Metronidazole 500mg
Generic For: Flagyl
Metronidazole 500mg (brand name Flagyl) is a prescription nitroimidazole antibiotic used to treat trichomoniasis, amebiasis, and serious infections caused by anaerobic bacteria. It is sometimes prescribed alongside other antibiotics, such as amoxicillin, when a provider determines combination therapy is appropriate. After review of your prescription by a licensed provider, your order ships from a licensed U.S. pharmacy.
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Buy Metronidazole 500mg (Flagyl) Online
A nitroimidazole antibiotic for trichomoniasis, amebiasis, and anaerobic bacterial infections
Metronidazole 500mg Quick Facts
| Drug class | Nitroimidazole antibiotic |
|---|---|
| Treats | Trichomoniasis, amebiasis, anaerobic bacterial infections |
| Form | Tablet |
| Typical dosing | Take 1 tablet by mouth twice daily for 10 days. Do not drink alcohol while taking this medication. |
| Prescription required | Yes — prescription only |
What Is Metronidazole 500mg?
Metronidazole is a nitroimidazole antibiotic sold under the brand name Flagyl. It works by disrupting the DNA of susceptible bacteria and parasites, stopping the infection from spreading. It is FDA-approved to treat trichomoniasis, intestinal and liver amebiasis, and a range of serious anaerobic bacterial infections. Because it targets different organisms than penicillin-class drugs, providers sometimes prescribe metronidazole together with amoxicillin for certain infections, such as dental abscesses.
What Does Metronidazole 500mg Treat?
Trichomoniasis (in patients and their partners)
Intestinal amebiasis (amebic dysentery)
Amebic liver abscess
Intra-abdominal anaerobic bacterial infections
Skin and skin structure anaerobic infections
Gynecologic anaerobic infections
Anaerobic bone, joint, CNS, and lower respiratory infections
Metronidazole 500mg Dosage
Trichomoniasis: 2 g by mouth as a single dose, or 500 mg by mouth twice daily for 7 days
Amebiasis: 750 mg by mouth three times daily for 5–10 days
Anaerobic infections: 7.5 mg/kg by mouth every 6 hours (usual adult dose 500 mg), not to exceed 4 g/day, for 7–10 days
Your prescriber will determine the dose and duration that are right for you. Always follow the directions on your prescription label.
Metronidazole 500mg Side Effects
Common side effects
- Nausea
- Headache
- Metallic taste in the mouth
- Loss of appetite
- Diarrhea
- Dizziness
- Abdominal cramping
- Dark-colored urine
Serious side effects
Stop taking this medication and seek medical attention right away if you experience:
- Seizures
- Numbness or tingling in hands or feet (peripheral neuropathy)
- Severe allergic reaction (rash, swelling, difficulty breathing)
- Encephalopathy (confusion, trouble speaking, coordination problems)
- Aseptic meningitis (severe headache, stiff neck, fever)
- Severe skin reactions (blistering, peeling)
Warnings & Interactions
Boxed warning: metronidazole was carcinogenic in animal studies; use only for approved indications
Do not drink alcohol during treatment and for at least 3 days after the last dose
Contraindicated with disulfiram use within the past 2 weeks
Contraindicated in the first trimester of pregnancy for trichomoniasis
May increase the effects of warfarin and other blood thinners
Stop and seek care if neurologic symptoms (numbness, seizures, confusion) develop
Use with caution in severe liver disease; contraindicated in Cockayne syndrome
Tell your prescriber about all medications, supplements, and health conditions before starting metronidazole 500mg.
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