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This is an information resource — not medical advice.

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H2 Receptor Antagonist (H2 Blocker)✓ Over-the-counter

What Is Famotidine (Pepcid) Used For?

Brand names: Pepcid, Pepcid AC

Famotidine is an H2 blocker that reduces stomach acid. It works faster than PPIs like omeprazole and is available over the counter for heartburn relief.

What is Famotidine used for?

Heartburn and acid indigestion (OTC)
GERD (gastroesophageal reflux disease)
Stomach ulcers (gastric and duodenal)
Zollinger-Ellison syndrome
Prevention of stress ulcers in hospitalised patients

How does Famotidine work?

Famotidine blocks H2 histamine receptors on stomach cells, which reduces the production of stomach acid. Unlike PPIs, it works within 1–3 hours and doesn't require activation by food intake.

Dosage information

💊Available forms

10mg tablets (OTC)
20mg tablets
40mg tablets
10mg/ml suspension
20mg IV (hospital use)

📏Typical dosage

OTC heartburn: 10–20mg up to twice daily. Prescription ulcer treatment: 20–40mg twice daily or 40mg at bedtime. Take 15–60 minutes before meals that cause symptoms.

⚠️ Dosage varies by individual. Always follow your doctor's or pharmacist's instructions — never self-dose based on general information.

Side effects

Common

Headache
Dizziness
Constipation
Diarrhea
Fatigue

⚠️ Serious — contact your doctor

Confusion and agitation (especially in elderly or with kidney disease)
QT prolongation at high doses
Severe allergic reactions (rare)
Low platelet count (rare)

Important warnings

Dose reduction needed in kidney disease

Can cause confusion in elderly patients — monitor

Consult a doctor before use if symptoms have persisted more than 2 weeks

Not for immediate relief during an active heartburn episode — takes 1–3 hours to work

Drug interactions

These substances may interact with Famotidine. This is not a complete list — always tell your doctor and pharmacist ALL medications and supplements you take.

Antacids (take 2 hours apart — reduce absorption)Itraconazole and ketoconazole (need acidic stomach to absorb)Atazanavir (HIV medication)Cefpodoxime and cefuroxime (reduced absorption)

Pregnancy & breastfeeding

🤰 Generally considered safe — discuss with your doctor

Always consult your doctor or obstetrician before taking any medication during pregnancy or while breastfeeding.

Frequently asked questions

What is famotidine (Pepcid) used for?

Famotidine reduces stomach acid and treats heartburn, GERD, and peptic ulcers. It is available OTC for short-term heartburn relief.

What's the difference between famotidine (Pepcid) and omeprazole (Prilosec)?

Famotidine (H2 blocker) works within 1–3 hours and is better for on-demand relief or mild symptoms. Omeprazole (PPI) takes longer to work but provides stronger, longer-lasting acid suppression — better for severe GERD and healing ulcers.

Can I take famotidine every day?

OTC famotidine should not be used daily for more than 2 weeks without consulting a doctor. Prescription use for ulcers is monitored. Long-term use is generally safer than PPIs but should still be reviewed by a doctor.

When should I take famotidine?

For heartburn prevention: take 15–60 minutes before a meal that typically causes symptoms. For general GERD: once or twice daily. It doesn't need to be taken on an empty stomach like PPIs.

Is famotidine safe during pregnancy?

Famotidine is generally considered safe in pregnancy and is often recommended over PPIs for treating heartburn in pregnant women. Always confirm with your obstetrician.

Related medications

💊OmeprazoleProton Pump Inhibitor (PPI)💊PantoprazoleProton Pump Inhibitor (PPI)💊IbuprofenNSAID 💊AspirinNSAID / Antiplatelet Agent

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This is an information resource — not medical advice.

🚨 If you are experiencing a medical emergency or think you may have taken too much of a medication, call emergency services (911 in the US) or go to your nearest emergency room immediately.

Information on this page is sourced from general pharmaceutical references and is provided for educational purposes only. Drug information may change — always verify with your pharmacist or prescriber. PillCodex.com is not affiliated with any pharmaceutical company.