Motilium Instant (Domperidone)

Domperidone is used to manage gastrointestinal motility disorders and related symptoms.

• Nausea and vomiting: reduces episodes by enhancing gastric emptying.
• Gastroparesis: improves stomach emptying and alleviates associated discomfort.
• Functional dyspepsia: lessens upper abdominal pain, early satiety and bloating.
• Post‑operative nausea: helps prevent nausea and vomiting after surgical procedures.
• Chemotherapy‑induced nausea: may be used as adjunct therapy to control nausea.
• Migraine‑related nausea: can be employed to relieve nausea during migraine attacks.

• Domperidone acts peripherally as a selective dopamine D2‑receptor antagonist located primarily in the gastrointestinal tract and the chemoreceptor trigger zone. By blocking dopamine‑mediated inhibition, it enhances the release of acetylcholine, promotes smooth‑muscle contractions, and accelerates gastric emptying, thereby improving overall gastrointestinal motility without crossing the blood‑brain barrier in significant amounts. The drug’s peripheral action limits central nervous system side effects commonly seen with other dopamine antagonists.

Domperidone may cause a range of adverse reactions, most of which are mild and reversible.

Common Side Effects

• Dry mouth: reduced salivation causing throat discomfort.
• Abdominal cramps: intermittent stomach pain.
• Diarrhea: loose, watery stools.
• Headache: mild to moderate head pain.

Serious or Rare Side Effects

• Cardiac arrhythmia: irregular heart rhythm, especially in patients with QT prolongation.
• Extrapyramidal symptoms: involuntary muscle movements or tremor.
• Hyperprolactinemia: elevated prolactin leading to galactorrhea or menstrual changes.
• Severe allergic reaction: rash, swelling, or anaphylaxis.

Before prescribing Motilium Instant, clinicians should evaluate several safety considerations.

• Cardiac risk assessment: evaluate QT interval and history of arrhythmias before use.
• Concomitant QT‑prolonging drugs: avoid combination with other agents that lengthen the QT interval.
• Liver impairment: use with caution in patients with moderate to severe hepatic dysfunction.
• Pregnancy and lactation: prescribe only if potential benefits outweigh uncertain risks.
• Elderly patients: monitor closely for side effects due to altered drug metabolism.
• Store at ambient temperature: keep below 25 °C, retain in original packaging, protect from moisture.

Domperidone can interact with other medicines, affecting its safety or effectiveness.

Major Interactions (Avoid)

• Antifungal agents (ketoconazole, itraconazole): increase plasma concentrations and raise risk of cardiac toxicity.
• Macrolide antibiotics (erythromycin, clarithromycin): potentiate QT prolongation and may cause arrhythmias.
• Certain antidepressants (citalopram, escitalopram): additive effect on cardiac rhythm prolongation.

Moderate Interactions (Monitor Closely)

• Antihistamines (diphenhydramine): may enhance sedation when combined.
• Proton pump inhibitors (omeprazole): can slightly reduce domperidone absorption.
• CYP3A4 inhibitors (verapamil, diltiazem): may raise drug levels; monitor ECG and adjust therapy as needed.