API E.M. Erythromycin Freshwater Fish Bacterial Disease Medication

Rated 4.3846 out of 5 stars


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$273.78 (-11%)Chewy Price
$307.98Chewy Price
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About This Item


  • .Broad spectrum powder helps treat and control bacterial diseases including bacterial gill disease, body slime, furunculosis, hemorrhagic septicemia and mouth fungus.
  • Protects your finned friend from secondary bacterial infections when used with API ich, fungus or parasite treatments.
  • Convenient 1.87-pound box includes measuring scoop for use in any size tank.
  • Safe for use in freshwater and saltwater aquariums.
  • Does not discolor aquarium water.

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Frequently Bought Together

API Freshwater Aquarium Salt, 16-oz carton
Rated 4.8033 out of 5 stars
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Total Price: $444.50

Questions & Answers

43 Customer Questions

Is this product safe for plants and snails?
Answer by ChewySep 02, 2018
This product is safe for invertebrates and plants.

Does this product help treat popeye in betta fish?
Answer by ChewyJul 20, 2018
If you catch the popeye early enough, you can use erythromycin.

can I use API General Cure API Super Ick Cure and API E.M. Erythromycin at the same time?
Answer by ChewyFeb 07, 2019
Any of the API medications can be used in conjunction with each other.

Good morning, I have a few questions about your amoxicillin. Is it ok to use as a preventative? I had a fish die from red blotch. A Cory catfish. A bacteria is contagious I think? My other corys look ok but can I treat them just in case?
Answer by ChewyMar 14, 2018
This product can also help prevent a secondary bacterial infection when used with any API Super Ick Cure.

ReviewsWrite a Review

Rated 4.3846 out of 5 stars
39 Ratings
Would recommend to a friend

39 Customer Reviews

Rated 5 out of 5 stars
By Justine on Nov 8, 2023

Did it's job

I buy this for my son, he needs to for the fish.

Rated 5 out of 5 stars
By Tina on Apr 17, 2022


Exactly what I needed Was hard to find but you had what I was looking for Ver TV satisfied

Rated 5 out of 5 stars
By MedKat on Feb 15, 2022

Fast delivery

Received delivery in 2 days. Fish are feeling much better. Thanks Chewy!

Rated 5 out of 5 stars
By customer on Sep 14, 2021

Healthy pets

Follow the directions. This medicine has been around for a long time and works. It saved me hundreds of dollars worth of fish from an outbreak of fungus mouth which can become something worse if left unchecked. Thanks Chewy for shipping so fast, it worked well and I have a healthy aquarium once again!

Rated 5 out of 5 stars
By Emmett on Aug 31, 2021

Super helpful for fin rot!

My Nemo's tail was ragged; this and API Stress Coat+ and water changes helped so much! Follow the directions and fin rot will be gone in no time. It's snail safe, too!

Rated 5 out of 5 stars
By OverbookedVet on Sep 16, 2021

Best Recommendation

In lieu of getting into overbooked vet, used this for my dog's ear infection in combination with ear powder and wipes and hes back to 100%.

Rated 4 out of 5 stars
By SealbeachComber on May 21, 2021

Took care of Cyanobacteria

Couldn't find this locally. Shipping was a little slow. But it worked. I followed the instructions to the letter (had to read them three times because the wording is awkward) and the nasty emerald green stuff is gone. Before I started, and with each water change, I used a bare syphon tubing end to vacuum up as much as the stuff as I could.

Rated 5 out of 5 stars
By Jules on Aug 24, 2021

Great product for fin rot

Bettas are prone to fin rot. I’ve used several products but this seems to work best.

Rated 5 out of 5 stars