Atidon Tablet (Domperidone 10 mg) – Asiatic Laboratories

1. About Atidon Tablet (Domperidone)

Atidon Tablet contains Domperidone 10 mg, a peripheral dopamine D2 receptor antagonist with prokinetic and antiemetic properties, manufactured by Asiatic Laboratories Ltd., Bangladesh. Domperidone acts primarily in the gastrointestinal tract and chemoreceptor trigger zone (CTZ) without significant CNS penetration, making it safer than older prokinetics (metoclopramide) for long-term use in most patients.

In Bangladesh, Atidon (Domperidone) is particularly important for patients with diabetic gastroparesis — a chronic complication of T2DM where delayed gastric emptying causes nausea, vomiting, bloating, early satiety, and poor glycaemic control. Domperidone is one of the most widely used prokinetics for diabetic gastroparesis globally and is a first-line option in international management guidelines.

2. Mechanism of Action

Domperidone blocks peripheral dopamine D2 and D3 receptors in the stomach and small intestine, enhancing antroduodenal motility and accelerating gastric emptying. In the upper GI tract, dopamine normally inhibits smooth muscle contraction — domperidone's antagonism restores coordinated gastric contractility and reduces gastroesophageal reflux.

Domperidone also blocks D2 receptors in the area postrema (chemoreceptor trigger zone) at the blood-brain barrier, providing antiemetic effect without CNS side effects (unlike metoclopramide which crosses the blood-brain barrier and causes EPS, tardive dyskinesia, and sedation at therapeutic doses).

3. Indications

• Diabetic gastroparesis: Delayed gastric emptying with nausea, vomiting, bloating, early satiety in T2DM — primary prokinetic treatment
• Functional dyspepsia: Upper abdominal discomfort, bloating, post-prandial fullness without structural cause
• Nausea and vomiting: Associated with medication, chemotherapy, or functional causes
• Gastroesophageal reflux (GERD): Adjunct therapy to improve lower oesophageal sphincter tone and accelerate gastric emptying
• Drug-induced nausea: Including nausea from levodopa, bromocriptine, other dopaminergic agents

4. Dosage and Administration

Adults: 10 mg three times daily (30 mg/day), taken 15–30 minutes before meals (and at bedtime if nocturnal symptoms). Maximum 30 mg/day; maximum duration 1 week for most indications per updated EMA guidance (2014) due to QT prolongation risk with long-term high-dose use.

Diabetic gastroparesis (specialist-supervised): Often used at 10 mg TDS for longer periods under cardiological monitoring — QTc assessment essential before extended use.

Elderly: Use lowest effective dose. Increased QT risk in elderly due to cardiac comorbidities.

Children: Domperidone no longer recommended in children <12 years or <35 kg in most countries due to cardiac risk in small children.

5. Contraindications

• Known QT interval prolongation or congenital long QT syndrome
• Severe hepatic impairment (primarily hepatic metabolism)
• Concurrent strong CYP3A4 inhibitors (ketoconazole, clarithromycin, itraconazole, HIV PIs, grapefruit) — markedly increase domperidone levels and QT risk
• Conditions where GI motility stimulation is harmful: GI haemorrhage, mechanical obstruction, perforation
• Prolactin-secreting pituitary tumour (prolactinoma) — domperidone stimulates prolactin
• Hypersensitivity to domperidone

6. Warnings and Precautions

QT Prolongation / Cardiac Risk (Key Safety Concern): Domperidone prolongs the QT interval — risk of ventricular arrhythmias (torsades de pointes). Risk higher with: doses >30 mg/day, elderly patients, cardiac disease, electrolyte disturbances (hypokalaemia, hypomagnesaemia), concurrent QT-prolonging drugs. Baseline ECG before long-term use; avoid with other QT-prolonging medications.

Diabetic patients note: T2DM patients often have cardiac autonomic neuropathy which alters QT dynamics. ECG baseline before domperidone is particularly important in diabetic gastroparesis patients.

Hyperprolactinaemia: Domperidone elevates prolactin (peripheral D2 blockade in pituitary) — may cause galactorrhoea, amenorrhoea, gynaecomastia with prolonged use.

7. Side Effects

Common: Dry mouth, headache, GI discomfort, elevated prolactin (galactorrhoea, menstrual irregularities).

