Lansoprazole Drug Profile

What is Lansoprazole?

Lansoprazole is a prescription medication belonging to the class of drugs known as proton pump inhibitors (PPIs). It is primarily used to reduce stomach acid production and treat various acid-related digestive disorders. This medication works by blocking the enzyme responsible for producing stomach acid, providing relief from conditions caused by excess gastric acid.

Uses

Lansoprazole is approved for several gastrointestinal conditions:

• Gastroesophageal reflux disease (GERD): Treats heartburn and acid reflux by reducing stomach acid that backs up into the esophagus
• Peptic ulcers: Helps heal stomach and duodenal ulcers by creating a less acidic environment that allows tissue to repair
• Helicobacter pylori eradication: Used in combination with antibiotics to eliminate H. pylori bacteria that can cause stomach ulcers
• Zollinger-Ellison syndrome: Manages this rare condition where tumors cause excessive stomach acid production
• Erosive esophagitis: Treats inflammation and damage to the esophagus caused by stomach acid exposure

How it works

Lansoprazole works by irreversibly blocking the hydrogen-potassium ATPase enzyme system, also known as the proton pump, in the stomach’s acid-producing cells. This enzyme is responsible for the final step in gastric acid production. By inhibiting this pump, lansoprazole significantly reduces the amount of acid the stomach produces, allowing damaged tissues to heal and preventing further acid-related injury.

Side effects

Common side effects include:

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• Headache
• Nausea and vomiting
• Diarrhea or constipation
• Abdominal pain
• Dizziness
• Fatigue
• Flatulence
• Dry mouth

Serious side effects to watch for:

• Severe diarrhea that may indicate C. difficile infection
• Bone fractures, particularly of the hip, wrist, or spine with long-term use
• Low magnesium levels causing muscle spasms, irregular heartbeat, or seizures
• Severe stomach pain that could indicate gastric tumors
• Kidney problems or acute interstitial nephritis

Warnings and precautions

Several important safety considerations apply to lansoprazole use:

• Long-term use risks: Extended use may increase the risk of bone fractures, vitamin B12 deficiency, and magnesium deficiency
• Pregnancy and breastfeeding: Classified as FDA pregnancy category B; should be used during pregnancy only when clearly needed and with caution during breastfeeding
• Liver impairment: Patients with severe liver disease may require dosage adjustments as the drug is metabolized in the liver
• Gastric malignancy: Should not be used to mask symptoms of gastric cancer; proper evaluation is needed before treatment
• Gradual discontinuation: Long-term users should not stop abruptly as this may cause rebound acid production

Interactions

Lansoprazole can interact with several medications and supplements:

• Warfarin: May increase bleeding risk by affecting warfarin metabolism
• Digoxin: Increased absorption of digoxin may lead to elevated blood levels and toxicity
• Atazanavir and other HIV protease inhibitors: Reduced absorption due to decreased stomach acidity
• Clopidogrel: May reduce the antiplatelet effectiveness by interfering with drug activation
• Iron supplements: Reduced iron absorption due to decreased stomach acid
• Vitamin B12: Long-term use may interfere with B12 absorption
• Calcium carbonate: Reduced calcium absorption may occur with chronic PPI use
• Methotrexate: May increase methotrexate levels, particularly at high doses

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Dosage

Typical adult dosages vary depending on the condition being treated. For GERD, the usual dose is 15-30 mg once daily before eating. Peptic ulcer treatment typically involves 15-30 mg daily for 4-8 weeks. For H. pylori eradication, 30 mg twice daily is commonly prescribed in combination with antibiotics for 10-14 days. Zollinger-Ellison syndrome may require higher doses of 60-90 mg daily, sometimes divided into multiple doses. All dosing should be individualized and determined by a healthcare provider based on the specific condition, severity, and patient response.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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