 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST] , flu). Using any antibiotic when it is not needed can cause it to not work for future infections.Fosfomycin should not be used to treat infections outside the bladder (such as kidney infections). How to use Fosfomycin Tromethamine 3 Gram Oral Packet Phosphonic Acid, Antibacterials Read the Patient Information Leaflet if available from your pharmacist before you start taking fosfomycin. If you have any questions, ask your doctor or pharmacist. Take this medication by mouth as directed by your doctor, usually 1 packet (sachet) as a single dose. Mix this drug with water before taking it. Pour the contents of 1 packet (sachet) into a half glass (4 ounces or 120 milliliters) of cold water and stir to dissolve. Do not use warm or hot water. Drink all of the mixture right away. Your symptoms should get better within 2 to 3 days. Tell your doctor if you do not get better after 3 days or if you get worse.The side effects of Fosfomycin Tromethamine Oral: Diarrhea, nausea, headache, vaginal discomfort, or dizziness may occur. If any of these effects last or get worse, </s>