Pantoprazole and domperidone dosing schedule
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domperidone 10mg dosing schedule before meals timing clinical pharmacology
Here is a complete, evidence-based dosing guide for both drugs:
Pantoprazole - Dosing Schedule
Mechanism & Timing Rationale
Pantoprazole is a proton pump inhibitor (PPI) that irreversibly inactivates the H+/K+-ATPase proton pump. It must be taken 30-60 minutes before a meal - this is because:
- In a fasting state, only ~10% of proton pumps are actively secreting acid and susceptible to inhibition
- Peak serum concentration must coincide with maximal proton pump activity (triggered by eating)
- Bioavailability drops ~50% when taken with food
(Katzung's Basic and Clinical Pharmacology, 16th Ed.)
Standard Adult Doses
| Indication | Dose | Frequency | Duration |
|---|---|---|---|
| GERD / Reflux esophagitis | 40 mg | Once daily | 4-8 weeks |
| Severe GERD / Extraesophageal reflux | 40 mg | Twice daily | ≥3 months |
| Peptic ulcer (H. pylori eradication) | 40 mg | Twice daily | 14 days (with antibiotics) |
| NSAID-induced ulcer prevention | 20-40 mg | Once daily | As long as NSAID is used |
| Zollinger-Ellison syndrome | 40-80 mg | Once or twice daily | Long-term |
| IV (stress ulcer / acute bleed) | 80 mg bolus then 8 mg/hr infusion | Continuous | Per clinical need |
| Maintenance (long-term GERD) | 20-40 mg | Once daily | Long-term |
Key Timing Points
- Take 30-60 minutes before breakfast (best option; the morning meal triggers the most proton pump activity)
- If twice-daily dosing is needed, take before breakfast and before dinner
- Full acid-inhibiting effect takes 3-4 days of daily dosing to develop (not all pumps inhibited on day 1)
- After stopping, full acid secretion returns in 3-4 days
- No dose reduction needed in renal impairment or mild-moderate hepatic disease; consider dose reduction in severe liver impairment
(Katzung's Basic and Clinical Pharmacology, 16th Ed.; Sleisenger & Fordtran's GI and Liver Disease)
Domperidone - Dosing Schedule
Mechanism & Timing Rationale
Domperidone is a peripheral dopamine D2-receptor antagonist (prokinetic + antiemetic). It does not cross the blood-brain barrier (unlike metoclopramide), so CNS side effects are minimal. It accelerates gastric emptying and reduces nausea by peripheral and brainstem actions.
It must be taken 15-30 minutes before meals - absorption is slightly delayed when taken after food, and it needs to be present in the system when the stomach begins emptying. (EMA prescribing information; Health Canada product monograph)
Standard Adult Doses
| Indication | Dose | Frequency | Max Daily Dose |
|---|---|---|---|
| Nausea, vomiting, dyspepsia | 10 mg | Up to 3x/day, before meals | 30 mg/day |
| Gastroparesis (standard) | 10 mg | 3-4x/day, before meals (+ bedtime) | 30-40 mg/day |
| Gastroparesis (refractory, specialist-supervised) | 20 mg | 3-4x/day | Up to 80-120 mg/day |
Note: The European Medicines Agency (EMA) recommends capping at 30 mg/day for standard use due to cardiac risk. Higher doses (used in refractory gastroparesis in specialist centres) require baseline ECG to rule out QTc prolongation.
Key Timing Points
- Take 15-30 minutes before meals (and optionally at bedtime if 4x/day dosing is used)
- Symptoms of nausea/dysmotility usually resolve within 3-4 days of treatment
- For short-term use (e.g. acute nausea): do not take for more than 7 days without medical review
- For long-term use (e.g. gastroparesis): requires periodic review and ECG monitoring
- Contraindicated in moderate-severe hepatic impairment (significantly higher AUC)
- Use with caution in renal impairment - reduce dosing frequency to once or twice daily for severe CKD
(Sleisenger & Fordtran's GI and Liver Disease; Yamada's Gastroenterology, 7th Ed.; EMA Annex III; Health Canada Product Monograph)
Combined Use: Pantoprazole + Domperidone
This combination is commonly prescribed for GERD with gastroparesis or functional dyspepsia. When co-prescribed:
| Drug | Time | Meal |
|---|---|---|
| Pantoprazole 40 mg | 30-60 min before meal | - |
| Domperidone 10 mg | 15-30 min before meal | Take just before eating |
Practical schedule (standard once-daily/TID regimen):
- Morning: Pantoprazole 40 mg on waking → 30 min later, Domperidone 10 mg → Breakfast
- Afternoon: Domperidone 10 mg, 15-30 min before lunch
- Evening: Domperidone 10 mg, 15-30 min before dinner (± Pantoprazole 40 mg if BID prescribed)
Important Interactions / Safety Flags
- Domperidone is a QTc-prolonging drug - avoid with other QTc-prolonging agents (azithromycin, fluconazole, haloperidol, TCAs) and with CYP3A4 inhibitors (ketoconazole, clarithromycin, diltiazem, verapamil), which raise domperidone plasma levels
- PPIs (especially omeprazole/esomeprazole) inhibit CYP2C19 and can interact with clopidogrel - pantoprazole has the least CYP2C19 interaction among PPIs and is preferred in patients on antiplatelet therapy
- Domperidone is not FDA-approved in the US; it is available via compounding pharmacies or foreign sources under IND approval; it is approved in most other countries
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