Metoklopramid Hameln (Metoclopramide Hydrochloride Monohydrate)

Metoclopramide acts on the dopaminergic and serotonergic pathways to control nausea, vomiting and gastric motility.

• Nausea and vomiting: reduces frequency and severity of episodes in postoperative, chemotherapy‑induced or other causes.
• Gastroparesis: accelerates gastric emptying and improves related symptoms.
• Gastroesophageal reflux disease: facilitates gastric emptying to lessen reflux episodes.

• Metoclopramide competitively blocks dopamine D2 receptors in the chemoreceptor trigger zone, diminishing the vomiting reflex. It also antagonizes 5‑HT3 receptors and stimulates 5‑HT4 receptors, which together enhance coordinated gastrointestinal smooth‑muscle contractions, increasing gastric tone and accelerating gastric emptying. These actions also improve lower esophageal sphincter pressure, contributing to reflux control.

Metoclopramide may cause a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Drowsiness: feeling of sleepiness or reduced alertness.
• Restlessness or akathisia: inner sense of unease and inability to stay still.
• Diarrhea: loose, frequent stools.
• Headache: mild to moderate head pain.

Serious or Rare Side Effects

• Extrapyramidal symptoms: muscle rigidity, tremor, or dystonia, especially with rapid administration.
• Tardive dyskinesia: potentially irreversible involuntary movements after prolonged use.
• Neuroleptic malignant syndrome: life‑threatening reaction with fever, muscle rigidity, autonomic instability.
• Anaphylaxis: severe allergic reaction with hives, swelling and breathing difficulty.

Before using Metoclopramide, clinicians should evaluate patient-specific factors and follow safety guidelines.

• Assess renal and hepatic function: dose adjustment may be needed in impairment.
• Monitor for extrapyramidal symptoms: watch for muscle rigidity, tremor, or abnormal movements.
• Use the lowest effective dose: limit duration to reduce risk of tardive dyskinesia.
• Avoid in patients with known hypersensitivity: discontinue if allergic reaction occurs.
• Caution in pregnancy and lactation: benefits must outweigh potential risks.
• Store at room temperature: keep in original packaging, protect from moisture and light.

Metoclopramide can affect the activity of several other medicines; some combinations require avoidance while others need close monitoring.

Major Interactions (Avoid)

• Antipsychotics (e.g., haloperidol): additive dopamine blockade may increase extrapyramidal risk.
• Monoamine oxidase inhibitors (MAOIs): combined effect can precipitate severe hypertension or serotonin syndrome.
• Strong CYP2D6 inhibitors (e.g., fluoxetine, paroxetine): may raise metoclopramide plasma levels and toxicity.

Moderate Interactions (Monitor Closely)

• Opioids (e.g., morphine): enhanced risk of constipation and reduced gastrointestinal motility.
• Serotonergic agents (e.g., ondansetron): potential for serotonin syndrome, monitor symptoms.