Medicines & Supplements A to Z > Mannitol


Last updated on 12/07/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  




DRUG CLASS: Diuretics

SUB CLASS: Osmotic diuretics

USED FOR: Oedema, kidney failure, kidney function test

–  20% (injections)

What is Mannitol for?

Mannitol belongs to a class of medications called osmotic diuretics. It works by drawing water out from your body via an osmotic gradient, resulting in an increase in the volume of your urine output. Mannitol can be used to treat oedema and kidney failure. It is also used for kidney function tests.

How to use it?

Mannitol is injected through a needle into a vein as directed by your doctor. Your dose will be adjusted based on your response and the fluid content in your body.

What are the side effects of Mannitol?

Common side effects of Mannitol include headache, cough, vomiting, renal failure and electrolyte imbalance.

Who should not take Mannitol?

– People allergic to Mannitol or any ingredient of the formulation
– Patients with severe dehydration, heart failure or pulmonary oedema
– Patients with anuria (reduced urine production)

Pharmacist Tips:

Common dosing schedule:
Your doctor will advise you on the dosage depending on your condition.

Some common medications Mannitol may interact with:

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Mannitol in Hong Kong?

In Hong Kong, Mannitol is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Mannitol in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.