ZEGERID OTC
Clinical safety rating: caution
Comprehensive clinical and safety monograph for ZEGERID OTC (ZEGERID OTC).
Omeprazole is a proton pump inhibitor (PPI) that suppresses gastric acid secretion by irreversibly binding to the H+/K+-ATPase enzyme (the proton pump) in the gastric parietal cells.
| Metabolism | Primarily metabolized by CYP2C19 and CYP3A4 in the liver. |
| Excretion | Renal (80% as metabolites) and fecal (20%) |
| Half-life | Terminal half-life approximately 1.5-2 hours (0.5-1 hour in children); due to short half-life, acid suppression duration is prolonged via irreversible proton pump inhibition |
| Protein binding | 97% bound to plasma proteins (primarily albumin and alpha1-acid glycoprotein) |
| Volume of Distribution | Approximately 0.15-0.3 L/kg; low Vd indicates limited extravascular distribution |
| Bioavailability | Oral immediate-release: 80-90%; bioavailability is reduced by food; sodium bicarbonate formulation increases bioavailability via gastric pH elevation |
| Onset of Action | Oral: 2.5-3 hours for maximal acid suppression; significant effect within 1 hour |
| Duration of Action | Up to 24 hours after single dose; acid suppression persists for 2-3 days after discontinuation |
| Molecular Weight | 345.42 |
20 mg orally once daily before a meal for 14 days for frequent heartburn; 20 mg orally once daily for up to 8 weeks for erosive esophagitis healing; 20 mg orally once daily for maintenance of healed erosive esophagitis (up to 12 months).
| Dosage form | CAPSULE |
| Renal impairment | No dose adjustment required for mild to moderate renal impairment (CrCl >30 mL/min). For severe renal impairment (CrCl <30 mL/min), maximum daily dose is 20 mg. |
| Liver impairment | For mild to moderate hepatic impairment (Child-Pugh A or B): no dose adjustment. For severe hepatic impairment (Child-Pugh C): maximum daily dose is 20 mg. |
| Pediatric use | For children 2 years and older: weight-based dosing. For erosive esophagitis: 5 mg (5-15 kg), 10 mg (16-30 kg), 20 mg (>30 kg) once daily for up to 8 weeks. For children 1 year and older: 2.5 mg (3-5 kg), 5 mg (6-15 kg), 10 mg (16-30 kg), 20 mg (>30 kg) once daily for up to 8 weeks for GERD. |
| Geriatric use | No specific dose adjustment required, but consider lower starting doses (20 mg daily) due to potential for decreased renal function and increased risk of adverse effects such as Clostridioides difficile infection and osteoporosis-related fractures. |
| 1st trimester | No adequate well-controlled studies in pregnant women during first trimester; based on animal studies and pharmacologic profile, risk cannot be excluded. Use only if clearly needed. |
| 2nd trimester | No evidence of fetal harm in human studies; limited data in second trimester. Generally considered acceptable if indicated. |
| 3rd trimester | No evidence of fetal harm in human studies; limited data in third trimester. Considered relatively safe; may be used if needed. |
Clinical note
Comprehensive clinical and safety monograph for ZEGERID OTC (ZEGERID OTC).
| Placental transfer | Omeprazole crosses the placenta in animals and humans. In human studies, cord blood concentrations are approximately 15-20% of maternal plasma concentrations, indicating moderate placental transfer. |
| Breastfeeding | Omeprazole (active ingredient of ZEGERID OTC) is excreted into human milk in low concentrations. Studies show minimal infant exposure (<0.1% of maternal weight-adjusted dose). No adverse effects observed in breastfed infants. Generally considered compatible with breastfeeding; however, caution is advised in preterm neonates or those with renal impairment. |
■ FDA Black Box Warning
No black box warning.
| Serious Effects |
Hypersensitivity to omeprazole or any component of the formulationConcomitant use with rilpivirineConcomitant use with nelfinavir
| Precautions | Increased risk of Clostridioides difficile infection, Bone fracture risk with long-term use, Hypomagnesemia, Vitamin B12 deficiency, Acute interstitial nephritis, Cutaneous lupus erythematosus, Cyanocobalamin deficiency, Interaction with clopidogrel (reduced efficacy), Interaction with methotrexate (increased toxicity) |
| Food/Dietary | Take on an empty stomach at least 1 hour before a meal. Avoid high-fat meals as they may delay absorption. Food does not significantly alter drug effect if taken appropriately. No specific foods to avoid, but acidic beverages (coffee, citrus) may exacerbate symptoms. |
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| Lactation Rating | L2 (Safer) |
| Teratogenic Risk | FDA Pregnancy Category C. First trimester: Limited human data; animal studies showed no teratogenicity at doses up to 2.5 times the human dose. Second and third trimesters: No known fetal risk; omeprazole crosses the placenta but no increased malformation risk in retrospective studies. |
| Fetal Monitoring | No specific monitoring required beyond standard prenatal care. Monitor maternal symptoms of GERD for efficacy. No fetal monitoring indicated. |
| Fertility Effects | Animal studies at high doses showed reversible impairment of fertility; no human data on fertility effects. Generally considered unlikely to impair fertility at therapeutic doses. |
| Clinical Pearls | Zegerid OTC (omeprazole/sodium bicarbonate) is a proton pump inhibitor combined with antacid buffer for rapid absorption. It should be taken on an empty stomach at least 1 hour before a meal. The sodium content (304 mg per capsule) is significant; caution in hypertension, heart failure, or sodium-restricted diets. Avoid concurrent use with clopidogrel due to reduced antiplatelet effect. Long-term use may increase risk of Clostridium difficile infection, osteoporosis-related fractures, and hypomagnesemia. |
| Patient Advice | Take exactly as directed, usually once daily before the first meal of the day. · Do not crush or chew the capsule; swallow whole with water. · This medication contains sodium bicarbonate; inform your doctor if you are on a low-sodium diet. · Avoid alcohol and NSAIDs (like ibuprofen) as they can worsen stomach irritation. · Notify your doctor if you experience severe diarrhea, bone pain, or muscle cramps. · Do not use for immediate heartburn relief; it may take 1-4 days for full effect. |