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Thomas Labs Fish Flex 250mg

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Thomas Labs
RRP: $35.99
$29.89 (You save $6.10)

 Product Description

Thomas Labs Fish Flex® (Cephalexin Monohydrate) 250mg

Fish Flex® (Cephalexin Monohydrate) is recognized as a trusted antibacterial fish medication that combats bacterial diseases in freshwater and saltwater fish.   


  • Exerts a bactericidal action on gram-positive and some gram-negative bacteria

  • Does not require a vet’s prescription for purchase

  • Broad-spectrum fish antibiotic

  • Effective against a number of pathogenic bacteria

  • For use in saltwater and freshwater ornamental fish diseases 

Thomas Labs Fish Flex®cephalexin monohydrate is a leading fish antibiotic. This is a generic form of Keflex, is a broad-spectrum antibiotic used to treat a wide range of non-specific bacterial infections during the most active and multiplying stages of infection. This safe, effective fish antibiotic from Thomas Labs is effective against a number of pathogenic bacteria associated with ornamental fish diseases. Order fish antibiotics, fish supplies, and more with My Hooves and Paws to keep your fishy friends healthy and happy!


  • 250mg capsules of cephalexin monohydrate for fish - 100 capsules/bottle, 250mg/capsule

  • For marine and freshwater fish


Add the contents of one Fish Flex capsule (250mg) into aquarium for each 10 gallons of water to be treated Repeat in 24 hours. It is suggested that a partial water change be made between treatments. While treatment duration depends on type and severity of the infection, it is recommended that extended medication baths continue for a minimum of 5 days and not more than 10 days. Discontinue treatment with this medication if no improvement is noted within 5 days. To remove harmless yellow color, change 20 percent of water and use charcoal filter until clear.

 *All Thomas Labs products qualify for free standard United States shipping — regardless of the quantity, no matter how much you buy. It will appear in your cart after you enter your information at checkout.

 Need assistance with your order? Call us at 760-247-5523 or email us at info@myhoovesandpaws.com. We’re happy to help you with your order or answer any questions you may have! 


Fish Flex 250mg 100 Count Expiration Date:12/2020 or Later  

Fish Flex 250mg 30 Count Expiration Date:12/2020 or Later  

Fish Flex 250mg 12 Count Expiration Date:1/2020 or Later     

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 Product Reviews

  1. Great service and product.

    Posted by JWL - Dallas on Feb 21st 2017

    Good fresh product. Excellent fast service and shipping by Hooves & Paws.

  2. Great customer service

    Posted by Barb on Dec 19th 2016

    Thanks,myhoovesandpaws,for great customer service and offering fish flex,a great product to have on hand,

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