My vet prescribed Metrogyl / Flagyl / Metronidazole.   What does that mean?

Metronidazole is an antibiotic and antiprotozoal drug, sold in Australia under the brand names Metrogyl and Flagyl, as well as under the drug name Metronidazole.  The different brands offer the same active ingredient in different strengths and different delivery methods (tablet, suspension, paste etc) and you should check with your vet if you intend to change between the brands.