# Metronidazole for Fish (Fish Zole)

> Metronidazole targets protozoa and anaerobic bacteria. It is one of the main tools hobbyists use against internal flagellates such as Hexamita and Spironucleus. Protozoan parasites and anaerobic bacteria. It is not a general-purpose antibiotic.

Source: https://petremedyusa.com/medications/metronidazole-for-fish/ · PetRemedyUSA

## Commonly used for

- Internal flagellate infections
- Hole-in-the-head disease in cichlids and discus
- White, stringy waste and appetite loss
- Some cases of bloat

## Things to know

- It does not treat external parasites such as ich or velvet; those need a different approach.
- Medicated food is often used because sick fish may refuse it, so many keepers dose the water.
- Treat in a hospital tank.

## Products

- [Fish Zole 250mg 30-Tablets](https://petremedyusa.com/products/fish-zole-250mg-30-tablets/): from $35.99
- [Fish Zole 250mg 100-Tablets](https://petremedyusa.com/products/fish-zole-250mg-100-tablets/): from $59.99
- [Fish Zole 500mg 100-Tablets](https://petremedyusa.com/products/fish-zole-500mg-100-tablets/): from $87.99
- [Fish Zole 500mg 60-Capsules](https://petremedyusa.com/products/fish-zole-500mg-60-tablets/): from $71.99
- [Fish Zole 250mg 60-Capsules](https://petremedyusa.com/products/fish-zole-250mg-60-tablets/): from $47.99

## Frequently asked questions

### Does metronidazole treat ich?

No. Ich is an external parasite that needs different treatment, such as heat with salt or a copper-based product. Metronidazole targets internal protozoa and anaerobic bacteria.

### What are the signs of internal parasites?

Common signs include white or stringy waste, weight loss despite eating, pale color and, in cichlids or discus, pitting on the head.