Prevacid (Lansoprazole) 15 mg OTC and 30 mg Rx: Proton Pump Inhibitor for GERD, Peptic Ulcers & Zollinger-Ellison Syndrome

Information last reviewed: May 2026 — for educational purposes only.

Prevacid (lansoprazole) is a second-generation proton pump inhibitor (PPI) approved for treatment of GERD, erosive esophagitis, duodenal ulcer, gastric ulcer (including H. pylori eradication in combination with antibiotics), NSAID-associated gastric ulcer healing and prevention, and Zollinger-Ellison syndrome. It is available OTC at 15 mg for frequent heartburn and by prescription at 30 mg for the full range of GI indications. Lansoprazole was the first PPI available as an orally disintegrating tablet (Prevacid SoluTab), offering a valuable option for patients who cannot swallow capsules — particularly children and tube-fed patients.

What Is Lansoprazole?

Lansoprazole is a substituted benzimidazole PPI. Like all PPIs, it is a prodrug that requires activation in the acidic environment of the parietal cell secretory canaliculus, where it covalently binds to and irreversibly inhibits the H+/K+-ATPase proton pump. New pump synthesis gradually restores acid secretion over 18–24 hours, explaining once-daily dosing. Lansoprazole has slightly higher oral bioavailability (~80–85%) than omeprazole (~55%) and achieves somewhat faster initial acid suppression, though clinical differences between PPIs are generally modest in most patients.

Lansoprazole is also the original PPI evaluated in triple therapy for H. pylori eradication (lansoprazole + amoxicillin + clarithromycin — the classic "LAC" regimen), which was the dominant H. pylori treatment protocol for many years. While newer quadruple therapies are now often preferred due to clarithromycin resistance patterns, LAC remains guideline-supported in areas with low clarithromycin resistance.

OTC vs. Prescription Status

OTC (Prevacid 24HR): 15 mg delayed-release capsules; for adults and adolescents ≥12 years with frequent heartburn; up to 14 days; may repeat up to 3 courses per year. Not for immediate heartburn relief.
Prescription: 15 mg and 30 mg delayed-release capsules; 15 mg and 30 mg SoluTab (orally disintegrating tablets). Rx doses: 30 mg once daily for duodenal ulcer and GERD treatment; 30 mg twice daily for H. pylori triple therapy (14 days); higher doses for Zollinger-Ellison syndrome.

Strengths and Available Forms

• 15 mg delayed-release capsules — OTC (Prevacid 24HR); also Rx for maintenance GERD
• 30 mg delayed-release capsules — Rx; active ulcer healing, H. pylori eradication, erosive esophagitis treatment
• 15 mg SoluTab (ODT) — prescription orally disintegrating tablet; for patients unable to swallow capsules; dissolves on tongue or in oral syringe with water; contains phenylalanine (caution in PKU patients)
• 30 mg SoluTab (ODT) — Rx; larger dose ODT for active therapy

Capsules should be taken 30–60 minutes before eating. If patients cannot swallow capsules, they may be opened and granules sprinkled on small amount of applesauce or mixed in apple, tomato, or orange juice — the granules should not be chewed. The SoluTab provides a cleaner alternative for tube feeding (mix with water only; do not use acidic juices as this degrades the enteric coating).

Price of Generic Lansoprazole

Generic lansoprazole is available in capsule and ODT forms at very low cost in the US. The 30 mg capsule generic is among the least expensive PPIs per unit dose. Prevacid SoluTab generics are slightly more expensive than capsule generics but still reasonably affordable. The OTC 15 mg is available at competitive pricing in store brands.

Frequently Asked Questions

What makes Prevacid SoluTab different from the capsule?

The Prevacid SoluTab is an orally disintegrating tablet — it dissolves in the mouth without needing water and is swallowed with saliva. This makes it useful for children as young as 1 year old (with the 15 mg SoluTab dissolved in water and administered via oral syringe), and for adults who have difficulty swallowing capsules. Clinically, the SoluTab and capsule have equivalent pharmacokinetics when taken before a meal.

Is lansoprazole safe for long-term use?

Like all PPIs, lansoprazole is generally well tolerated but long-term use (years) carries low-grade risks including mild magnesium depletion, potential vitamin B12 malabsorption, rare interstitial nephritis, and small increases in risk of enteric infections. Patients requiring long-term daily PPI therapy should have this need periodically reassessed. The lowest effective dose and shortest necessary duration are recommended by gastroenterology guidelines.

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