1. Home > 
  2. Floating Products > 
  4. Fish Mox Forte (Amoxicillin) - 500mg (100 capsules)


Fish Mox Forte (Amoxicillin) - 500mg (100 capsules)

Compare to: $50.99

Price too low to show

Add to cart to see low price
and Ships Free!*
You Save: $12.50!(25%)
This item is currently out of stock!


Fish-Mox Forte is a broad-spectrum antibiotic that controls gram-positive and some gram-negative bacteria in fish. It works by halting the multiplication of bacteria associated with both fresh and saltwater ornamental fish diseases. This fish antibiotic is useful for control of some common bacterial diseases in fish including Dropsy, Fin Rot, Red Pest, and diseases caused by bacteria such as Aeromonas, Pseudomonas, and Mycobacterial (Gill diseases and Chondrococcus).

Due to recent high demand of this product, orders may take longer to ship than normal. We are shipping orders as quickly as possible. For a faster ship time, try Fish Aid brand


Active Ingredients: (in each capsule)
Amoxicillin Trihydrate 500 mg

Useful Information

Add 1 capsule (500mg) into aquarium for every 20 gallons of water to be treated. Repeat in 24hours. It is suggested that a partial water change is made between treatments. While the duration of treatment depends on type and severity of infection, it is recommended that extended medication baths continue for a minimum of 5 days but not more than 10 days. Discontinue treatment if no improvement is noted within 5 days. To remove harmless yellow color, change 20% of water and use charcoal filter until clear.

Warnings: For aquarium and ornamental fish only. Not for human use. This product should not be given to fish intended for human consumption. Keep out of the reach of children and animals. In case of accidental overdose, contact a health professional immediately.

Storage: Keep container tightly closed and in a cool, dry place.

