Famotidine: Uses, Dosage, Side Effects, and Interactions

What Is Famotidine?

Famotidine is a medicine used in the treatment of stomach ulcers, including gastric and duodenal ulcers. It is also used for erosive esophagitis (it is an esophageal lining inflammation and damage usually caused by stomach acid reflux) related to heartburn or acid indigestion and gastroesophageal reflux disease. Famotidine belongs to a group of medications called H2 (histamine) blockers. It works by reducing the amount of acid produced in the stomach.

What Is Famotidine Used For?

Famotidine is used in the following medical conditions:

• Heartburn or acid indigestion: Over-the-counter Famotidine helps relieve and prevent occasional heartburn, acid indigestion, and sour stomach.

• Gastroesophageal reflux disease: It treats GERD, a condition where stomach acid flows back into the esophagus, causing a burning feeling in the chest or throat, and may harm the esophagus lining.

• Stomach and intestinal ulcers: Famotidine is used to treat and prevent stomach and first-segment small intestine ulcers.

• Zollinger-ellison syndrome: It helps manage conditions that cause the stomach to produce unusually high levels of acid due to tumors.

When Should You Take Famotidine?

For heartburn, you can take Famotidine at least 15 minutes before eating. However, the cause of your acid reflux will determine when Famotidine is most effective. It is usually advised to take it before bed for ulcers and GERD. This aids in reducing the production of acid at night, when symptoms of acid reflux are most common.

How Does Famotidine Work? (Mechanism of Action)

Famotidine functions by lowering the amount of acid that the stomach lining's cells produce.

• Histamine release: Your body naturally produces many chemical signals when you eat, including histamine, which instructs the stomach to produce acid to aid in food digestion.

• Receptor binding: This histamine attaches itself to certain H2 receptors, which are found on the surface of the stomach's parietal cells. Hydrochloric acid is released into the stomach as a result of the binding activating proton pumps.

• Blocking the receptor: Famotidine competes with histamine to attach to these H2 receptors by acting as an antagonist.

• Decreased acid production: Famotidine dramatically reduces the amount and acidity of gastric secretions by successfully preventing histamine from binding to the receptors and interfering with the signal to the proton pumps.

Dosage and Administration

How should you take famotidine?

• You can take Famotidine orally with or without food.

• A healthcare provider will administer Famotidine injection as an infusion into a vein if you are unable to take the medicine orally.

• If taking a suspension, shake the bottle vigorously for five to 10 seconds before each use. Measure the liquid medicine carefully. Use the dosing syringe provided or a proper medicine dose-measuring device, not a kitchen spoon.

Available dosage forms

• Tablets: Available in strengths of 10 mg, 20 mg, and 40 mg. OTC versions are usually 10 mg or 20 mg, while higher doses often need a prescription.

• Chewable tablets: These are sold as an OTC option and are often part of combination products with antacids, such as Calcium carbonate and Magnesium hydroxide.

• Oral suspension (liquid): This is a powder mixed with water to create a liquid solution. It is commonly available in a concentration of 40 mg/5 mL (milligrams per millilitre) after reconstitution.

Adult dosage guidelines

• 40 mg once daily or 20 mg two times daily for active duodenal ulcers (DU). Up to eight weeks.

• 40 mg once daily for active stomach ulcers. Up to eight weeks.

• 20 mg twice a day for symptomatic non-erosive gastroesophageal reflux disease (GERD). Up to six weeks.

• 20 mg or 40 mg two times a day for erosive esophagitis. Up to 12 weeks at most.

• Conditions involving pathological hypersecretion: 20 mg every six hours is the initial dosage. 160 mg every six hours is the maximum recommended dosage.

• Lowering the chance of recurrent duodenal ulcers, 20 mg (milligrams) once a day. For one year or as recommended by a physician.

Pediatric dosage guidelines

• Birth to <3 months: 0.5 mg/kg once daily. This may increase to one mg/kg once daily if needed.

• 3 to <12 months: 0.5 mg/kg twice daily. This may increase to one mg/kg twice daily if needed.

• 1 to 16 years: 0.5 mg/kg daily, given once at bedtime or in two divided doses. This may increase to one mg/kg daily.

• ≥12 years: 10to 20 mg once or twice daily, taken 15 to 60 minutes before food.

• ≥40 kg (any age): Same as adult dosages for relevant conditions, such as active ulcer or erosive esophagitis.

What Should You Know About Missed Doses and Overdose Risks?

Missed dose

As soon as you remember, take the missed dosage. If your next dose is almost due, skip the missed one and go back to your usual schedule. Avoid taking two doses at once or taking additional doses to make up for lost time. This advice also applies to over-the-counter (OTC) Famotidine, which is typically taken as needed if your doctor has prescribed it regularly.

