Prilosec vs. Pepcid

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

Key Takeaways

  • Prilosec is a proton pump inhibitor usually taken once a day, while Pepcid is an H2 blocker that is often taken twice a day.

  • Both drugs treat ulcers and GERD, but Prilosec gives stronger, longer-lasting acid suppression and is FDA-approved for healing erosive esophagitis and H. pylori therapy.

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

Prilosec vs. Pepcid Drug Summary

Prilosec

Prilosec (omeprazole) is a proton pump inhibitor that reduces stomach acid production to treat duodenal and gastric ulcers, erosive esophagitis, and GERD. It is usually taken once daily as a delayed-release capsule, tablet, or oral suspension before a meal, though some conditions call for twice- or three-times-daily dosing. It is also combined with antibiotics to help eradicate H. pylori infection.

Pepcid

Pepcid (famotidine) is an H2 receptor antagonist that lowers stomach acid to treat duodenal and gastric ulcers, GERD, and erosive esophagitis. It is typically taken once daily at bedtime or twice daily depending on the condition, and it starts working within about an hour. It is also given at higher, individualized doses for hypersecretory conditions like Zollinger-Ellison syndrome.

Prilosec vs. Pepcid Side Effects

Prilosec

Most common
headache (up to 6.9%)
diarrhea (up to 4%)
abdominal pain (up to 5.2%)
nausea (up to 4%)

Pepcid

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

Prilosec vs. Pepcid Dosage

Prilosec

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily At the start
Maximum dose 120 mg three times daily If needed
Dose changes 4 increases As tolerated

Pepcid

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 40 mg once daily At the start
Maximum dose 20-160 mg every 6 hrs If needed
Dose changes 4 increases As tolerated

Prilosec vs. Pepcid Indications

Prilosec

Prilosec is FDA-approved to treat and heal duodenal ulcers, gastric ulcers, and erosive esophagitis caused by GERD, and to maintain that healing over time. It also treats symptomatic GERD and hypersecretory conditions like Zollinger-Ellison syndrome, and is combined with antibiotics to eradicate H. pylori.

  • Duodenal and gastric ulcer treatment

  • Erosive esophagitis healing and maintenance

  • Symptomatic GERD

  • H. pylori eradication (with antibiotics)

  • Zollinger-Ellison syndrome and other hypersecretory conditions

Pepcid

Pepcid is FDA-approved to treat active duodenal and gastric ulcers, non-erosive and erosive GERD, and to reduce the risk of duodenal ulcer recurrence. It is also approved for hypersecretory conditions like Zollinger-Ellison syndrome, using higher, individualized doses.

  • Duodenal and gastric ulcer treatment

  • Non-erosive and erosive GERD

  • Reducing duodenal ulcer recurrence

  • Zollinger-Ellison syndrome and other hypersecretory conditions

  • Pediatric use in patients 40 kg and above

Prilosec vs. Pepcid Pros and Cons

Prilosec

Prilosec offers strong, long-lasting acid suppression from a single daily dose, making it a common choice for healing erosive esophagitis and eradicating H. pylori. It is sold both over the counter and by prescription, and generic omeprazole is widely available. Long-term use carries some risks that are worth discussing with a provider.

Pros

  • Once-daily dosing for most approved uses

  • Stronger acid suppression, better for erosive esophagitis

  • FDA-approved for H. pylori eradication

  • Available both OTC and by prescription

Cons

  • Takes one to four days to reach full effect

  • Long-term use linked to fracture and C. diff risk

  • Not intended for immediate heartburn relief

Pepcid

Pepcid works faster than Prilosec, easing symptoms within about an hour, which makes it useful for on-demand relief alongside scheduled dosing. It comes in tablet, oral suspension, and injectable forms, giving more flexibility for hospitalized or pediatric patients. It generally carries fewer long-term risks than a PPI.

Pros

  • Starts working within about an hour

  • Available as tablet, oral suspension, and injection

  • Fewer long-term risks than PPIs, such as fracture or C. diff

  • OTC option (Pepcid AC) for occasional heartburn

Cons

  • Often needs twice-daily dosing for ulcers and GERD

  • Weaker acid suppression than a PPI

  • Dose must be lowered with kidney impairment

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