Thomas Labs Fish Zole Metronidazole Antibacterial Fish Medication, 100 count

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Deliver bacteria-busting medicine to your fish with ThomasLabs’ Fish Zole Metronidazole Antibacterial Fish Medication! This dissolving tablet contains Metronidazole, an antibiotic designed to combat parasitic and bacterial infections common in fish. Bactericidal action works to control gram-positive and many gram-negative bacteria that can plague your fishy friends. Put an end to pesky diseases brought on by bacteria such as Pseudomonas, Mycobacteria and Aeromonas. Plus, Metronidazole is extremely effective against anaerobic bacteria, making it the perfect antibacterial for fish!

Key Benefits
  • Cures many common fish ailments including Gill diseases and diseases caused by parasites.
  • Halts the multiplication of bacteria typically found in common fish diseases.
  • Effective against many organisms including all gram-positive and most gram-negative bacteria.
  • Easily dissolves in water, creating a medicinal bath that can be used for up to 10 days.
  • This unique formula is developed to work on both saltwater and freshwater fish.

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.

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  • Item Number
  • Aquarium Type

    Freshwater, Saltwater

  • Product Form



Metronidazole 250 mg.


Add 1 tablet (250 mg) into aquarium for every 10 gallons of water. 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. To remove harmless yellow color, change 20% of water and use charcoal filter until clear.

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

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  • It worked!

    By on

    This drug did what i needed, for what it was needed for here! So grateful that chewy carries this even if I used it for a different animal! It is the same drug my vet sells at 500mg tablets for the same thing I used it for and my animals had no ill effects at all! So i so saved a vet and medication bill of well over 100 dollars I am sure! Hugs from the old wolf to everyone!

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  • Perfect item and shipping

    By on

    This was exactly what I wanted and it arrived in record time

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  • Good Medicine

    By on

    Works great just as it should. Would recommend to anyone

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  • Quick dissolving

    By on

    Dissolved quickly and worked - gills are much better looking

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  • Anti-Fungal Med

    By on

    We used this for a fungal infection called Trichomoniasis. It got rid of the infection. Everyone is healthier and happier.

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