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Thomas Labs Fish Pen Forte 500mg

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Thomas Labs
RRP: $36.99
$31.18 (You save $5.81)
Usually ships within 24 hours!

 Product Description

Thomas Labs Fish Pen Forte™ - 500mg

Fish Pen Forte™ is the trusted antibiotic for fish, combating a number of bacterial diseases common in fish.


  • Highly-effective antibacterial agent

  • Combats a variety of bacterial diseases in fish

  • Ideal for aquarium and ornamental fish only

Fish Pen Forte™ (Penicillin V Potassium) from Thomas Labs is an antibiotic that exerts a bactericidal action on gram-positive and some gram-negative bacteria in fish. This fish antibiotic is useful for control of some common bacterial diseases in fish, including diseases caused by bacteria such as fin and tail rot and Flexibacter infections. Shop My Hooves and Paws today to get your supply of fish antibiotics and aquarium antibiotics to protect your scaled friends from bacterial diseases. Help keep your fish healthy and happy!


  • Penicillin V Potassium 500mg 

  • Not for human consumption

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

  • Made in USA


Add 1 tablet (500 mg) to the aquarium for every 20 gallons of water to be treated. Repeat in 24 hours. It is suggested that a partial water change be made between treatments. While 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.

*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 assist you however we can! 


Fish Pen 500mg 100 Count Expiration Date:6/2021 or Later  

Fish Pen 500mg 30 Count Expiration Date:5/2021 or Later

 Warranty Information

If you are not happy with your purchase, MyHoovesandPaws understands. We accept returns an astonishing 365 days from the date you place your order. For more details please see our returns page.

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 Product Reviews

  1. Fast shipping (to VA), works as intended, great price!

    Posted by James Bennett on Jan 16th 2017

    This was the first time I had ordered grok hooves and paws, and I was very satisfied. The antibiotics got here faster than expected from across the country. They knocked out the infection, and the price was fair. I would definitely buy from them again!

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