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  • Fritz Aquatics Fritz Expel-P Parasite Medication

Fritz Expel-P Parasite Medication

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Parasite medication for freshwater and saltwater aquariums.

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Expel-P (Levamisole HCl), is an anthelmintic (anti-worm) and immunostimulant agent. Expel-P is safe to use in freshwater and saltwater aquaria and is effective against many internal parasites, especially nematodes when used as directed. It does not harm the bio-filter, plants, other invertebrates, or uninfected fish. As an added benefit, it boosts the immune competence of fish. It is effective against Nematodes, Roundworms, Nodular Worms, and Hookworms. Can be used as a coral dip to treat flatworms and pest nudibranchs. Expel-P does not treat Cestodes (tapeworms) or Trematodes (flukes).



Use of a hospital tank is recommended. No water changes, pH, or temperature adjustments necessary if readings are in the ideal range (Freshwater pH 6.4 - 7.6 / Saltwater 8.0- 8.4, temperature 68̊ to 86̊F). 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.

Note: Fritz Expel-P will not color or cloud aquarium water.


Directions: Use 1 packet Expel-P per 10 gallons of water. Perform a 25% water change taking is 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 Directions: Use three packets Expel-P per two gallons of saltwater. Place affected corals into a 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 a display or quarantine tank. Treatment does not affect eggs. Treatment can be repeated once per week, up to three times.


Ingredients: Each packet contains 113mg levamisole hydrochloride.

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