# Doxycycline for Fish (Fish Dox)

> Doxycycline is a tetracycline that stops bacteria from making proteins they need to grow. It has a broad spectrum and is a long-standing favorite for systemic infections. Broad-spectrum, covering many gram-positive and gram-negative bacteria.

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

## Commonly used for

- Internal and systemic bacterial infections
- Dropsy-type conditions caused by bacteria
- Mixed bacterial problems

## Things to know

- Tetracyclines can affect biofilter bacteria, so treat in a hospital tank when possible.
- Not effective against parasites or fungi.
- Keep medicated water out of reach of children and other animals.

## Products

- [Fish Dox 100mg 30-Tablets](https://petremedyusa.com/products/fish-dox-100mg-30-tablets/): from $39.99
- [Fish Dox 100mg 60-Tablets](https://petremedyusa.com/products/fish-dox-100mg-60-tablets/): from $71.99

## Frequently asked questions

### What is doxycycline used for in fish?

It is often chosen for internal bacterial infections and for cases where the exact bacteria are unknown, because of its broad spectrum.