Choose your concern
Explore the condition guides and available assessment options.
Care365 medication guide
Fosfomycin
Treats selected uncomplicated bladder infections in adult women; not kidney infection.
Drug information
Uses, directions and safety information for Fosfomycin.
What it is used for
Treats selected uncomplicated bladder infections in adult women; not kidney infection.
How to use it
Dissolve one 3 g sachet in about half a cup of cold water and drink immediately. Do not repeat daily without reassessment.
Before use
Check allergy, sulphite sensitivity and severe kidney impairment.
Possible side effects
Diarrhoea, nausea and vaginal irritation.
When to get medical help
Fever, flank pain, persistent symptoms, allergic swelling or severe diarrhoea need assessment.
Medicines and interactions
Metoclopramide can reduce exposure; review probenecid and other medicines.
Pregnancy and breastfeeding
Pregnancy or breastfeeding requires individual advice; the referenced product is for adults.
Missed doses, storage and accidental exposure
Follow your own product’s missed-dose instructions. If you are unsure, ask a pharmacist before taking an extra dose. Contraceptives, injections and modified-release medicines may need a specific plan.
Keep the original packaging and follow its storage, expiry and disposal instructions. Keep medicines away from children and pets. Ask about refrigeration, after-opening limits and safe sharps disposal when relevant.
For suspected overdose or accidental swallowing, contact poison control or urgent medical care promptly. Call emergency services for breathing difficulty, collapse or a seizure.
Care that starts with a conversation
How Care365 can help
Explore care for your symptoms and prepare for a conversation about treatment. Your healthcare professional will consider your history, current medicines and whether an assessment or referral is appropriate.
Your next steps
Know what to prepare and what to discuss.
Share your history
Prepare your symptoms, allergies, medication list and treatment questions.
Discuss your options
A healthcare professional assesses which care or referral is appropriate.
Plan your follow-up
Follow the advice you receive about treatment, monitoring and next steps.
Related condition guides
Learn about concerns where this medication may be discussed. Treatment depends on your individual assessment.
Prescription renewal and medication review
For a review of Fosfomycin, have your current dose, reason for treatment, remaining supply, benefits, side effects and pharmacy details ready. Ask your pharmacist or prescriber whether a renewal assessment is available and appropriate. A prescription or renewal is not guaranteed.
Questions about Fosfomycin
What is Fosfomycin used for?
Treats selected uncomplicated bladder infections in adult women; not kidney infection.
How should I use Fosfomycin?
Dissolve one 3 g sachet in about half a cup of cold water and drink immediately. Do not repeat daily without reassessment.
What side effects can Fosfomycin cause?
Diarrhoea, nausea and vaginal irritation.
When should I get medical help while using Fosfomycin?
Fever, flank pain, persistent symptoms, allergic swelling or severe diarrhoea need assessment.
Can Fosfomycin interact with other medicines?
Metoclopramide can reduce exposure; review probenecid and other medicines.
What should I know about Fosfomycin during pregnancy or breastfeeding?
Pregnancy or breastfeeding requires individual advice; the referenced product is for adults.
Sources and product information
Sources checked 2026-09-08. Safety sections are highlights; consult the full product information for complete warnings and instructions.
Check the Canadian Drug Product Database by product name or DIN for current product information.
← Browse all medication guides