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Thomas Labs Fish Pen 250mg

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Thomas Labs
RRP: $36.99
$29.85 (You save $7.14)

 Product Description

Thomas Labs Fish Pen™ - 250mg - 100 Count

Fish Pen™ is the trusted fish antibiotic, 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

Thomas Labs Fish Pen™ (Penicillin V Potassium) is a powerful and effective fish antibiotic that exerts a bactericidal action on gram-positive and some gram-negative bacteria in fish. This fish medication 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 Pen and other fish supplies and aquarium antibiotics to protect your scaled friends from bacterial diseases. Help keep your fish healthy and happy!


  • Penicillin V Potassium 250mg - 100 tablets, 250 mg each tablet

  • Not for human consumption

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

  • Made in USA

  • Expires 11/2019 or Later


Add 1 tablet (250 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! 


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