# Erythromycin for Fish (Fish Erythro)

> Erythromycin is a macrolide antibiotic that stops bacteria from making proteins. It is available as a powder packet that dissolves quickly in water. Primarily gram-positive bacteria.

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

## Commonly used for

- Mild external bacterial infections
- Gram-positive skin and fin problems

## Things to know

- Single-use packets make measuring simple.
- Not effective against parasites or fungi.
- Treat in a hospital tank where possible.

## Products

- [Fish Erythro Powder 10-Pack](https://petremedyusa.com/products/fish-erythro-powder-10-pack/): from $31.99

## Frequently asked questions

### Why is Fish Erythro sold in packets?

Each packet is a measured dose, which removes guesswork and dissolves readily in aquarium water.