Lansoprazole Accord-Uk (Lansoprazole)

Lansoprazole is a proton pump inhibitor used to manage acid‑related gastrointestinal disorders.

• Gastro‑oesophageal reflux disease (GERD): provides symptomatic relief by reducing stomach acid and healing esophageal irritation.
• Erosive esophagitis: promotes healing of damaged esophageal lining through sustained acid suppression.
• Peptic ulcer disease: facilitates ulcer healing and prevents recurrence by maintaining a low‑acid gastric environment.
• Helicobacter pylori eradication (as part of combination therapy): enhances the effectiveness of antibiotics by creating a less acidic stomach milieu.

• Lansoprazole selectively and irreversibly binds to the H+/K+ ATPase enzyme (the gastric proton pump) located on the secretory surface of parietal cells in the stomach. By inhibiting this final step of acid production, it markedly reduces basal and stimulated gastric acid secretion, leading to an increase in gastric pH and allowing damaged mucosa to heal. The inhibition persists for up to 72 hours, allowing once‑daily dosing in most patients.

Adverse reactions to lansoprazole vary in frequency and severity.

Common Side Effects

• Headache: mild to moderate intensity.
• Diarrhea: usually transient.
• Nausea: occasional.
• Abdominal pain: mild discomfort.
• Flatulence: increased gas.
• Constipation: reduced bowel movements.

Serious or Rare Side Effects

• Severe allergic reaction: anaphylaxis or angioedema.
• Clostridioides difficile-associated diarrhea: severe colitis.
• Elevated liver enzymes or hepatitis: monitor hepatic function.
• Hypomagnesemia: may cause muscle cramps or seizures.
• Stevens‑Johnson syndrome or toxic epidermal necrolysis: serious skin reactions.
• Interstitial nephritis or acute kidney injury: renal impairment.

Key safety considerations should be observed when prescribing lansoprazole.

• Renal function assessment: evaluate kidney function and consider dose adjustment in patients with severe renal impairment.
• Magnesium monitoring: periodically check serum magnesium levels, especially during long‑term treatment, to prevent deficiency.
• Hepatic impairment caution: use with care in patients with liver disease, as metabolism may be affected.
• Known hypersensitivity avoidance: discontinue immediately if signs of allergic reaction such as rash, itching, or swelling appear.
• Drug interaction vigilance: review all concomitant medications for potential interactions that may alter lansoprazole efficacy or safety.
• Store at room temperature: keep in the original container, protect from moisture and light, and do not exceed the expiry date.

Lansoprazole may affect the pharmacokinetics of several co‑administered drugs.

Major Interactions (Avoid)

• Clarithromycin: increased plasma levels may cause toxicity.
• Ketoconazole: reduced absorption leading to decreased efficacy.
• Atazanavir: markedly decreased antiretroviral concentrations.

Moderate Interactions (Monitor Closely)

• Warfarin: potential alteration of anticoagulant effect.
• Digoxin: possible increase in serum concentration.
• Methotrexate: reduced clearance may raise toxicity risk.