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
Pepcid
Prilosec vs. Pepcid Dosage
Prilosec
Pepcid
| 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 |
| 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
| 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
| 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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