Maxi-Kalz (Calcium Carbonate)

Maxi‑Kalz, a calcium carbonate supplement, is used to address conditions related to calcium deficiency and bone health.

• Calcium deficiency: helps restore adequate calcium levels in individuals with low dietary intake.
• Osteopenia: contributes to bone mineral density maintenance to slow progression.
• Post‑menopausal bone health: supports calcium needs during increased bone turnover.
• Pediatric growth: provides supplemental calcium for children with increased requirements.

• Calcium carbonate dissociates in the acidic environment of the stomach, releasing calcium ions (Ca2+). These ions are absorbed primarily in the small intestine and become available for incorporation into hydroxyapatite crystals, the structural component of bone. The increased extracellular calcium also participates in muscle contraction, nerve transmission, and enzymatic activation, supporting multiple physiological processes.

Calcium carbonate is generally well tolerated, but adverse reactions can occur.

Common Side Effects

• Constipation: mild to moderate difficulty passing stools.
• Flatulence: increased intestinal gas.
• Belching: frequent eructation after ingestion.
• Nausea: occasional feeling of queasiness.
• Abdominal discomfort: mild stomach pain or cramping.

Serious or Rare Side Effects

• Hypercalcemia: elevated blood calcium levels causing fatigue, confusion, or cardiac arrhythmia.
• Kidney stones: formation of calcium‑based calculi in susceptible individuals.
• Severe allergic reaction: rash, itching, swelling, or difficulty breathing.
• Acute pancreatitis: rare inflammation of the pancreas presenting with severe abdominal pain.

When using Maxi‑Kalz, consider the following safety measures.

• Assess total calcium intake: ensure combined dietary and supplemental calcium does not exceed recommended limits.
• Monitor serum calcium: periodic blood tests are advisable for patients with renal impairment or on interacting medications.
• Take with food: reduces gastrointestinal irritation and improves absorption.
• Avoid excessive vitamin D without supervision: high vitamin D can increase calcium absorption and risk of hypercalcemia.
• Check renal function: patients with kidney disease may have reduced calcium clearance.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Calcium carbonate can affect the absorption or action of several medicines.

Major Interactions (Avoid)

• Iron supplements: calcium reduces iron absorption; separate dosing by at least 2 hours.
• Bisphosphonates (e.g., alendronate): calcium interferes with drug uptake; administer on an empty stomach.
• Tetracycline antibiotics: calcium chelates the drug, lowering its effectiveness.
• Levothyroxine (thyroid hormone): calcium impairs absorption; schedule dosing apart.

Moderate Interactions (Monitor Closely)

• Vitamin D supplements: may increase calcium absorption, requiring monitoring of serum calcium.
• Loop diuretics: can enhance calcium excretion, potentially altering calcium balance.
• ACE inhibitors: combined effect on renal calcium handling may need observation.