🦠microbiology review

Metronidazole

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

Metronidazole is an antibiotic and antiprotozoal medication used to treat various infections caused by anaerobic bacteria and certain protozoa. It is commonly prescribed for conditions like bacterial vaginosis, trichomoniasis, and gastrointestinal infections.

5 Must Know Facts For Your Next Test

  1. Metronidazole targets the DNA of anaerobic microorganisms and protozoa, causing cell death.
  2. It is effective against a variety of pathogens including Bacteroides, Clostridium species, and Giardia lamblia.
  3. Common side effects include nausea, a metallic taste in the mouth, and potential disulfiram-like reactions with alcohol.
  4. Metronidazole is available in oral, topical, and intravenous forms.
  5. It is often used as part of combination therapy for Helicobacter pylori infections.

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