Medicines & Supplements A to Z > Fosfomycin


Last updated on 06/07/2021.

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

GENERIC NAME: Fosfomycin



DRUG CLASS: Antibiotics

SUB CLASS: Phosphonic acid

USED FOR: Urinary tract infections (UTIs)


What is Fosfomycin for?

Fosfomycin belongs to a class of medications called phosphonic acid antibiotics. It kills bacteria by interrupting the integrity of bacterial cell walls. Fosfomycin is used to treat urinary tract infections. Fosfomycin does not work for virus or fungus infections.

How to use it?

Fosfomycin is available as sachets that may be taken orally, with or without food. Pour sachet contents into a cup of water and stir until dissolved. Drink immediately after dissolving in water. Do not use hot water.

Treatment of uncomplicated urinary tract infections
A single 3 g dose mixed in 3-4 ounces of water, taken orally with or without food.

What are the side effects of Fosfomycin?

Common side effects of Fosfomycin include headache, dizziness, diarrhea, nausea and vomiting, stomach pain, dyspepsia, back pain and skin rash.

Who should not take Fosfomycin?

People allergic to Fosfomycin or any component of the formulation.

Pharmacist Tips:

– This medication can make you dizzy. If affected, do not drive or operate machinery.
– You must complete the entire course of this antibiotic, or else, the infection will not be properly controlled.

Common dosing schedule:
Fosfomycin may be taken with or without food.

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Fosfomycin may interact with:
– Beta-lactams, e.g. Penicillins and Cephalosporins
– Fluoroquinolone antibiotics, e.g. Linezolid, Moxifloxacin

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

Where to buy Fosfomycin in Hong Kong?

In Hong Kong, Fosfomycin 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 Fosfomycin 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.