergic medicines. The combination is not well studied directly, but the shared serotonergic risk makes it a clinically meaningful caution.
Recommendation: Avoid combining St. John's Wort with metoclopramide unless your prescriber specifically approves it. Stop St. John's Wort and seek urgent care for agitation, confusion, sweating, fever, diarrhea, tremor, muscle rigidity, or jerking movements after metoclopramide use. Also tell your clinician about any antidepressants, tramadol, or migraine medicines.
Si S, Zhao G, Song G et al.. Efficacy and safety of domperidone and metoclopramide on human milk production in postpartum mothers: a bayesian network meta-analysis of randomized controlled trials. BMC pregnancy and childbirth. 2024
Song Q, Yang H, Yang X. Intravenous ketorolac versus metoclopramide in adult patients with migraine headaches: An updated systematic review and meta-analysis. Advances in clinical and experimental medicine : official organ Wroclaw Medical University. 2024
Ai M, Cai Y, Zeng Y et al.. Efficacy of acupoint injection of metoclopramide for post-chemotherapy vomiting: A systematic review and meta-analysis. Medicine. 2024
Abdelmonem H, Abdelhay HM, Abdelwadoud GT et al.. The efficacy and safety of metoclopramide in relieving acute migraine attacks compared with other anti-migraine drugs: a systematic review and network meta-analysis of randomized controlled trials. BMC neurology. 2023
Junqueira DR, Bennett D, Huh SY et al.. Risk of Adverse Events Associated with Domperidone and Metoclopramide in Gastroparesis: Systematic Review and Meta-analysis. Drugs in R&D. 2023
Shen Q, Khan KS, Du MC et al.. Efficacy and Safety of Domperidone and Metoclopramide in Breastfeeding: A Systematic Review and Meta-Analysis. Breastfeeding medicine : the official journal of the Academy of Breastfeeding Medicine. 2021
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