Fosfomycin: uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 5 November 2026

Fosfomycin is a single-dose antibiotic for uncomplicated urinary infections. It belongs to the Antiprotozoal & other antimicrobial group. These treat protozoal gut infections (like amoebiasis and giardia) and some other infections.

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Drug type — dosing is set by your doctor

Measure	Range
Drug class	Antiprotozoal & other antimicrobial
Type	Prescription
Dose	Individual — ask your doctor or pharmacist

What it is used for

Treats uncomplicated bladder infections (cystitis) in women
Can work against some resistant urinary bacteria
An injectable form is used in hospital for some serious resistant infections

Common brand names

India: Fosfocin, Uबiotic
Worldwide: Monurol

Common side effects

Diarrhoea
Nausea
Headache
Vaginal itching or discharge

Before taking it — precautions

Mix the granules in water before drinking; do not take dry
Tell your doctor about kidney problems
Tell your doctor if you are pregnant or breastfeeding

When to see a doctor urgently

Fever, back pain or shaking chills, which may mean a kidney infection (urgent)
Severe or bloody diarrhoea
Allergic reaction such as swelling or breathing trouble (urgent)

Not a prescription — no dose shown. The right dose of fosfomycin 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

Is one sachet enough?

For simple cystitis it is often a one-time treatment; symptoms can take a couple of days to settle.

What if my symptoms don't improve?

See your doctor; you may need a urine test and a different antibiotic.

Can men use it?

It is mainly used for simple bladder infections in women; urinary infections in men need a doctor's assessment.

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Sources & further reading

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.