Domperidone Drug Profile

What is Domperidone?

Domperidone is a dopamine receptor antagonist medication that belongs to the class of drugs known as prokinetic agents. It is primarily used to treat nausea, vomiting, and digestive disorders by enhancing gastrointestinal motility. The medication works by blocking dopamine receptors in the digestive system and brain areas that control nausea.

Uses

Domperidone is prescribed for several gastrointestinal and related conditions:

• Nausea and vomiting: Treatment of acute and chronic nausea and vomiting from various causes, including medication-induced symptoms
• Gastroparesis: Management of delayed stomach emptying, particularly in diabetic patients, helping food move through the digestive system
• Functional dyspepsia: Relief of upper abdominal discomfort, bloating, and early satiety related to poor stomach motility
• Gastroesophageal reflux: Treatment of reflux symptoms by improving gastric emptying and reducing regurgitation
• Lactation support: Off-label use to increase milk production in breastfeeding mothers, though this use varies by country and regulatory approval

How it works

Domperidone works by blocking dopamine D2 receptors in the gastrointestinal tract and the chemoreceptor trigger zone in the brain. By inhibiting dopamine activity, it removes the natural brake on digestive muscle contractions, allowing the stomach and intestines to move food more effectively. Unlike some other anti-nausea medications, domperidone does not easily cross the blood-brain barrier, which limits central nervous system side effects.

Side effects

Common side effects include:

Submit Your Paper

• Headache
• Dry mouth
• Abdominal cramps
• Diarrhea
• Dizziness
• Fatigue
• Breast tenderness or enlargement
• Irregular menstrual periods

Serious side effects requiring immediate medical attention:

• Irregular heartbeat or palpitations
• Severe allergic reactions with rash, swelling, or difficulty breathing
• Unusual muscle movements or spasms
• Severe abdominal pain
• Signs of hormonal changes such as unexpected milk production

Warnings and precautions

• Cardiac risks: Patients with heart conditions, especially those with prolonged QT interval or electrolyte imbalances, should use domperidone with caution due to potential heart rhythm disturbances
• Liver impairment: Dosage adjustments may be necessary for patients with moderate to severe liver disease, as the drug is metabolized in the liver
• Pregnancy and breastfeeding: Use during pregnancy should be carefully evaluated, and while the drug may increase milk production, its safety during breastfeeding requires medical supervision
• Elderly patients: Older adults may be more sensitive to side effects and require lower doses or more frequent monitoring
• Hormone-sensitive conditions: Patients with prolactin-dependent tumors should avoid domperidone as it can increase prolactin levels

Interactions

• Ketoconazole and other azole antifungals: Can significantly increase domperidone blood levels, potentially leading to dangerous heart rhythm changes
• Erythromycin and clarithromycin: These antibiotics may increase domperidone concentrations and cardiac risks
• HIV protease inhibitors: Drugs like ritonavir can elevate domperidone levels through enzyme inhibition
• Heart rhythm medications: Combining with other QT-prolonging drugs may increase risk of dangerous arrhythmias
• Anticholinergic drugs: May counteract domperidone’s prokinetic effects on the digestive system
• Opioid pain medications: Can oppose domperidone’s gut motility benefits
• Grapefruit juice: May increase domperidone absorption and side effects
• St. John’s wort: This herbal supplement may reduce domperidone effectiveness by increasing its metabolism

Check interactions with the GMJ Interaction Checker

Dosage

Typical adult dosages for domperidone range from 10-20 mg taken three to four times daily, usually before meals and at bedtime. The maximum recommended daily dose is generally 80 mg. For gastroparesis, treatment may continue for several weeks, while acute nausea treatment is typically shorter-term. Dosage should always be individualized based on the specific condition being treated, patient response, and potential risk factors. Healthcare providers may recommend lower starting doses for elderly patients or those with liver impairment.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

This work is licensed under Creative Commons Attribution 4.0 International (CC BY 4.0). You are free to share and adapt this content with attribution to GMJ News (news.gmj.ge).