Fosfomycin: What It Is and When to Use It

If you’ve been prescribed a single‑dose pill called fosfomycin, you’re probably dealing with an uncomplicated urinary tract infection (UTI). This antibiotic works by stopping bacteria from building their cell walls, which kills the germs fast. Doctors like it because one dose can clear many common UTIs without a long course of pills.

Fosfomycin isn’t just for UTIs; in some countries it’s also used for respiratory infections and certain skin problems when other drugs don’t work. But on our site you’ll mostly see it linked to bladder‑related issues because that’s where most patients ask questions.

How to Take Fosfomycin Correctly

The standard adult dose is one 3‑gram tablet taken with a full glass of water, preferably on an empty stomach. That means waiting at least two hours after eating or drinking anything other than water. If you miss the timing, just take it as soon as you remember – don’t double up.

Kids under six usually aren’t given fosfomycin, and for older children the dose is based on weight. Always follow your doctor’s exact instructions; changing the amount can reduce effectiveness or increase side effects.

Common Side Effects and When to Call a Doctor

Most people tolerate fosfomycin well. The most frequent complaints are mild stomach upset, diarrhea, or a temporary change in taste. These usually go away on their own within a day or two.

If you notice severe vomiting, rash, swelling of the face or throat, or a fever that doesn’t drop after 48 hours, seek medical help right away. Those could be signs of an allergic reaction or a more serious infection that needs different treatment.

Because fosfomycin stays in your system longer than many other antibiotics, it’s less likely to cause resistance when used correctly. Still, don’t use leftover pills for future infections – they may not work and can promote resistance.

Buying Fosfomycin Safely Online

When you look for fosfomycin online, make sure the pharmacy requires a valid prescription. Legit sites will ask for your doctor’s note and verify it before shipping. Avoid any store that sells the drug without asking for a prescription; those are often counterfeit.

Check reviews for price transparency and delivery times. A reputable pharmacy will list the exact dosage, expiration date, and provide a contact number for questions. If something feels off – vague policies or unusually low prices – it’s better to walk away.

Keep your prescription handy when you order, and store the medication in a cool, dry place once it arrives. Following these steps helps you get the right drug without risking safety.