Compare Pepcid vs. Omeprazole

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Pepcid (Famotidine)

Prescription or OTC

Prilosec (Omeprazole)

Prescription or OTC
Relieves heartburn.

Pepcid (Famotidine) works well for heartburn but may not last as long or start working as quickly as other antacids.

3.7/ 5 average rating with 853 reviewsforPepcid
Treats heartburn and stomach ulcers.

Prilosec (Omeprazole) gives you long-lasting heartburn relief. Choose the cheapest proton pump inhibitor because they all work equally well for heartburn.

4.0/ 5 average rating with 1167 reviewsforOmeprazole
Upsides
  • Most people can take Famotidine without any noticeable day-to-day side effects.
  • Famotidine lasts longer than many other antacids like Maalox and Tums, and you only need to take it once or twice a day.
  • You can take it in combination with a quick-acting antacid (like Maalox or Tums) if you need relief right away.
  • Available as both a generic and over-the-counter option, so it's pretty affordable.
  • Few drug interactions.
  • Most people can take Omeprazole without any noticeable day-to-day side effects.
  • Omeprazole lasts longer than other types of antacids (like Zantac, Pepcid, or Tums), and you only need to take it once or twice a day.
  • You can take it in combination with a quick-acting antacid (like Maalox or Tums) if you need relief right away.
  • In studies it was better than a placebo (sugar pill) and as good as other proton pump inhibitors at treating heartburn.
  • Available as both a generic and over-the-counter option, so it's pretty affordable.
Downsides
  • Other antacids like Maalox, Tums, or Rolaids often start to work more quickly than Famotidine.
  • Medication like omeprazole (proton pump inhibitors) works better at healing and preventing stomach ulcers than medication like Famotidine (H2 blockers).
  • Can cause more serious side effects for people with kidney disease. Ask your doctor to give you a lower dose or choose a different option.
  • Doesn't start working as fast as some other antacids like Tums, Rolaids, or Maalox.
  • Like with other proton pump inhibitors, long-term use can cause weak or broken bones.
  • Can cause low levels of magnesium in the blood. You might need to take a magnesium supplement if you use Omeprazole long-term.
  • Although the generic is affordable, other medications might still be cheaper than Omeprazole.
  • Can interact with other drugs so be sure your doctor knows all the medicine you're taking before starting Omeprazole.
Used for
Dosage forms
  • Pill
  • Chewable tablet
  • Liquid
  • Extended release
Price
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Reviews
853 reviews so far
75%
saidit'sworth it
41%
saiditworked well
8%
saidit'sa big hassle

Have you used Pepcid (Famotidine)?

Leave a review
1167 reviews so far
80%
saidit'sworth it
59%
saiditworked well
8%
saidit'sa big hassle

Have you used Prilosec (Omeprazole)?

Leave a review
Side effects
2possible side effects
  • Headache
    5%
  • Diarrhea
    2%
See more detailed side effects
13possible side effects
  • Upper respiratory infection
    75%
  • Fever
    33%
  • Headache
    7%
  • Abdominal pain
    5%
  • Nausea
    4%
  • Diarrhea
    4%
  • Accidental injuries
    4%
  • Vomiting
    3%
  • Flatulence
    3%
  • Acid regurgitation
    2%
  • Constipation
    2%
  • Dizziness
    2%
  • Rash
    2%
See more detailed side effects
Risks and risk factors
  • Hiding possible cancer
  • Increased side effects
    • Current kidney disease
  • Allergic reaction
See more detailed risks and warnings
  • Hiding possible cancer
  • Severe stomach inflammation (atrophic gastritis)
    • Helicobacter pylori infection
    • Autoimmune disease
  • Severe diarrhea
    • Being hospitalized
    • Antibiotic use
  • Broken bones
    • Osteoporosis
    • Age 50 or older
    • Using high medication doses
    • Long-term therapy (1 year or more)
    • Smoking
    • Use of other medications that weaken bones
  • Low vitamin or mineral levels
See more detailed risks and warnings