Hyperacidity, GERD, and ulcers:

Indications for: Omeprazole

Triple therapy (w. amoxicillin + clarithromycin) or dual therapy (w. clarithromycin) for H. pylori eradication in duodenal ulcer disease. Short-term treatment of active benign gastric ulcer, active duodenal ulcer, erosive esophagitis (EE), symptomatic GERD. Maintenance of healing of EE. Pathological hypersecretory conditions.

Adult Dosage:

Take before eating. Caps: swallow whole, or may mix contents of caps in applesauce and take immediately; do not crush or chew granules; follow with water. Susp: Mix 2.5mg packet with 5mL of water; mix 10mg packet with 15mL of water. Leave 2–3 mins to thicken, stir and drink within 30 mins. NG or gastric tube: see full labeling. Triple therapy: omeprazole 20mg + clarithromycin 500mg + amoxicillin 1g, all every 12hrs for 10 days; then (if ulcer was present at start): omeprazole 20mg once daily in the AM on Days 11–28. Dual therapy (clarithromycin resistance more likely to develop than with triple therapy): omeprazole 40mg once daily in the AM + clarithromycin 500mg three times daily on Days 1–14; then (if ulcer was present at start) omeprazole 20mg once daily in the AM on Days 15–28. Active duodenal ulcer: 20mg once daily for 4 weeks; may continue 4 more weeks. Gastric ulcer: 40mg once daily for 4–8 weeks. GERD (no esophageal lesions): 20mg once daily for up to 4 weeks. EE with GERD symptoms: 20mg once daily for 4–8 weeks; may give up to 4 more weeks (if relapse of erosive esophagitis or GERD symptoms occurs may give additional 4–8 week course). Maintenance of healing of EE: 20mg once daily. Hypersecretory conditions: initially 60mg once daily, then adjust; doses up to 120mg 3 times daily have been used; give doses >80mg/day in divided doses. Hepatic impairment or Asian: consider reducing dose (esp. for maintenance of healing of EE).

Children Dosage:

Take before eating. Caps: swallow whole, or may mix contents of caps in applesauce and take immediately; do not crush or chew granules; follow with water. Susp: Mix 2.5mg packet with 5mL of water; mix 10mg packet with 15mL of water. Leave 2–3 mins to thicken, stir and drink within 30 mins. NG or gastric tube: see full labeling. <1yr: not established. 1–16yrs: GERD, EE: 5–<10kg: 5mg daily. 10–<20kg: 10mg daily; ≥20kg: 20mg daily.

Omeprazole Warnings/Precautions:

Gastric malignancy. Discontinue and evaluate if acute tubulointerstitial nephritis, severe cutaneous adverse reactions, or cutaneous/systemic lupus erythematosus occurs. Long-term therapy (eg, >3yrs) may lead to malabsorption/deficiency of Vit. B12 or atrophic gastritis. Monitor magnesium levels during prolonged therapy. Consider monitoring magnesium, calcium levels in those with preexisting risk of hypocalcemia (eg, hypoparathyroidism). Increased risk of fundic gland polyps with long-term use (esp. >1yr) or osteoporosis-related fractures (hip, wrist or spine) with long-term (>1yr) and multiple daily dose PPI therapy. Use lowest dose for shortest duration appropriate to condition. Pregnancy. Nursing mothers.

Omeprazole Classification:

Proton pump inhibitor.

Omeprazole Interactions:

Concomitant St. John's wort, rifampin, atazanavir, nelfinavir: not recommended. Potentiates saquinavir, cilostazol; consider dose reduction of these drugs. May potentiate diazepam, phenytoin, warfarin, tacrolimus, methotrexate. Caution with drugs that may cause hypomagnesemia (eg, digoxin, diuretics); monitor. Potentiated by voriconazole; may need to adjust omeprazole dose in Zollinger-Ellison syndrome. Antagonizes clopidogrel; consider alternative anti-platelet therapy. May alter absorption of pH-dependent drugs (eg, ketoconazole, erlotinib, mycophenolate mofetil, digoxin, iron salts, ampicillin). Monitor drugs metabolized by CYP450 (eg, cyclosporine, disulfiram, benzodiazepines). May give antacids concomitantly. May interfere with neuroendocrine diagnostic tests; discontinue omeprazole 14 days prior to CgA level assessment.

Adverse Reactions:

Headache, abdominal pain, nausea, vomiting, diarrhea, flatulence; bone fracture, possible C. difficile-associated diarrhea; rare: hypomagnesemia and mineral metabolism. Children: also, respiratory system events, fever.

Note:

Note: See Amoxil entry for more information on amoxicillin. See Biaxin entry for more information on clarithromycin.

Generic Drug Availability:

Caps (YES); susp (NO)

How Supplied:

Caps—contact supplier; Packets—30

Pricing for Omeprazole

40mg capsule (Qty: 30)
Appx. price $11
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