Mannitol, Viaflo Baxter (Mannitol)

Mannitol is an osmotic diuretic used in conditions where reduction of fluid pressure is required.

• Intracranial pressure: lowers pressure to protect brain tissue.
• Cerebral edema: decreases brain swelling and improves neurological outcomes.
• Acute renal failure: promotes diuresis to aid renal clearance.
• Intraocular pressure: reduces pressure to help manage glaucoma and ocular emergencies.

• Mannitol increases the osmotic pressure of the extracellular fluid and renal tubular lumen. By creating an osmotic gradient, it draws water from intracellular and interstitial spaces into the vascular compartment, enhancing urinary output and lowering intracranial and intraocular pressures without directly acting on receptors.

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

Common Side Effects

• Headache: mild to moderate discomfort.
• Nausea or vomiting: gastrointestinal upset.
• Electrolyte imbalance: especially hyponatremia or hyperkalemia.
• Hypotension: transient drop in blood pressure.
• Tachycardia: increased heart rate.

Serious or Rare Side Effects

• Pulmonary edema: fluid accumulation in lungs.
• Severe dehydration: excessive fluid loss.
• Anaphylactic reaction: rare hypersensitivity.
• Acute renal failure worsening: in patients with pre‑existing kidney impairment.
• Cardiac arrhythmias: due to electrolyte disturbances.

When using Mannitol, clinicians should observe several safety measures.

• Renal function monitoring: assess creatinine and urine output.
• Electrolyte surveillance: check serum sodium, potassium, and osmolality.
• Fluid balance assessment: avoid over‑ or under‑hydration.
• Cardiovascular status: use cautiously in heart failure or hypotension.
• Intracranial lesions: evaluate risk of rapid pressure shifts.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Mannitol can interact with other medicines, requiring attention to avoid adverse outcomes.

Major Interactions (Avoid)

• Loop diuretics: may cause excessive diuresis and electrolyte loss.
• Insulin: can alter glucose control when fluid shifts occur.
• Lithium: increased risk of lithium toxicity.
• ACE inhibitors: heightened hypotensive effect.

Moderate Interactions (Monitor Closely)

• Antihypertensives: additive blood pressure lowering.
• NSAIDs: may impair renal clearance.
• Corticosteroids: can exacerbate fluid retention.
• Anticonvulsants: monitor for altered serum levels.