Fritz Aquatics

Expel Deworming Fish Treatment

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Expel-P is a levamisole HCL-based medication that is effective in safely and effectively deworming ornamental fish. Expel-P also acts as an immunostimulant agent. Expel-P is very safe and is effective against many internal parasites, especially nematodes, when used as directed. It won’t harm the bio-filter, or other non-worm invertebrates or uninfected fish. As an added benefit, it boosts the immune response of fish. It is effective against Nematodes, Roundworms, Nodular Worms, and Hookworms. Expel-P also works as a coral dip to treat for flatworms and pest nudibranchs. Expel-P does not treat Cestodes (tapeworms) or Trematodes (flukes).



  • Provides Fast Relief
  • Won’t discolor the water
  • Safe and gentle for most fish


Disease treatment in a quarantine tank is always recommended when possible. Expel-P contains levamisole HCL, which is not safe for use in the presence of ornamental worms (Featherduster worms, etc). Always observe tank inhabitants carefully when treating, and be prepared to perform a water change and add fresh activated carbon if necessary.


Available in Two Sizes

  • 10 count
  • 20 count


Active Ingredients: 113 mg levamisole hydrochloride per packet



Use of a hospital tank is recommended. No water changes, pH or temperature adjustments necessary if readings are in ideal range. Remove all chemical filtration (carbon, ion exchange resins) before and during use. UV Sterilizers, if present, must be turned off during treatment. Aeration and water flow should be maintained. In marine aquariums, turn off protein skimmer during treatment; resume use after completion of treatment. The active in Expel-P is light sensitive and works best with aquarium lights turned off during treatment. Expel-P is stable in water for up to90 days and will do its job in aquaria at any pH.

Fish Treatment

  • Use 1 packet Expel-P per 10 gallons of water. 
  • Perform a 25% water change, taking care to remove excreted worms/parasites after 24 hours. 
  • Repeat the cycle one additional time one week later to prevent reinfection. 
  • Repeat weekly treatments as necessary.


Coral Dip

  • Use three packets Expel-P per two gallons of salt water. 
  • Place affected corals into dip for up to 30 minutes with adequate water flow to assist in worm removal. 
  • Once worms stop falling off, the coral can be returned to display or quarantine tank. 
  • Treatment does not affect eggs. Treatment can be repeated once per week, up to three times.


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SKU Expel Deworming Fish Treatment - Fritz Aquatics
Out of stock message DISCONTINUED
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Product Questions

Im trying to find the best medication for Black ick treatment and cant seem to find any good medication to treat for it will this work for it and if not what will.
Question by: Jordan Wise on Sep 2, 2022, 5:56 AM
Hey there,
Thank you for reaching out to us. This would not be great for Black Ick, you best option is Prazipro, or formalin bath.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Sep 9, 2022, 9:21 AM