Doxycycline for Fish (Fish Dox)
Quick answerDoxycycline 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.
What doxycycline is 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.
How it compares with other options
Doxycycline is one of several classes of antibiotic used by keepers. Our comparison guide lays out which class suits which problem, and our treatment packs combine complementary classes so you have a backup ready.
Products containing doxycycline
Doxycycline FAQ
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.
Responsible use. For ornamental aquarium fish only. Not for human use or fish intended for food. Follow the label and consult a veterinarian when unsure.