Uncommon: QT prolongation, anxiety, reduced libido.

Rare: Torsades de pointes, sudden cardiac death (at high doses/elderly/interactions), gynecomastia, EPSE (rare vs metoclopramide).

8. Drug Interactions

• Strong CYP3A4 inhibitors (ketoconazole, clarithromycin, itraconazole, ritonavir, grapefruit juice): Contraindicated — dramatically increase domperidone plasma levels and QT risk
• Other QT-prolonging drugs (macrolide antibiotics, fluoroquinolones, antipsychotics, tricyclic antidepressants, amiodarone): Additive QT risk — avoid combination
• Antacids/PPIs: Reduced domperidone absorption if given simultaneously — take domperidone before meals, antacids after
• Opioids: Antagonistic effect on GI motility — domperidone less effective

9. Domperidone in Diabetic Gastroparesis

Diabetic gastroparesis affects approximately 5–12% of T2DM patients in Bangladesh (higher in poorly controlled T2DM). Symptoms — nausea, vomiting, early satiety, bloating, abdominal pain — significantly impair quality of life and glycaemic control (unpredictable gastric emptying → erratic postprandial glucose). Domperidone (Atidon) accelerates gastric emptying, reduces nausea, and improves meal tolerance. It is preferred over metoclopramide for long-term use due to lower CNS side effect risk. Optimised diabetic gastroparesis management includes: glycaemic control (primary), prokinetic therapy (domperidone/metoclopramide), dietary modification (small frequent meals, low fibre/fat), and nutritional support in severe cases.

10. Storage

• Below 30°C, cool and dry, protected from light. Original blister. Out of reach of children.

Frequently Asked Questions (FAQ)

Q1: What is Atidon Tablet (Domperidone) used for in diabetes?

Atidon (Domperidone 10 mg) is used for diabetic gastroparesis — a common T2DM complication causing delayed gastric emptying with nausea, vomiting, bloating, and early satiety. Chronic hyperglycaemia damages the vagus nerve and enteric nervous system, slowing stomach emptying and causing unpredictable postprandial glucose levels. Domperidone accelerates gastric emptying, reduces nausea, and improves meal tolerance, helping stabilise postprandial blood glucose patterns. Beyond gastroparesis, it is used for functional dyspepsia, GERD, and nausea/vomiting.

Q2: Is Atidon Tablet (Domperidone) safer than Maxolon (Metoclopramide)?

For neurological side effects — yes. Domperidone does not cross the blood-brain barrier at therapeutic doses (unlike metoclopramide), so it has a much lower risk of extrapyramidal side effects (acute dystonia, parkinsonism, tardive dyskinesia) and sedation. This is why domperidone is preferred over metoclopramide for longer-term use in diabetic gastroparesis. However, domperidone has its own significant risk: QT interval prolongation and potential cardiac arrhythmias — a risk that metoclopramide has less prominently. Both should be used at the lowest effective dose for the shortest necessary duration.

Q3: How should Atidon Tablet be taken for best effect?

Take Atidon 10 mg 15–30 minutes before meals (and before bedtime if nocturnal symptoms are present). Taking domperidone before eating means peak plasma levels coincide with the postprandial period when gastric motility is most important. Do not take domperidone after meals — reduced absorption and delayed action. The standard adult dose is 10 mg three times daily (before breakfast, before lunch, before dinner). Maximum 30 mg/day. Treatment duration: EMA recommends maximum 1 week for routine use; specialist supervision required for longer durations in gastroparesis.

Q4: Can Atidon be taken with antibiotics or heart medications?

Caution required. Domperidone has significant drug interactions that must be checked: (1) Azithromycin and clarithromycin: Both prolong QT — clarithromycin also inhibits CYP3A4 (increasing domperidone levels). Avoid combination. (2) Metronidazole: May have additive QT effect — caution. (3) Cardiac medications (amiodarone, digoxin, some antihypertensives): Check for QT-prolonging potential — avoid combinations where both agents prolong QT. (4) Antifungals (fluconazole, itraconazole, ketoconazole): Increase domperidone dramatically — contraindicated. Always inform prescriber of all concurrent medications before starting domperidone.