Famotidine
Over-the-counterWhat is Famotidine?
Famotidine is a medication that reduces the amount of acid your stomach produces. It belongs to a class of drugs called H2 blockers, which stands for histamine-2 receptor antagonists. This medication helps relieve the burning sensation and discomfort caused by excess stomach acid.
You can buy famotidine over the counter at most pharmacies, including Rite Aid. Lower doses are available without a prescription for treating occasional heartburn. Higher doses may require a prescription from your doctor for more severe conditions. Famotidine starts working within 30 to 60 minutes and can provide relief for up to 12 hours.
This medication has been used safely for decades to treat various acid-related stomach problems. It works differently than antacids, which neutralize acid after it forms. Instead, famotidine prevents your stomach from making excess acid in the first place. This makes it useful for both treating symptoms and preventing them from occurring.
Thank you for signing up.
You are on the list. We will reach out as soon as online pharmacy services are available.
Rite Aid pharmacy is back, now online
Get notified when online pharmacy services are available in your state.
Common uses
- Relief of heartburn associated with acid indigestion and sour stomach
- Prevention of heartburn brought on by eating or drinking certain foods and beverages
- Treatment of gastroesophageal reflux disease, also known as GERD
- Healing and prevention of stomach and intestinal ulcers
- Treatment of conditions where the stomach produces too much acid, such as Zollinger-Ellison syndrome
- Prevention of stress ulcers in hospitalized patients
How it works
Famotidine works by blocking histamine receptors in your stomach lining. When histamine attaches to these receptors, it signals your stomach cells to produce acid. By blocking this signal, famotidine reduces the amount of acid your stomach makes. This helps your stomach and esophagus heal from acid damage and prevents new irritation.
The medication affects only the histamine receptors in your stomach, not the ones involved in allergic reactions. This targeted action means you get acid relief without the drowsiness some allergy medications cause. Famotidine can reduce stomach acid production by up to 70 percent for several hours after taking it.
Taking Famotidine? Monitor your levels.
Screen for 1,200+ health conditions
Dosage information
For over-the-counter use, adults and children 12 years and older typically take 10 to 20 mg by mouth once or twice daily. To prevent heartburn, take one tablet 15 to 60 minutes before eating or drinking foods that cause symptoms. For relief of existing heartburn, take one tablet with water. Do not take more than 2 tablets in 24 hours unless directed by your doctor. Do not use the maximum dose for more than 2 weeks continuously without consulting a healthcare provider.
Side effects
- Headache
- Dizziness
- Constipation or diarrhea
- Nausea
- Stomach pain or cramping
- Fatigue or drowsiness
Serious side effects are rare but can occur. Seek medical attention immediately if you experience irregular heartbeat, severe dizziness, unusual bleeding or bruising, confusion, or signs of an allergic reaction such as rash, swelling, or difficulty breathing. Long-term use may be associated with vitamin B12 deficiency because reduced stomach acid can affect nutrient absorption.
Drug interactions
- Antacids containing aluminum or magnesium may reduce famotidine absorption if taken together
- May affect absorption of medications that require stomach acid, such as ketoconazole, itraconazole, and atazanavir
- Can interact with dasatinib, delavirdine, and certain cancer medications
- May increase or decrease levels of warfarin, a blood thinner
- Alcohol can increase stomach acid production and worsen symptoms
- Inform your doctor of all medications, supplements, and vitamins you take before starting famotidine
Blood test monitoring
If you use famotidine regularly for more than a few weeks, consider monitoring your vitamin B12 levels. Reduced stomach acid can make it harder for your body to absorb this important vitamin from food. Vitamin B12 is essential for nerve function, red blood cell production, and DNA synthesis. Low levels can cause fatigue, weakness, numbness, and memory problems.
Rite Aid offers convenient blood testing that includes vitamin B12 measurement along with over 200 other biomarkers. Regular monitoring helps you catch deficiencies early before they cause serious symptoms. If you have kidney problems, your doctor may also want to monitor your kidney function while taking famotidine, as the medication is cleared through the kidneys.
Taking Famotidine? Monitor your levels.
- Track how your body responds
- Catch side effects early with blood work
- Share results with your doctor
Frequently asked questions
Yes, famotidine is available over the counter at Rite Aid and other pharmacies. The OTC strength is typically 10 to 20 mg per tablet. Higher doses, such as 40 mg, require a prescription from your doctor for treating more serious conditions.
Famotidine usually starts working within 30 to 60 minutes after you take it. The effects can last for up to 12 hours. If you are taking it to prevent heartburn, take it 15 to 60 minutes before eating foods that typically cause symptoms.
You can take famotidine daily for up to 2 weeks for self-treatment of heartburn. If you need it for longer than 2 weeks, talk to your doctor. Long-term daily use is common for certain conditions but should be monitored by a healthcare provider to check for side effects and nutrient deficiencies.
You can take famotidine with or without food. If you are using it to prevent heartburn from meals, take it 15 to 60 minutes before eating. For treatment of existing symptoms, you can take it any time with a glass of water.
Famotidine reduces stomach acid, which your body needs to absorb vitamin B12 from food. Long-term use can lead to B12 deficiency, causing fatigue, weakness, and nerve problems. Regular blood testing can catch low levels early so you can address them with supplements or diet changes.
Famotidine is an H2 blocker that reduces acid production by blocking histamine receptors. Omeprazole is a proton pump inhibitor that blocks acid production more completely by stopping the final step of acid secretion. Famotidine works faster but may be less effective for severe acid problems than PPIs like omeprazole.
Famotidine is generally considered safe during pregnancy and is classified as pregnancy category B. Small amounts pass into breast milk but are unlikely to harm a nursing baby. Always consult your doctor before taking any medication during pregnancy or while breastfeeding to ensure it is appropriate for your situation.
If famotidine no longer controls your symptoms, see your doctor rather than increasing the dose on your own. You may need a stronger medication, a prescription-strength dose, or tests to check for underlying conditions. Persistent heartburn despite treatment can indicate GERD or other issues that need medical evaluation.
Yes, you can take antacids with famotidine if needed for quick relief. However, antacids containing aluminum or magnesium may reduce famotidine absorption if taken at the same time. Space them apart by at least 1 hour if you need both medications.
Famotidine does not typically cause weight gain. Most people tolerate it well for long periods. The main concern with extended use is potential vitamin B12 deficiency due to reduced stomach acid affecting absorption. Regular blood work can monitor for this and other issues if you use famotidine for months or years.