Manitol Viaflo Baxter Czech Spol (Mannitol)

Manitol is used in several clinical situations that require rapid osmotic fluid shifts.

• Intracranial pressure elevation: Reduces cerebral edema and lowers intracranial pressure.
• Acute renal failure: Enhances renal perfusion and promotes urine output.
• Glaucoma: Lowers intraocular pressure during acute attacks.
• Diuresis promotion: Facilitates fluid removal in patients needing controlled diuresis.

• Mannitol acts as an osmotic agent that does not readily cross intact cell membranes. After intravenous infusion it raises plasma osmolarity, pulling water from intracellular and interstitial spaces into the vascular compartment. The increased osmotic load is filtered by the kidneys, creating a tubular gradient that limits water reabsorption, producing diuresis, while the resulting fluid shift from the brain and eye reduces intracranial and intraocular pressure.

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

Common Side Effects

• Headache: mild to moderate intensity.
• Nausea or vomiting: gastrointestinal upset.
• Electrolyte imbalance: especially hyponatremia or hypernatremia.
• Transient hypotension: due to rapid plasma volume expansion.
• Fluid overload: in patients with compromised cardiac function.

Serious or Rare Side Effects

• Acute renal failure: worsening kidney function.
• Pulmonary edema: fluid accumulation in lungs.
• Severe electrolyte disturbances: such as hyperkalemia.
• Anaphylactoid reactions: rare hypersensitivity.
• Hemolysis: in patients with G6PD deficiency.

When using mannitol, clinicians should observe specific precautions to minimize risks and ensure optimal therapy.

• Renal function assessment: evaluate baseline creatinine and urine output before initiation.
• Cardiovascular status: monitor for signs of fluid overload or heart failure.
• Electrolyte monitoring: check serum sodium, potassium, and osmolality regularly.
• Neurological monitoring: assess intracranial pressure trends and neurological status.
• Pregnancy and lactation: use only if potential benefits justify potential risks, as safety data are limited.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Mannitol can interact with several medicines, altering its efficacy or increasing toxicity.

Major Interactions (Avoid)

• Loop diuretics (e.g., furosemide): may cause excessive diuresis and electrolyte loss.
• Nephrotoxic agents (e.g., aminoglycosides, amphotericin B): increased risk of renal impairment.

Moderate Interactions (Monitor Closely)

• Antihypertensives: additive hypotensive effect.
• Insulin or oral hypoglycemics: altered glucose control due to fluid shifts.
• Lithium: risk of lithium toxicity from altered renal clearance.
• Anticoagulants: potential for increased bleeding if renal function declines.