Magnesium Oxide Rafarm (Magnesium Oxide)

Magnesium oxide is used to address conditions related to low magnesium levels, excess gastric acidity, and impaired bowel movements.

• Magnesium deficiency: restores normal serum magnesium concentrations.
• Dyspepsia (acid indigestion): neutralizes gastric acid to relieve heartburn and upper abdominal discomfort.
• Constipation: increases intestinal water content, facilitating stool passage.
• Hypomagnesemia associated with diuretic therapy: supplies magnesium to counteract drug‑induced losses.
• Magnesium supplementation in athletes: supports muscle function and electrolyte balance during intense physical activity.
• Adjunct in osteoporosis management: contributes to bone mineralization when combined with calcium and vitamin D.

• Magnesium oxide dissociates in the gastrointestinal tract to release magnesium ions (Mg2+). The ions are absorbed through active transport and passive diffusion, raising systemic magnesium levels. In the stomach, magnesium ions neutralize hydrogen ions, increasing pH and reducing acidity. In the intestines, the osmotic activity of unabsorbed magnesium draws water into the lumen, softening stool and stimulating peristalsis. The increased magnesium also participates in enzymatic reactions that support neuromuscular function.

Magnesium oxide may cause a range of adverse reactions, most of which are mild and dose‑related.

Common Side Effects

• Diarrhea: loose stools due to osmotic effect.
• Abdominal cramping: discomfort from increased intestinal motility.
• Nausea: mild stomach upset.
• Flatulence: excess gas production.
• Vomiting: occasional expulsion of stomach contents.
• Metallic taste: transient taste alteration.

Serious or Rare Side Effects

• Hypermagnesemia: elevated serum magnesium leading to muscle weakness, low blood pressure, or cardiac arrhythmia.
• Severe allergic reaction: rash, itching, swelling, or difficulty breathing.
• Electrolyte imbalance: significant shifts in calcium or potassium levels.
• Kidney dysfunction: accumulation of magnesium in patients with severe renal impairment.
• Severe hypotension: marked drop in blood pressure due to vasodilatory effect.

When using magnesium oxide, certain precautions should be observed to minimize risks and ensure safe administration.

• Assess renal function: avoid use or adjust dose in patients with severe kidney impairment.
• Monitor serum magnesium: check levels periodically, especially in long‑term therapy.
• Review concomitant medications: consider potential interactions with drugs affecting electrolyte balance.
• Caution in gastrointestinal disorders: use carefully in patients with bowel obstruction or severe diarrhea.
• Pregnancy and lactation: limited data; use only if benefit outweighs potential risk.
• Store at ambient temperature: keep below 25 °C in the original container, protect from moisture and direct sunlight.

Magnesium oxide can affect the absorption or action of several medicines; awareness of these interactions helps prevent therapeutic failure or toxicity.

Major Interactions (Avoid)

• Tetracycline antibiotics: reduced absorption; separate dosing by at least 2 hours.
• Bisphosphonates: decreased bioavailability; administer on an empty stomach and separate from magnesium.
• Potassium-sparing diuretics: risk of hypermagnesemia; avoid concurrent high‑dose use.
• Oral iron supplements: magnesium reduces iron absorption; separate dosing by at least 2 hours.

Moderate Interactions (Monitor Closely)

• Calcium channel blockers: possible additive effect on blood pressure; monitor cardiovascular status.
• Digoxin: magnesium may alter serum levels; check digoxin concentration periodically.
• Loop diuretics: increased renal magnesium loss; monitor serum magnesium.
• Anticoagulants (warfarin): magnesium may affect INR; monitor coagulation parameters.