1. Clinical Overview
A fixed-dose combination (FDC) of a prokinetic agent (Levosulpiride) and a proton pump inhibitor (Rabeprazole) used primarily for the management of gastroesophageal reflux disease (GERD) and functional dyspepsia. Levosulpiride enhances gastric motility and has anti-emetic properties, while Rabeprazole suppresses gastric acid secretion by inhibiting the H+/K+ ATPase pump in gastric parietal cells. This combination addresses both dysmotility and hyperacidity, common in upper GI disorders prevalent in the Indian population.
| Onset | Duration | Bioavailability |
|---|---|---|
| Rabeprazole: Acid suppression begins within 1 hour; Levosulpiride: Prokinetic effects start within 30-60 minutes. | Rabeprazole: Up to 24 hours (due to irreversible proton pump inhibition). Levosulpiride: Approximately 6-8 hours. | Rabeprazole: ~52% (oral). Levosulpiride: ~30% (oral). |
2. Mechanism of Action
The combination works synergistically. Rabeprazole is a proton pump inhibitor that covalently binds to and irreversibly inhibits the H+/K+ ATPase enzyme system (the proton pump) on the secretory surface of gastric parietal cells, leading to profound and long-lasting inhibition of gastric acid secretion (both basal and stimulated). Levosulpiride is a selective antagonist at presynaptic dopamine D2 receptors in the gastrointestinal tract. This blockade leads to increased acetylcholine release, enhancing gastric motility (prokinetic effect), accelerating gastric emptying, and strengthening lower esophageal sphincter tone. It also has central anti-dopaminergic (anti-emetic) and mild anxiolytic effects.
3. Indications & Uses
- Gastroesophageal Reflux Disease (GERD)
- Functional Dyspepsia (Non-ulcer dyspepsia)
- Duodenal Ulcer
- Gastric Ulcer
4. Dosage & Administration
Adult Dosage: One tablet (Levosulpiride 75mg + Rabeprazole 20mg) once or twice daily, 30-60 minutes before food. For GERD/Erosive Esophagitis: Usually once daily. For severe dyspepsia/motility issues: May be prescribed twice daily.
Administration: Swallow the tablet whole with a glass of water. Do not crush, split, or chew. Should be taken on an empty stomach, at least 30-60 minutes before a meal (preferably breakfast and/or dinner) for optimal absorption and effect. If a dose is missed, take it as soon as remembered unless it's almost time for the next dose.
5. Side Effects
Common side effects may include:
- Headache
- Diarrhea
- Nausea
- Abdominal pain
- Flatulence
- Constipation
- Dry mouth
- Dizziness
- Increased serum prolactin (leading to galactorrhea, gynecomastia, menstrual irregularities)
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Ketoconazole, Itraconazole, Posaconazole | Rabeprazole reduces gastric acidity, decreasing absorption of these azole antifungals (which require acid for absorption). | Major |
| Digoxin | Increased gastric pH may increase bioavailability of digoxin. | Moderate |
| Warfarin | Rabeprazole may inhibit CYP2C19, potentially increasing INR. Monitor INR closely. | Moderate |
| Methotrexate | PPIs may increase methotrexate levels by reducing renal clearance, increasing toxicity risk. | Major |
| Clopidogrel | Rabeprazole (a CYP2C19 inhibitor) may reduce the antiplatelet effect of clopidogrel (a prodrug activated by CYP2C19). Consider alternative PPI like pantoprazole. | Major |
| Atazanavir, Rilpivirine (HIV drugs) | Rabeprazole reduces acidity, severely decreasing absorption of these drugs. Contraindicated. | Major |
| Other CNS depressants (Alcohol, Benzodiazepines) | Levosulpiride may potentiate sedative effects. | Moderate |
| Levodopa, Dopamine agonists | Levosulpiride (dopamine antagonist) may antagonize the effects of these Parkinson's drugs. | Major |
| Drugs prolonging QT interval (e.g., Erythromycin, Fluoroquinolones, TCAs, Antipsychotics) | Additive risk of QT prolongation and cardiac arrhythmias with levosulpiride. | Major |
7. Patient Counselling
- DO take the tablet 30-60 minutes before a meal, usually breakfast.
- DO swallow the tablet whole with water; do not crush or chew.
- DO inform your doctor if you are pregnant, planning pregnancy, or breastfeeding.
- DO report any involuntary muscle movements, restlessness, or tremors immediately.
- DO inform all your doctors and dentists you are taking this medicine, especially before surgery.
- DONT take with other over-the-counter antacids without consulting your doctor.
- DONT stop taking the medicine abruptly if used for a long time; taper as advised.
- DONT consume alcohol while on this medication.
8. Toxicology & Storage
Overdose: Levosulpiride overdose: Severe extrapyramidal reactions (dystonia, oculogyric crisis), sedation, coma, hypotension, QT prolongation leading to torsades de pointes. Rabeprazole overdose: Confusion, drowsiness, blurred vision, tachycardia, nausea, diaphoresis, flushing, headache, dry mouth.
Storage: Store below 30°C, in a cool, dry place, protected from light and moisture. Keep out of reach of children. Do not use after the expiry date printed on the pack.