Mannitol, Viaflo Baxter (Mannitol)

Mannitol is employed as an osmotic diuretic in several clinical situations that require rapid fluid shift.

• Intracranial hypertension: reduces intracranial pressure by drawing water from brain tissue into the vascular compartment.
• Acute renal failure: promotes diuresis to facilitate renal clearance of waste products.
• Glaucoma: lowers intraocular pressure by osmotic dehydration of the vitreous humor.
• Intraocular pressure elevation: decreases pressure within the eye, aiding in the management of ocular hypertension.

• Intravenous Mannitol increases plasma osmolality, creating an osmotic gradient that pulls water from intracellular and tissue compartments into the extracellular space. The resulting plasma expansion enhances glomerular filtration, promotes renal excretion of water and electrolytes, and reduces pressure in confined compartments such as the cranial vault and the eye, thereby achieving its therapeutic effects.

Mannitol may be associated with a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Headache: mild to moderate intensity.
• Nausea and vomiting: gastrointestinal upset following infusion.
• Thirst or dry mouth: due to osmotic effect.
• Electrolyte disturbances: mild hyponatremia or hypernatremia.
• Transient hypotension: drop in blood pressure during rapid infusion.
• Tachycardia: increased heart rate secondary to volume shifts.

Serious or Rare Side Effects

• Pulmonary edema: fluid accumulation in lungs.
• Severe electrolyte imbalance: marked hypernatremia or hypokalemia.
• Acute renal failure worsening: reduced kidney function.
• Anaphylactic reaction: rare hypersensitivity.
• Hemolysis: destruction of red blood cells.
• Hyperosmolar coma: extreme plasma osmolality.

When using Mannitol, clinicians should observe several precautionary measures to minimize risk.

• Renal function: assess baseline renal performance and avoid use in anuric patients.
• Electrolytes: monitor serum sodium, potassium and osmolality before and during therapy.
• Cardiac status: use cautiously in patients with heart failure or volume overload.
• Fluid balance: avoid excessive infusion rates that may cause circulatory overload.
• Pregnancy: consider only if potential benefit justifies potential risk, as safety data are limited.
• Store at ambient temperature: keep in original container, protect from light and moisture.

Mannitol can interact with other medicines, influencing their efficacy or safety.

Major Interactions (Avoid)

• Loop diuretics: additive diuretic effect may cause profound electrolyte loss.
• Insulin: hyperosmolar state can impair glucose control.
• Nephrotoxic agents: increased risk of renal injury when combined.

Moderate Interactions (Monitor Closely)

• ACE inhibitors or ARBs: monitor blood pressure and renal function for additive effects.
• Antihypertensive drugs: potential for enhanced hypotension.
• Lithium: altered renal clearance may raise lithium levels.