Osmosteril (Mannitol)

Osmosteril is an osmotic diuretic that acts on renal water handling and intracranial fluid dynamics.

• Acute kidney injury: facilitates osmotic diuresis to aid fluid removal.
• Cerebral edema: lowers intracranial pressure by drawing fluid from brain tissue.
• Glaucoma surgery: used intra‑operatively to maintain ocular hypotony.
• Intra‑operative renal protection: provides renal perfusion during brief periods of ischemia.
• Hyperosmolar therapy: serves as a hyperosmolar agent in selected emergency settings.

• Mannitol functions as an osmotic agent that does not readily cross cell membranes. When administered intravenously, it raises plasma osmolality, creating an osmotic gradient that pulls water from intracellular and interstitial compartments into the vascular space, increasing renal filtration and promoting diuresis. The resulting volume expansion also transiently reduces cerebral edema by drawing fluid out of brain tissue.

Mannitol may cause a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Headache: mild to moderate discomfort often reported after infusion.
• Nausea: occasional gastrointestinal upset.
• Electrolyte imbalance: shifts in sodium, potassium or calcium levels.
• Transient hypotension: brief drop in blood pressure during rapid infusion.
• Flank pain: discomfort in the kidney area.
• Polyuria: increased urine output.

Serious or Rare Side Effects

• Acute kidney injury: worsening renal function in susceptible patients.
• Pulmonary edema: fluid accumulation in the lungs.
• Severe electrolyte disturbances: hypernatremia or hyponatremia.
• Anaphylactoid reaction: rare hypersensitivity with rash or bronchospasm.
• Hemolysis: rare red‑cell destruction.
• Metabolic acidosis: disturbance in acid‑base balance.

When using Osmosteril, clinicians should assess patient risk factors and monitor relevant parameters.

• Renal function: evaluate baseline creatinine and glomerular filtration rate.
• Fluid balance: track input‑output charts to avoid overload.
• Electrolytes: monitor serum sodium, potassium and calcium levels.
• Cardiovascular status: watch for hypotension during rapid infusion.
• Pregnancy and lactation: consider risk‑benefit ratio before use.
• Store at below 25°C: keep in the original packaging, protect from moisture and direct sunlight.

Mannitol may interact with several concomitant medications, altering efficacy or safety.

Major Interactions (Avoid)

• Loop diuretics: combined use can precipitate profound electrolyte loss.
• Nephrotoxic antibiotics: increased risk of renal impairment.
• Vasopressors: may reduce the intended osmotic effect on cerebral pressure.

Moderate Interactions (Monitor Closely)

• ACE inhibitors: potential additive effect on blood pressure.
• Antihypertensive agents: may enhance hypotensive response.
• Lithium: altered renal clearance may increase lithium levels.