Famotidine (Pepcid): Uses, Warnings, and More
Quick summary Famotidine is an H2 receptor antagonist used for conditions related to excess stomach acid, including gastric ulcer, GERD, Zollinger-Ellison syndrome, and heartburn. Brand names listed in the source include Pepcid, Pepcid AC,...
This content is for educational purposes only and does not replace medical advice, diagnosis or treatment from a qualified healthcare professional.
Quick summary
Famotidine is an H2 receptor antagonist used for conditions related to excess stomach acid, including gastric ulcer, GERD, Zollinger-Ellison syndrome, and heartburn. Brand names listed in the source include Pepcid, Pepcid AC, Heartburn Relief, and Fluxid.
Medical disclaimer:
This article is for general educational purposes only. It does not replace the official medication guide, a pharmacist’s advice, or a clinician’s evaluation. If symptoms are severe, persistent, or worsening, seek medical care.
What is famotidine?
Famotidine is an active ingredient used to reduce stomach acid. The source content lists its use in gastric ulcer, GERD, Zollinger-Ellison syndrome, and heartburn.
In the United States, the brand names mentioned in the source are Pepcid, Pepcid AC, Heartburn Relief, and Fluxid.
How famotidine works
Famotidine begins acting quickly after oral administration. At recommended doses, it has a prolonged effect at relatively low blood concentrations.
According to the source, famotidine decreases the acid and pepsin content and reduces the volume of basal, nocturnal, and stimulated gastric secretion.
Uses and therapeutic indications
The source lists famotidine for the following uses:
- Duodenal ulcer
- Benign gastric ulcer
- Hypersecretory syndromes such as Zollinger-Ellison syndrome
- Prevention of duodenal ulcer recurrence
- Prevention of recurrence of benign gastric ulcer
- Symptomatic treatment of GERD that has not responded to hygienic-dietary measures and antacids
- Esophagitis due to gastroesophageal reflux
- Relief and symptomatic treatment of heartburn in adults and children over 16 years of age
Dosage information from the source
Oral use only. The following dosing information appears in the original content and should be verified against the official product leaflet or a healthcare professional before use.
| Condition | Source dosing information |
|---|---|
| Duodenal ulcer | Initial: 40 mg/24 h at night or 20 mg/12 h, for 4–8 weeks. Maintenance to reduce recurrences: 20 mg/24 h at night; minimum 1 year. |
| Benign gastric ulcer | 40 mg/24 h at night, for 4–8 weeks. Maintenance to reduce recurrences: 20 mg/24 h at night; minimum 1 year. |
| GERD | 20 mg/12 h. |
| Esophagitis due to gastroesophageal reflux | 40 mg/12 h. If there is no response after 4–8 weeks, endoscopic diagnosis should be made. |
| Zollinger-Ellison syndrome | 20 mg/6 h; maximum 800 mg/day. |
| Heartburn and burning sensation | Over 16 years: 10 mg when symptoms are present or 10 mg 1 hour before eating; maximum 20 mg/day; maximum 1 week. |
| Kidney failure | If Clcr < 50 ml/min, reduce to half dose or increase the interval between doses to 36–48 hours. |
How it is administered
Famotidine is given by oral route according to the source content.
Contraindications
The source lists hypersensitivity to famotidine and other H2 receptor antagonists as a contraindication.
Warnings and precautions
- Rule out gastric neoplasia before starting treatment.
- Safety and efficacy in children have not been established.
- Use caution in elderly people.
- Gradually stop treatment.
- Use caution in kidney failure or moderate to severe liver failure.
- Maximum duration of treatment for heartburn in the source is 1 week.
- Stop treatment and re-evaluate the clinical situation if symptoms persist or worsen.
Liver and kidney considerations
The source advises caution in moderate or severe liver failure.
For kidney failure, the source recommends caution in moderate or severe renal impairment and dose adjustment when Clcr is below 50 ml/min.
Interactions
The original content lists the following interactions and administration considerations:
- Decreased absorption of ketoconazole and itraconazole; famotidine should be given 2 hours later.
- Decreased absorption with antacids; spacing of 1 hour is mentioned.
- Risk of loss of efficacy of calcium carbonate when used as a chelator in hemodialysis patients.
- Laboratory considerations: do not administer during the 24 hours before a gastric acid secretion test; may cause false-negative skin tests with allergen extracts; possible increase in serum transaminases.
Pregnancy and breastfeeding
The source says famotidine is not recommended in pregnancy unless absolutely necessary, and that the benefit-risk balance should be assessed.
Famotidine has been detected in breast milk. The source states that breastfeeding mothers should discontinue treatment with famotidine or stop breastfeeding.
Effects on driving and machinery
No effects are expected according to the source, but if dizziness, fatigue, or drowsiness occur, driving or using dangerous machinery should be avoided.
Possible side effects
The source lists the following adverse reactions:
- Headache
- Dizziness
- Diarrhea
- Constipation
FAQ
▸ What is famotidine used for?
The source lists famotidine for gastric ulcer, GERD, Zollinger-Ellison syndrome, heartburn, and related acid-related conditions.
▸ Is famotidine the same as Pepcid?
Pepcid is one of the brand names mentioned in the source for famotidine.
▸ Can famotidine be used for heartburn?
Yes, the source includes relief and symptomatic treatment of heartburn in adults and children over 16 years of age.
▸ What should I check before using famotidine?
Check the official medication guide and confirm whether your symptoms need medical evaluation, especially if they persist, worsen, or are accompanied by other concerning signs.
▸ Does famotidine interact with other medicines?
The source mentions interactions with ketoconazole, itraconazole, antacids, and calcium carbonate in certain settings, plus some laboratory test considerations.
▸ Is famotidine safe in pregnancy or breastfeeding?
The source advises caution in pregnancy and notes that famotidine is detected in breast milk. A clinician should assess the benefit-risk balance in these situations.
Safety reminder:
If symptoms persist, worsen, or return after treatment, seek medical advice and review the official leaflet or medication guide. Do not rely on this page alone for treatment decisions.
Sources and references
The original content states that the information was prepared using clinical and molecular data from medicines authorized and marketed in the United States under the Unique Ingredient Identifier (UNII) by the FDA Substance Registration System and the United States Pharmacopeia (USP).
Medical disclaimer
This content is for educational purposes only. It should not be used as a substitute for professional medical advice, diagnosis or treatment. Always ask a doctor, pharmacist or qualified healthcare professional before starting, stopping or changing any medicine.
Sources and verification
The following sources or official references are listed to support verification of the medicine information discussed in this article.
Medicine information can change and may vary depending on country, product formulation, patient history and professional guidance. Always check official medicine information and ask a healthcare professional for personal medical questions.