Mannitolo Galenica Senese (Mannitol)

Mannitol is used in clinical situations where rapid reduction of fluid pressure is required, acting primarily on the central nervous system and ocular compartments.

• Cerebral edema: lowers intracranial pressure to improve neurological outcomes.
• Acute glaucoma: reduces intra‑ocular pressure to preserve vision.
• Acute renal failure with oliguria: increases urine output to aid renal clearance.
• Toxic drug overdose: enhances renal excretion of certain nephrotoxic agents.

• Mannitol acts as an osmotically active agent that remains largely confined to the extracellular space after intravenous administration. By increasing plasma osmolality, it draws water from intracellular and tissue compartments into the vascular space, expanding plasma volume and creating an osmotic gradient that promotes diuresis and reduces pressure in confined compartments such as the brain and eye.

Mannitol may cause a range of adverse reactions, ranging from mild to severe, depending on patient factors and dosing.

Common Side Effects

• Headache: mild to moderate discomfort.
• Nausea or vomiting: gastrointestinal upset.
• Electrolyte imbalance: especially hyponatremia or hyperkalemia.
• Transient hypotension: due to rapid plasma volume expansion.
• Pulmonary edema: fluid overload in susceptible patients.

Serious or Rare Side Effects

• Acute renal failure: worsening kidney function.
• Severe electrolyte disturbances: leading to cardiac arrhythmias.
• Hemolysis: especially in patients with G6PD deficiency.
• Anaphylactoid reactions: rare hypersensitivity.
• Intracranial hemorrhage: if pressure changes are abrupt.

Mannitol administration requires careful assessment of patient condition and monitoring of fluid and electrolyte status.

• Renal function: assess baseline creatinine and urine output before use.
• Cardiovascular status: monitor blood pressure and heart rate during infusion.
• Electrolytes: check serum sodium, potassium, and osmolality regularly.
• Fluid balance: avoid excessive volume overload in patients with heart failure.
• Storage: Store at ambient temperature: keep in original container, protect from light and moisture.

Mannitol can interact with other agents that affect fluid balance, electrolytes, or renal function.

Major Interactions (Avoid)

• Loop diuretics: may exacerbate electrolyte loss and volume depletion.
• Nephrotoxic antibiotics (e.g., aminoglycosides): increase risk of renal injury.
• Insulin: may potentiate hypoglycemia due to altered glucose handling.

Moderate Interactions (Monitor Closely)

• Antihypertensives: may cause additive hypotensive effects.
• Lithium: altered renal clearance can raise lithium levels.
• Anticoagulants: volume shifts may affect coagulation parameters.