Mannit Fresenius (Mannitol)

Mannitol is used as an osmotic agent to manage conditions associated with elevated intracranial or intraocular pressure and to promote diuresis in renal impairment.

• Intracranial hypertension: lowers intracranial pressure and helps prevent cerebral edema.
• Intraocular hypertension: reduces intraocular pressure in acute glaucoma or ocular surgery.
• Acute renal failure: promotes diuresis to facilitate fluid removal and improve renal perfusion.

• Mannitol increases plasma osmolality by remaining largely extracellular after intravenous infusion. The resulting osmotic gradient draws water from intracellular and interstitial compartments into the vascular space, expanding plasma volume, reducing cerebral and ocular edema, and enhancing renal tubular flow to produce a diuretic effect.

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

Common Side Effects

• Headache
• Nausea or vomiting
• Transient hypotension
• Electrolyte disturbances (e.g., hyponatremia, hypokalemia)
• Flushing or feeling of warmth

Serious or Rare Side Effects

• Pulmonary edema
• Acute renal failure or worsening kidney function
• Severe hypernatremia
• Hemolysis in patients with G6PD deficiency
• Anaphylactic or severe allergic reactions

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

• Renal function: avoid or adjust use in patients with pre‑existing renal impairment.
• Cardiovascular status: monitor for volume overload and hypotension, especially in heart failure.
• Electrolytes: check serum sodium and potassium before and during therapy.
• Pregnancy and lactation: use only if clearly needed; safety data are limited.
• Concomitant diuretics: assess risk of excessive fluid loss.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake the vial.

Mannitol can interact with several medications, altering its efficacy or increasing risk of adverse events.

Major Interactions (Avoid)

• Loop diuretics (e.g., furosemide): may exacerbate electrolyte loss and renal dysfunction.
• Nephrotoxic agents (e.g., aminoglycosides, amphotericin B): increase risk of kidney injury.

Moderate Interactions (Monitor Closely)

• Insulin: rapid shifts in plasma osmolality can affect glucose control.
• Lithium: altered renal clearance may raise lithium levels.
• Antihypertensives: additive hypotensive effect may require dose adjustment.