Prilosec vs. Zantac 360

See how Prilosec and Zantac 360 compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Prilosec is a proton pump inhibitor that treats and heals underlying conditions like ulcers and erosive esophagitis, while Zantac 360 is an H2 blocker that only relieves occasional heartburn symptoms.

  • Zantac 360 can start working within about an hour, but Prilosec can take one to four days to reach full effect because it works by blocking acid production over time.

  • Prilosec requires a prescription for its full range of doses and uses, while Zantac 360 is available over the counter for short-term, as-needed relief.

Prilosec vs. Zantac 360 Drug Summary

Prilosec

Prilosec (omeprazole) is a proton pump inhibitor used to treat ulcers, erosive esophagitis, GERD, and rare acid hypersecretion disorders. It comes as a delayed-release capsule, tablet, or oral suspension, typically taken once or twice daily depending on the condition being treated.

Zantac 360

Zantac 360 (famotidine) is an over-the-counter H2 receptor antagonist used to relieve and prevent occasional heartburn from acid indigestion or sour stomach. It comes as a film-coated tablet taken as needed, with adults typically choosing between a 10 mg dose for mild symptoms or a 20 mg dose for stronger relief.

Prilosec vs. Zantac 360 Side Effects

Prilosec

Most common
Headache (up to 6.9%)
Abdominal pain (up to 5.2%)
Nausea (up to 4%)
Diarrhea (up to 4%)

Zantac 360

Most common
Headache (up to 1%)
Abdominal pain (up to 1%)
Nausea (up to 1%)
Diarrhea (up to 1%)

Prilosec vs. Zantac 360 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

Zantac 360

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 10 mg as needed At the start
Maximum dose 20 mg as needed If needed
Dose changes 1 increase As tolerated

Prilosec vs. Zantac 360 Indications

Prilosec

Prilosec is FDA-approved to treat duodenal and gastric ulcers, erosive esophagitis caused by GERD, and to maintain healing after erosive esophagitis clears. It's also used in combination therapy to eradicate H. pylori infection and to manage rare acid hypersecretion disorders like Zollinger-Ellison syndrome. Off-label, it's sometimes used for stress ulcer prevention in critically ill patients.

  • Duodenal and gastric ulcer treatment

  • Erosive esophagitis from GERD

  • Maintenance of healed erosive esophagitis

  • H. pylori eradication (combination therapy)

Zantac 360

Zantac 360 is FDA-approved to relieve heartburn from acid indigestion and sour stomach, and to prevent it when taken before trigger foods or drinks. It's intended for short-term, occasional use rather than chronic acid-related conditions requiring ongoing treatment. It isn't approved for children under 12 without a doctor's guidance.

  • Relief of heartburn from acid indigestion

  • Relief of sour stomach

  • Prevention of heartburn before trigger foods or drinks

  • Short-term, as-needed symptom control

Prilosec vs. Zantac 360 Pros and Cons

Prilosec

Prilosec treats the underlying cause of acid-related damage, including ulcers and erosive esophagitis, rather than just masking symptoms. It requires consistent daily dosing to reach full effect and is available both by prescription and over the counter as Prilosec OTC.

Pros

  • Treats underlying causes like ulcers and erosive esophagitis, not just symptoms

  • Available in capsule, tablet, and oral suspension, plus an OTC option

  • Used as part of H. pylori eradication therapy

  • Approved for rare acid hypersecretion disorders like Zollinger-Ellison syndrome

Cons

  • Not for immediate heartburn relief; can take 1 to 4 days for full effect

  • Long-term use linked to higher risk of bone fracture and C. diff infection

  • Higher doses and specialized regimens require a prescription

  • Roughly $15 to $95 per month without insurance, more than Zantac 360

Zantac 360

Zantac 360 works quickly to ease occasional heartburn but doesn't treat or heal underlying tissue damage the way a PPI does. It's sold over the counter for short-term use and isn't meant to replace prescription treatment for chronic acid conditions.

Pros

  • Works within about an hour for occasional heartburn relief

  • Available over the counter without a prescription

  • Simple as-needed dosing, with no titration schedule

  • Roughly $8 to $15 per month, less than Prilosec

Cons

  • Only relieves symptoms; does not treat ulcers or heal esophagitis

  • Not intended for symptoms lasting more than 14 days

  • Not recommended for children under 12 without medical guidance

  • May be less effective for severe or chronic acid-related conditions

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