Flagyl Dosage: What You Need to Know About Metronidazole Dosing

When you’re prescribed Flagyl, the brand name for the antibiotic metronidazole, used to treat bacterial and parasitic infections. Also known as metronidazole, it’s one of the most common drugs for infections like bacterial vaginosis, trichomoniasis, and C. diff diarrhea. But getting the Flagyl dosage right matters—too little won’t kill the infection, too much can cause serious side effects like nerve damage or nausea so bad you quit taking it.

Most adults take 500 mg twice a day for 7 to 10 days for bacterial infections, but that changes fast depending on what you’re treating. For trichomoniasis, a single 2-gram dose often works. For C. diff, it’s usually 500 mg three times a day for 10 days. Kids get doses based on weight—around 15 mg per kg per day, split into three doses. If you have liver problems, your doctor will lower the dose because Flagyl stays in your system longer. And if you’re on other meds like warfarin or lithium, your dosage might need tweaking—Flagyl can mess with how your body processes them.

It’s not just about the number of milligrams. Timing matters too. Take Flagyl with food to avoid stomach upset, but skip alcohol completely—seriously, even a sip can trigger vomiting, flushing, and a racing heart. The drug sticks around in your system for days after your last pill, so wait at least 3 days after finishing before drinking. Some people get a metallic taste or numbness in hands and feet—these are early signs of nerve issues, and you should call your doctor if they happen.

What you’ll find below is a collection of real-world posts that dig into how Flagyl is used, what it’s paired with, and how it stacks up against other antibiotics. You’ll see how it’s being studied for tuberculosis, how it compares to other gut infection treatments, and what patients actually experience when taking it. No fluff. No guesswork. Just clear, practical info from people who’ve been there.