Prevacid vs. Pepcid

See how Prevacid and Pepcid compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Prevacid is a proton pump inhibitor that blocks acid production more completely than Pepcid, an H2 blocker, making it the stronger choice for healing erosive esophagitis and ulcers.

  • Pepcid starts easing symptoms within about an hour, while Prevacid can take one to four days to reach its full acid-suppressing effect.

  • Both drugs treat pathological hypersecretory conditions, but only Prevacid is FDA-approved for H. pylori eradication and lowering NSAID-related ulcer risk.

Prevacid vs. Pepcid Drug Summary

Prevacid

Prevacid (lansoprazole) is a proton pump inhibitor that reduces stomach acid production to treat ulcers, GERD, erosive esophagitis, and H. pylori infection. It comes as a delayed-release capsule, an orally disintegrating tablet, or an IV injection, and is usually taken once daily before a meal.

Pepcid

Pepcid (famotidine) is an H2 blocker that lowers stomach acid to treat ulcers, GERD, and erosive esophagitis, and to manage conditions that cause excess acid production. It comes as an oral tablet taken once or twice daily and starts working within about an hour, faster than a PPI.

Prevacid vs. Pepcid Side Effects

Prevacid

Most common
headache (up to 7%)
diarrhea (up to 3.8%)
dizziness (up to 3%)
abdominal pain (up to 5%)

Pepcid

Most common
headache (up to 4.7%)
diarrhea (up to 1.7%)
dizziness (up to 1.3%)
constipation (up to 1.2%)

Prevacid vs. Pepcid Dosage

Prevacid

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 15 mg once daily At the start
Maximum dose 60 mg once daily If needed
Dose changes 3 increases As tolerated

Pepcid

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily At the start
Maximum dose 20-40 mg twice daily If needed
Dose changes 3 increases As tolerated

Prevacid vs. Pepcid Indications

Prevacid

Prevacid treats duodenal and gastric ulcers, erosive esophagitis, and GERD, and it is used with antibiotics to eradicate H. pylori infection. It also treats rare acid-hypersecretory disorders like Zollinger-Ellison syndrome and can lower the risk of NSAID-related stomach ulcers.

  • Duodenal and gastric ulcer healing

  • Erosive esophagitis and GERD

  • H. pylori eradication (triple therapy)

  • Zollinger-Ellison syndrome and hypersecretory conditions

  • Reduces risk of NSAID-associated gastric ulcers

Pepcid

Pepcid treats active duodenal and gastric ulcers, symptomatic non-erosive GERD, and erosive esophagitis confirmed by biopsy. It also treats pathological hypersecretory conditions such as Zollinger-Ellison syndrome and helps reduce the risk of duodenal ulcer recurrence.

  • Duodenal and gastric ulcer treatment

  • Non-erosive GERD symptom relief

  • Erosive esophagitis diagnosed by biopsy

  • Zollinger-Ellison syndrome and hypersecretory conditions

  • Reduces risk of duodenal ulcer recurrence

Prevacid vs. Pepcid Pros and Cons

Prevacid

Prevacid provides stronger, longer-lasting acid suppression than Pepcid, making it a common choice for healing erosive damage and ulcers. It is available over-the-counter and by prescription in capsule, dissolving tablet, and IV forms, but long-term daily use carries its own risks.

Pros

  • Stronger acid suppression, better for healing erosive damage

  • Available as capsule, dissolving tablet (SoluTab), or IV

  • FDA-approved for H. pylori eradication and NSAID-ulcer prevention

  • Available over-the-counter as well as by prescription

Cons

  • Long-term use linked to fracture risk and fundic gland polyps

  • Takes one to four days to reach full effect

  • Carries a Clostridioides difficile diarrhea warning

  • Not approved for infants under 1 year old

Pepcid

Pepcid works faster than Prevacid, easing symptoms within about an hour, which makes it useful for as-needed dosing. It does not carry the long-term bone or vitamin risks tied to PPIs, but it suppresses acid less completely and usually needs twice-daily dosing.

Pros

  • Starts working within about an hour

  • No long-term bone fracture or vitamin B12 warnings

  • Approved for children weighing 40 kg or more

  • Can be used on an as-needed basis for occasional symptoms

Cons

  • Less complete acid suppression than a PPI

  • Usually needs twice-daily dosing for ulcers and GERD

  • Can cause confusion or other CNS effects in elderly or kidney-impaired patients

  • Effectiveness may lessen with continuous long-term use

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