Customer Reviews

Review Summary
72 Reviews
93% (67)
6% (4)
1% (1)
0% (0)
0% (0)
100% Recommend this product (72 of 72 responses)
By Magdalena C.
New Jersey
Great for treatment of feral cats !!
January 11, 2021
Treating one of feral cats who was wheezing , breathing heavy and not doing good yesterday. He is about 12-15 lbs (estimate). I Started treatment yesterday with 10 mg/lb (so took about 100mg from 500mg capsule-divided in portions). Mixed with Pill Pocket and covered with smelly quality tuna cat food (Tiki Cat). Today already see improvement-will continue giving him for 5-7 more days. Its sad that for hard to catch feral cats , you can not get meds from vet. This option is awesome!
ProsAvailability, low cost, effective for cats
By Lori
Portland, Oregon
Happy with purchase.
December 10, 2020
Product arrived quickly and well packaged. Used it once for an infection and it worked well. I appreciate that these pills have the stamped registration number which instills more confidence that the list of ingredients are accurate.f
ProsFast delivery, registered and well sealed. Good price.
ConsPopular item that is often out of stock due to demand. Ask to be notified when restocked.
By Trema H.
North Carolina
Great Service
October 19, 2020
Product was in stock and arrived at my house in a timely manner.
By Sheila
Pittsburgh Pa
Not 4 fish
October 1, 2020
I buy this because it is cheaper and easier to have Anti-biotics on hand for when i get sick
By Patricia
Fish Mox
September 28, 2020
I have a very large fish tank and up until now haven’t had any problems with it. Then all of a sudden a couple of my fish got sick. I was told that they needed antibiotics. After giving them fish mox for several days the problem cleared up. Thank you, Entirely Pets for your prompt service.
By PetParent1214
Thomas Labs products are always excellent & EP has decent prices, great shipping
September 20, 2020
You can't go wrong. Quality product, decent price, fast, free shipping! It's a simple fix for what can end up being a deadly problem in your tanks.
By Pammypanda
Yorkville Ga.
Keep on hand
September 14, 2020
This works great. Having it on hand is essential.
Purchase before you need it and don’t wait until you need it. 🤗
Merchant Response:Truer words were never spoken, Pammypanda.
ProsFast acting
By Amy
Lillian, AL
It Works
March 28, 2020
This product is great. It works and is just as good as any prescribed medication for the specific infections intended for.
I will continue to buy these products any time they are needed.
I do recommend
By M M.
December 30, 2019
Exactly what we needed and at the right price. Many thanks.
Houston Tx
Save my Fish life!
April 11, 2019
If it was not for the Fish mox, I would have a dead fish already!
By Bigrshel
Washington st
Great products
May 19, 2018
Love the products and prices & quick shipping thx .......
By Lisa C.
Awesome quality
May 14, 2018
I'm a repeat buyer and recommended this product fully.
By Kagigi
Works as advertised
April 24, 2018
Fast shipping easy ordering will return for more as needed
By Mike H.
April 9, 2018
Worked good on sick fish. Great shipping. Good company!!
By krey603
fish mox
August 11, 2017
my fish have never looked better. I tried another company's product before but it was not very effective.
Thank you Entirely Pets. The order process was easy and the response awesome. I will be back for other products soon.
By Hello t.
Amazing Product
August 3, 2017
Entirely is so easy to order from.
Simple steps to follow on their website.
Fast delivery.
Thank you Entirely
By Tc
June 12, 2017
Use it for sick stray rescue cats as well as for my fish, works great!
By Lynda
Fish mix forte
April 7, 2017
#1. entirely pets always gets whatever I order to me within a day or two. Number 2 this product helped my dog get over whatever she had going on in her sinuses and nose. It had been three months of trying everything besides a vet visit which I can't afford. She is so much better now with only another week or so of the amoxicillin. Thank you!
By Curdog
West Virginia
March 14, 2017
Fast service ,delivered on time, Just what i needed to solve a infection from a wound.
By sam
tucson, AZ
fish mox
February 3, 2017
actually used to to clear up an infection in my dogs mouth. extremely impressed in how quickly it worked. will use this product again, if needed
By CowboysAllDayErryday
No complaints only praises!
January 19, 2017
Pet had infection and this product never lets me down! Easy ordering, quick shipments and a quality product!
By PDoc354
Cumbris. United Kingdom.
Simply the best.
January 5, 2017
First class goods and service, especially to the UK. Very pleased and will certainly come back. Will also recommend to my friends. Thanks very much.
By Wolf
Killeen, TX
Fish Mox Forte
October 31, 2015
Keeps all my fish happy and healthy. Easy to use.
By tony
best product ever
May 12, 2015
SUPER !!!!!!!!!!!!!!!!! SUPER!!! SUPER!!!! SUPER!!!!!!!
By Zuma D.
Malibu, CA
A must have for my house
March 24, 2015
Great product to keep around just in case,
the 500mg are perfect
By bo
Great online retailer
February 1, 2015
Great product, super fast shipping. Couldn"t be more pleased. 4****
By Annie
Perfect for cat URI's
January 14, 2015
My kitten, Frankie, came to me with a cat cold last month. With round the clock care it cleared up on its own except for a lingering sneeze that started to get progressively worse.
I am on a fixed income and could not afford to take her to the vet until the middle of the month. Having grown on a farm in the past, I have experience in treating animals of all sorts.
This antibiotic is a staple.
Started treatment for feline URI at the beginning of January and it has now cleared up.
No sneezing and gaining weight rapidly.
Kitten received .25 ml x2 daily mixed in with homemade chicken broth. If your pet is sick, it's good to keep them on a very bland diet. Boil chicken breasts and white rice, use the broth to mix with the rice. Smells great to them and is good on their digestive system while being treated with antibiotics.
Kittens under two pounds - .25 ml
Over 5 pounds - .5 ml
Over 10 pounds - 1.0 ml

Perfect antibiotic for treatment of feral cats as well.
Keep this antibiotic on hand at all times if you own pets.
By leehampton
Great company
September 26, 2014
I love ordering from Entirely Pets, first rate service, great products!
By Sissy
September 10, 2014
Excellent product. Great service. Thank you.
By Carolann
great purchase
August 28, 2014
I truly like the fish mox, we have 3 fish tanks, and use for healthy fish.

Questions and Answers

2 Questions & 6 Answers
pat bollinger
from indpls asked:
August 10, 2019

can I use fish mox on cats there ferel cats and for what.

1 Answer
Hello Pat, No your can't use these on cats or kittens. These are mean for fish only.
Submitted by: Customer Service on August 14, 2019

October 8, 2018
I was wondering if these antibiotics are food grade.
5 Answers
I certainly hope so :-) Seriously, I've used them before getting dental work for years.
Submitted by: Mimi on October 12, 2018 from CT
Submitted by: TSampley on October 16, 2018 from Denver
 I believe so. They have the same markings and coloring’s as the ones my doctor prescribes when I get sick. They look identical to the ones the pharmacy gives me. 
Submitted by: Lorena on October 16, 2018 from Cypress Ca
Absolutely yes
Submitted by: Earthangel on February 17, 2019 from Boston MA
Hi dode, Fish are given many of the same antibiotics as humans—amoxicillin, ciprofloxacin, penicillin and more—sometimes even in the same doses. These pills, which are intended to be dissolved in fish tanks and be absorbed through fishes' skin, can also look extremely similar to the human versions.
Submitted by: EntirelyPets on May 7, 2019

CALL IN YOUR ORDER 800.889.8967