Mannitol Injection

What is Mannitol Injection?
Mannitol Injection is a sterile, non-pyrogenic solution of Mannitol in Water for Injection.2 It is a highly effective osmotic diuretic and a renal vasodilator.3 It is widely used in critical care and emergency settings to draw excess fluid from tissues (especially the brain and eyes) into the bloodstream to be excreted by the kidneys.4
 
Uses of Mannitol Injection
Reduction of intracranial pressure (ICP) and management of cerebral edema (brain swelling) following head trauma or neurosurgery.5
 
Reduction of elevated intraocular pressure (IOP) in patients with acute glaucoma.6
 
Promotion of diuresis to prevent or treat the oliguric phase of acute renal failure before irreversible damage occurs.7
 
Promotion of urinary excretion of toxic substances (forced diuresis) in cases of drug poisoning or overdose.8
 
Use as an irrigating solution during transurethral resection of the prostate (TURP) to minimize hemolytic effects.9
 
How Does Mannitol Injection Work?
Mannitol is a sugar alcohol that remains in the extracellular space and is not reabsorbed by the kidney tubules.10 It works by increasing the osmotic pressure of the glomerular filtrate, which prevents the reabsorption of water.11 This results in an increased flow of water out of the tissues and into the tubular fluid, which is then excreted as urine.12
 
FAQs on Mannitol Injection
1. Why does Mannitol sometimes show crystals in the bottle?
Mannitol solutions, especially in 13$20\%$ and 14$25\%$ concentrations, have a tendency to crystallize when exposed to low temperatures.15 If crystals are present, the bottle should be warmed (e.g., in a water bath) and shaken until the crystals dissolve.16 The solution must be cooled to body temperature and checked for clarity before administration.
2. Is a filter required for administering Mannitol?
Yes, it is highly recommended (and often mandatory for 17$20\%$ and 18$25\%$ concentrations) to use an in-line IV filter.19 This is a safety precaution to ensure that any microscopic crystals that may have formed are not injected into the patient’s bloodstream.
3. Can Mannitol be used in patients with heart failure?
Mannitol must be used with extreme caution in patients with congestive heart failure.20 Because it draws fluid into the intravascular space, it rapidly increases blood volume, which can overload the heart and lead to acute pulmonary edema.
4. How is the effectiveness of Mannitol monitored?
The primary monitoring parameters include urine output (to ensure the kidneys are responding), serum electrolytes (to prevent imbalances), and blood pressure. In neurosurgical cases, neurological status and ICP levels are closely tracked.
Therapeutic Category
Others (Osmotic Diuretics / Genitourinary)
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