Lanthanum Viatris (Lanthanum)

Lanthanum Viatris is a phosphate binder used to manage elevated serum phosphate in chronic kidney disease and related conditions.

• Chronic kidney disease with hyperphosphatemia: lowers serum phosphate levels to within target range.
• Patients on dialysis with hyperphosphatemia: helps control phosphate load from diet and dialysis.
• Renal transplant recipients with hyperphosphatemia: assists in maintaining phosphate balance while preserving graft function.

• Lanthanum binds dietary phosphate in the gastrointestinal tract, forming insoluble lanthanum phosphate complexes that are not absorbed. This reduces the amount of phosphate available for intestinal uptake, thereby decreasing serum phosphate concentrations in patients with impaired renal excretion.

Lanthanum may cause a range of adverse reactions, most of which are related to the gastrointestinal tract.

Common Side Effects

• Nausea: mild to moderate feeling of stomach upset.
• Constipation: reduced bowel movements, sometimes requiring dietary adjustment.
• Abdominal discomfort: cramping or pain in the stomach area.
• Flatulence: increased gas production.

Serious or Rare Side Effects

• Severe constipation leading to bowel obstruction: may require medical intervention.
• Allergic reactions: rash, itching, or swelling of the face, lips, or tongue.
• Hypercalcemia: elevated calcium levels, especially when used with calcium-containing products.
• Gastrointestinal bleeding: rare but potentially serious bleeding in the digestive tract.

When prescribing Lanthanum, clinicians should consider several safety measures to minimize risks.

• Monitor serum phosphate: adjust dose based on regular laboratory testing.
• Assess calcium balance: avoid concurrent high calcium intake that may cause hypercalcemia.
• Evaluate gastrointestinal health: patients with a history of bowel obstruction should use with caution.
• Adjust for renal function: dose may need modification in severe kidney impairment.
• Avoid in known hypersensitivity: discontinue if allergic signs appear.
• Store at below 25°C: keep in the original pack, protect from moisture.

Lanthanum can affect the absorption of other orally administered medicines, requiring attention to timing and monitoring.

Major Interactions (Avoid)

• Iron supplements: may bind to lanthanum, reducing its phosphate‑binding efficacy.
• Tetracycline antibiotics: lanthanum can decrease absorption, lowering antibiotic effectiveness.
• Levothyroxine: concurrent use may reduce thyroid hormone uptake.

Moderate Interactions (Monitor Closely)

• Vitamin D analogues: combined effect on calcium and phosphate balance should be monitored.
• Calcium carbonate: additive phosphate binding may increase risk of hypercalcemia.
• ACE inhibitors: monitor serum potassium and renal function when used together.