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Symptoms of overdosage may include drowsiness, disorientation, and extrapyramidal reactions. Anticholinergic or anti-Parkinson drugs or antihistamines with anti-cholinergic properties may be helpful in controlling the extrapyramidal reactions. Symptoms are self-limiting and may disappear within 24 hours.
Hemodialysis removes relatively little metoclopramide, probably because of the small amount of the drug in blood relative to tissues. Similarly, continuous ambulatory peritoneal dialysis does not remove significant amounts of drug. It is unlikely that dosage would need to be adjusted to compensate for losses through dialysis. Dialysis is not likely to be an effective method of drug removal in overdose situations.
Unintentional overdose has been reported in infants and children with the use of metoclopramide oral solution. While there was no consistent pattern to the reports associated with these overdoses, events included seizures, extrapyramidal reactions, and lethargy.
Methemoglobinemia has occurred in premature and full-term neonates who were given overdoses of metoclopramide (1 to 4 mg/kg/day orally, intramuscularly or intravenously for 1 to 3 or more days). Methemoglobinemia can be reversed by the intravenous administration of methylene blue. However, methylene blue may cause hemolytic anemia in patients with G6PD deficiency, which may be fatal.
Intestinal Obstruction, Hemorrhage, or Perforation
Metoclopramide is contraindicated in patients with pheochromocytoma because the drug may precipitate a hypertensive crisis, most likely due to release of catecholamines from the tumor. Such hypertensive crises may be controlled by phentolamine.
Known Sensitivity or Intolerance
Metoclopramide is contraindicated in patients with known sensitivity or intolerance to the drug.
Do not use metoclopramide in patients with epilepsy since the frequency and severity of seizures may be increased.
Concomitant Medications with Extrapyramidal Reactions
Do not use metoclopramide in patients receiving other drugs which are likely to cause extrapyramidal reactions, since the frequency and severity of extrapyramidal reactions may be increased [see WARNINGS AND PRECAUTIONS, ADVERSE REACTIONS and DRUG INTERACTIONS].This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 10/17/2011
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