Fish & Bird Antibiotics
Antibiotics treat bacterial infections such as fin rot, ulcers, columnaris and dropsy. They do not treat parasites or fungus. Browse by active ingredient below, or read our antibiotic comparison guide to match a class to a problem.
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Amoxicillin (Fish Mox) · guide
Amoxicillin/Clavulanate (Fish Clav) · guide
Cephalexin (Fish Ceph) · guide
Ciprofloxacin (Fish Flox) · guide
Levofloxacin (Fish Levo) · guide
Doxycycline (Fish Dox) · guide
Minocycline (Fish Mino) · guide
Sulfamethoxazole/Trimethoprim (Fish Sulfa) · guide
Penicillin (Fish Penicillin) · guide
Clindamycin (Fish Clin) · guide
Erythromycin (Fish Erythro) · guide
Azithromycin (Bird Zithro) · guide
Other treatments
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How to choose an antibiotic
Start with the type of problem. Penicillin-class drugs and cephalosporins are commonly used for fin rot, wounds and skin infections that involve gram-positive bacteria. Fluoroquinolones are chosen for fast-moving gram-negative infections such as columnaris. Tetracyclines and sulfa combinations offer broad coverage for internal or unclear infections. If the first choice does not help within the timeframe on the label, keepers usually switch to a different class rather than repeating the same one.
Before you treat
- Set up a hospital tank to protect your main filter.
- Test ammonia and nitrite daily and keep them at zero.
- Remove activated carbon, which absorbs medication.
- Read the label and complete the full course.
Antibiotics FAQ
Do antibiotics work on parasites?
No. Antibiotics only act on bacteria. Parasites such as ich need a parasite-specific treatment.
Can I use these antibiotics on people?
No. They are labeled for ornamental aquarium fish (or birds where stated) and are not for human use.
Which antibiotic should I start with?
It depends on the problem and species. Our antibiotic comparison guide explains each class, and a veterinarian can advise for valuable fish.