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Mannitol: uses, side effects & brands
Mannitol is an intravenous osmotic diuretic for raised brain or eye pressure. It belongs to the Diuretic (extra) group. These specialised diuretics are used for eye pressure, brain swelling or specific salt problems.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Diuretic (extra) |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- Reducing raised pressure in the brain, such as after head injury
- Reducing high eye pressure, such as in acute glaucoma or before eye surgery
- Increasing urine flow in certain hospital situations
Common brand names
- India: Mannitol IV
- Worldwide: Osmitrol
Common side effects
- Changes in body salts and fluid balance
- Headache or nausea
- Thirst
- Irritation at the drip site
Before taking it — precautions
- Given only in hospital with close monitoring
- Tell the doctor about heart failure or severe kidney disease
- Blood tests and urine output are watched during treatment
When to see a doctor urgently
- Breathlessness or swelling (fluid overload; urgent)
- Confusion or fits (urgent)
- Pain or swelling at the drip site
Not a prescription — no dose shown. The right dose of mannitol depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.
Frequently asked questions
Why is it given by drip?
It works by drawing fluid out of swollen tissue, which needs it to be in the bloodstream.
Why am I passing so much urine?
Mannitol is a strong water pill, so increased urine is expected.
Why are frequent blood tests needed?
To check salts, fluid balance and kidney function while it is given.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.