Over dose

Overdosing on Famotidine can result in hazardous levels of the medication in your body. Overdose symptoms may be more common in older adults and those with renal issues, and they are typically an extension of the known side effects. Famotidine overdose symptoms may include:

• Disorientation, agitation, or delusions (it is a mental health issue where a person has trouble distinguishing between what is real and what is imagined).

• Fatigue or lightheadedness (feeling extremely tired).

• Epilepsy (a brain condition that leads to frequent seizures).

• Severe soreness, weakness, or pain in the muscles.

• Issues with heart rhythm and rate.

What Are the Side Effects of Famotidine?

Common side effects

Adult adverse effects may consist of:

• Headache.

• Vertigo (feeling of spinning).

• Constipation (infrequent hard stool).

• Diarrhea (loose watery stools).

Additionally, children younger than a year old may exhibit the following:

• Agitation.

• Unusual restlessness.

• Unexplained crying.

Serious side effects

• Issues with heart rate and rhythm, such as shortness of breath, fainting, and dizziness.

• Erratic heart rhythm and rate.

• Severe issues with muscles, such as inexplicable muscle pain and weakness, and fever.

• Neurological issues such as anxiety, depression, and agitation.

• Difficulty falling asleep and seizures (electrical abnormal activity in the brain).

• Sexual issues, such as a diminished desire for sex.

Warnings And Precautions

Who should not take famotidine?

Patients who have experienced severe hypersensitivity reactions with Famotidine in the past should not take this medication.

What should you know before taking famotidine?

• If you are allergic to Famotidine, let your healthcare provider know before taking it.

• Before beginning Famotidine, tell your healthcare provider about any prescription and over-the-counter medicines, vitamins, dietary supplements, and herbal products you currently take or plan to take.

• Inform your physician if you have renal disease or phenylketonuria (PKU) (a rare inherited disorder that causes accumulation of an amino acid called phenylalanine in the body).

What Interactions Can Occur With Famotidine?

1. Drug interactions

Famotidine lowers intragastric acidity; it can decrease the absorption of other medications, which can result in the concurrent medication losing its effectiveness. It is not advised to take Dasatinib, Fosamprenavir, Cefditoren, or Delavirdine mesylate concurrently. For instructions on how to administer other medications, such as Atazanavir, Erlotinib, Ketoconazole, Itraconazole, Ledipasvir or Sofosbuvir, Nilotinib, and Rilpivirine, that depend on the pH of the stomach for absorption, see their prescribing information for proper guidance.

2. Food interaction

Your stomach may become irritated by some foods and drinks. Your symptoms may worsen as a result of this discomfort. While using this medication, your doctor might advise you to stay away from fatty, acidic, or spicy foods. Tomatoes and citrus fruits are examples of acidic foods. They may also advise you to avoid caffeine-containing beverages.

Famotidine Use During Pregnancy And Breastfeeding

1. Is Famotidine safe during pregnancy?

While most research has found no danger of birth defects, Famotidine is considered to be safe during pregnancy to treat heartburn, though research indicates that there may be higher preterm birth rates or low birth weight. Therefore, a consultation with a physician is recommended to take it appropriately, always starting with modifications in lifestyle and using low doses if needed. Always weigh up the benefits and disadvantages with your healthcare physician.

2. Can you take Famotidine while breastfeeding?

A child who is breastfed may experience adverse consequences if Famotidine finds its way into breast milk. If you nurse your child, consult your physician. You might have to choose between stopping this medicine and stopping nursing.

How Should You Store Famotidine?

Store Famotidine tablets and suspension at room temperature, between 68°F and 77°F (Fahrenheit) (20°C and 25 °C) (Celsius). They can handle temperatures between 59°F and 86°F (15°C and 30 °C) for short times, such as during transport. Keep them in a cool, dry place. Protect from moisture. Do not freeze. Dispose of the suspension if unused after 30 days.

Conclusion

Famotidine treats heartburn, ulcers, and other issues caused by excess stomach acid. You can get it by prescription or over-the-counter (OTC). It acts by lowering the amount of acid produced by your stomach. Headache, vertigo, constipation, and diarrhea are typical adverse effects. Tell your doctor about your medications and any health problems before taking Famotidine. To know more about this medication, connect with our healthcare specialist.

Key Takeaways

• Famotidine reduces gastric acid secretion and is used to treat gastrointestinal issues caused by excess acid production.

• Since Famotidine is mainly cleared by the kidneys, individuals with poor kidney function may face a higher risk of toxicity.

• You can take Famotidine with or without food.

• Take this medicine as recommended by your doctor.