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Domperidone

Domperidone: Generic Medication Overview

Domperidone is a prescription-only medication that belongs to the Digestive Health therapeutic class. It is available in the United Kingdom as a 10 mg pill and is marketed under several brand names, for example Motilium. The active ingredient is Domperidone, a peripheral dopamine-2 (D₂) receptor antagonist that promotes gastrointestinal motility and reduces nausea.

In the UK, the Medicines and Healthcare products Regulatory Agency (MHRA) regulates its availability, and it is commonly prescribed by physicians and pharmacists for specific digestive-related conditions.

How Domperidone Works in the Body

Domperidone blocks dopamine D₂ receptors located outside the central nervous system, primarily in the chemoreceptor trigger zone and the smooth muscle of the gastrointestinal (GI) tract. By antagonising dopamine, it:

• Enhances GI motility - increases the rate of gastric emptying and intestinal transit, helping food move more efficiently through the stomach and intestines.
• Raises the threshold for nausea and vomiting - reduces the stimulus that activates the vomiting centre in the brain.

Because Domperidone does not readily cross the blood-brain barrier, it has limited central nervous system effects, making it different from other dopamine antagonists such as metoclopramide. Onset of action typically occurs within 30 minutes, with peak plasma concentrations reached in about 1-2 hours. The drug’s elimination half-life is roughly 7-9 hours, and it is mainly metabolised by the liver (CYP3A4) and excreted in the urine.

Conditions Treated by Domperidone

In the United Kingdom, Domperidone is licensed for the following indications:

• Nausea and vomiting associated with gastrointestinal disorders, chemotherapy, or postoperative states.
• Dyspepsia (indigestion) that is thought to be related to delayed gastric emptying.
• Gastroparesis secondary to diabetes or other causes, when other pro-kinetic agents are unsuitable.

These uses are supported by clinical guidelines from the National Institute for Health and Care Excellence (NICE) and the British National Formulary (BNF).

Patient Suitability and Contraindications

Who should consider using Domperidone?

• Adults experiencing nausea, vomiting, or functional dyspepsia where delayed gastric emptying is suspected.
• Patients with mild-to-moderate hepatic impairment (dose adjustments may be required).

Absolute contraindications

• Known hypersensitivity to Domperidone or any of its excipients.
• Prolactin-dependent tumors (e.g., pituitary adenomas).
• History of significant cardiac arrhythmias, especially prolonged QT interval.
• Concurrent use of strong CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, erythromycin) that could raise Domperidone plasma levels.

Relative contraindications and cautions

• Severe liver disease (Child-Pugh C).
• Elderly patients (≥ 65 years) - higher risk of cardiac adverse effects.
• Pregnancy (category B3 in the UK) - use only if the potential benefit outweighs the risk.
• Breast-feeding - Domperidone is excreted in breast milk; caution advised.

If any of these conditions apply, a healthcare professional must assess the risk-benefit balance before prescribing.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Dry mouth
• Abdominal cramps or mild constipation
• Headache
• Dizziness or light-headedness
• Increased prolactin levels leading to galactorrhoea or breast tenderness

These reactions are generally mild, transient, and do not require medical intervention unless they persist.

Serious Adverse Events

• Cardiac arrhythmias and QT-interval prolongation, which can lead to torsades de pointes.
• Extrapyramidal symptoms (rare, due to limited central penetration).
• Severe allergic reactions (e.g., rash, angioedema).

The MHRA has issued safety warnings highlighting the need for caution in patients with known cardiac disease or those receiving other QT-prolonging drugs. Immediate medical attention is warranted if patients experience palpitations, syncope, or unexplained fainting.

Drug Interactions

• CYP3A4 inhibitors (ketoconazole, erythromycin, clarithromycin, itraconazole, ritonavir) - may increase Domperidone concentrations and cardiac risk.
• Other QT-prolonging agents (e.g., amiodarone, quinidine, certain antipsychotics) - additive effect on cardiac repolarisation.
• Antifungal agents (azole class) and macrolide antibiotics - similar metabolic pathway concerns.
• Cimetidine - may reduce gastric acidity and affect absorption, though clinical significance is limited.

Patients should disclose all prescription medicines, over-the-counter drugs, herbal supplements, and vitamins to their prescriber.

Food and Lifestyle Interactions

• Domperidone can be taken 15-30 minutes before meals and at bedtime; food does not markedly impair absorption.
• High-fat meals may modestly delay onset but do not diminish overall efficacy.
• Alcohol does not interact directly, but excessive consumption can exacerbate nausea or dizziness.
• Driving or operating machinery: patients experiencing dizziness should exercise caution.

How to Take Domperidone

Standard adult dosing (based on the 10 mg tablet)

• Nausea or vomiting: 10 mg taken up to four times daily, preferably 15-30 minutes before meals and at bedtime.
• Dyspepsia/Gastroparesis: 10 mg three times daily before meals; some clinicians may prescribe 20 mg three times daily, but the 10 mg formulation is the only strength available in the UK.

Maximum daily dose: Do not exceed 40 mg per day unless explicitly directed by a specialist.

Special populations

• Renal or hepatic impairment: Dose reductions are often required; clinicians may start with 10 mg once daily and titrate based on response and safety monitoring.
• Elderly patients: Use the lowest effective dose and limit duration to reduce cardiac risk.

Administration tips

• Swallow the tablet whole; do not crush or chew.
• Store at room temperature, away from moisture and direct sunlight.
• Keep out of reach of children.

Missed dose

• If a dose is missed, take it as soon as remembered provided there is still at least 4 hours before the next scheduled dose.
• Do not double the dose to “make up” for a missed tablet.

Overdose

• Symptoms may include severe drowsiness, rapid heart rate, or cardiac arrhythmias.
• Seek urgent medical attention; treatment is primarily supportive, and activated charcoal may be considered if presentation is early.

Discontinuation

• Domperidone does not typically require tapering, but abrupt cessation may lead to a rebound of nausea in some patients.
• Discuss any plan to stop the medication with a healthcare professional.

Monitoring and Follow-Up

• Cardiac monitoring: For patients at risk (elderly, cardiac history, or on interacting meds), an electrocardiogram (ECG) to assess QT interval is recommended before initiating therapy and periodically during treatment.
• Liver function tests (LFTs): Baseline LFTs are advisable in patients with known hepatic disease and should be repeated if clinical concerns arise.
• Prolactin levels: May be measured if patients develop galactorrhoea or menstrual disturbances.

Regular review with a prescriber is essential to evaluate therapeutic benefit and detect any adverse effects early.

Storage and Handling

• Keep the 10 mg pills in the original container, tightly closed, and stored below 25 °C (77 °F).
• Protect from excess moisture and light.
• Do not use tablets beyond the expiry date printed on the package.
• For safe disposal, return unused medication to a pharmacy or follow local NHS guidelines for clinical waste.

Medication-Specific Glossary

Prokinetic

A class of drugs that enhance gastrointestinal motility; Domperidone is a peripheral prokinetic agent.

QT Prolongation

Lengthening of the heart’s electrical repolarisation period on an ECG, increasing the risk of torsades de pointes.

CYP3A4

An enzyme in the liver responsible for metabolising many drugs, including Domperidone.

Galactorrhoea

Involuntary milk production, often linked to elevated prolactin levels caused by dopamine antagonism.

Medical Disclaimer

This article provides educational information about Domperidone and is not a substitute for professional medical advice. Treatment decisions, including the use of Domperidone for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.