If your doctor mentioned fosfomycin, you’re probably dealing with a urinary tract infection (UTI) or another bacterial problem. Fosfomycin is a single‑dose antibiotic that works differently from many other pills, so it’s good to know the basics before you start.
Most doctors prescribe fosfomycin for uncomplicated UTIs, especially in women. It’s also used for some resistant infections when other antibiotics fail. If you have a kidney stone, a complicated infection, or are pregnant, your doctor might choose a different drug.
The typical dose is a one‑time 3‑gram tablet taken with a full glass of water. You don’t need to split the dose or take it for several days, which makes it convenient for busy schedules.
Before you swallow the pill, make sure you’re not allergic to penicillins or other antibiotics. Allergic reactions to fosfomycin are rare, but they can happen. Let your doctor know about any past drug reactions.
Even though fosfomycin is usually well tolerated, you might notice a few mild side effects. The most common are stomach upset, diarrhea, or a slight headache. These usually fade within a day or two.
If you develop a rash, itching, or feel short of breath, stop the medication and call your doctor right away—these could be signs of a serious allergic reaction.
Because fosfomycin stays in your system for a while, avoid taking any other antibiotics at the same time unless your doctor says it’s okay. Mixing drugs can reduce the effectiveness of both.
Stay hydrated and keep drinking water after the dose. This helps the drug work better and flushes bacteria out of your urinary tract.
Do not use fosfomycin if you have severe kidney problems without a doctor’s clearance. The drug is cleared by the kidneys, and impaired function can cause it to build up in your body.
When the prescription is filled, double‑check the tablet strength (usually 3 g). Some pharmacies stock a 1‑gram version for different uses, but for a standard UTI you need the 3‑gram dose.
If symptoms linger after 48‑72 hours, or if you develop a fever, contact your healthcare provider. You might need a different antibiotic or a longer treatment plan.
Remember, finishing the prescribed dose is essential even if you feel better quickly. Skipping the dose can let the infection return and may cause resistance.
In summary, fosfomycin is a quick, single‑dose option for many uncomplicated UTIs. Follow the dosage instructions, stay hydrated, watch for side effects, and keep your doctor in the loop if anything feels off.
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