Other Resources
Outbound Links

Praziquantel for Flukes
This image shows an unborn fluke inside it's "mother"

Praziquantel for Flukes
Written by Dr Erik Johnson

Praziquantel - (branded Droncit)

What it is: Praziquantel is a bitter tasting powder which shows good absorption directly from the treated water, and then admirable clearance of various surface and internal flukes (trematodes) and internal worms in fish.

What it's good at: Because it's gentle, Praziquantel is, and always has been, the "treatment of choice" for Flukes (trematodes) in fish. Praziquantel does not require water changes, praziquantel is harmless to fish of *all* species including Discus, Koi and goldfish fry, and is non toxic to plants, and; (unlike Formalin), praziquantel has no negative filter impact.

Background: Praziquantel has been known to the hobby for many years. The drug is simply put in the water and within just a few hours the infected fish shed the adult parasites from their intestines. Long tapeworms are sometimes found on the bottom of the treatment tank. It was determined also that the
Praziquantel was effective at killing and stopping Fluke (monogenetic trematode) infections. Repeat dosing is usually recommended but this concept should be verified. It is entirely conceivable that the flukes can be eradicated with only one treatment. Minimum treatment levels also should be reviewed and tested.

Praziquantel was traditionally available in the form of branded Droncit tablets, for oral administration in dogs and cats. The average retail (vet) price was something on the order of four dollars per tablet which only contained thirty four milligrams.
Considering the proper dosing of praziquantel, the cost of treating a thousand gallons of water would normally be $908.23

Even with Biltricide, the cost of praziquantel is daunting.

Lately, the drug has become available such that it can be deployed for about $20 per thousand gallons to be treated.

The recommended dose of Praziquantel is 2 milligrams per liter of water. This means that in 100 gallons of pond water you would need about seven hundred milli-grams. In a thousand gallons you would need about seven grams of Praziquantel.

The drug is simply stirred vigorously into a liter of clean water and, when mostly dissolved, the white colored suspension is deposited into a high-flow area of the pond. If the fish ingest some of the medicine as it settles out, it's not a problem. Discontinue carbon and UV during treatment to avoid inactivation of the Praziquantel. You do not need to bypass the filter nor worry about oxygen levels during treatment. The most successful treatments are deployed in cleaner ponds, so any
excess leaf litter or debris should be removed. Clearance of the flukes can be determined by microscopy or the overall improvement of signs of flashing and scratching. On occasion, segmnents or ribbons of worms may be passed in the fish stools and are generally of no concern to human health. No sifde effects as far as fish behavior or health have been reported or

If you're treating a Fluke infestation, traditional wisdom suggests a single repeat treatment in four to five days after the first treatment to kill emerging larvae which may have been shielded from treatment by the mother-fluke or the egg.

Pros: The advantages are that Praziquantel is entirely benign to plants, fish and filter while clearing the Flukes and intestinal worms out rapidly and completely, even with fry.
Now, it can be considered that praziquantel is the least-expensive specific aquacultural Fluke treatment for ornamental ponds. When you consider that it requires only one or two doses and does NOT require water changes, nor plant removal, nor increased water agitation, this remedy is even superior to the "once king" Fluke Tab which contained a potentially damaging organophosphate and has enjoyed, at best, spotty availability during the summer.

Cons: Still not cost effective for lakes and natural ponds.
Non specific Fluke remedies such as Formalin or Potassium permanganate are not risk free.

Praziquantel is expected to be commercially available early in the Spring of 2003.
Precautions: Do not use on food fish or fish intended to be used as food. Keep out of rach of children. Do not take internally except by or on the order of your physician.


Doc Johnson

HELP! Sick Fish!
Twenty Steps to fish health. You LITERALLY can solve almost any Koi or Pond health outbreak with these twenty diagnostic steps and nothing's hard. But it's not "here's your pill" either. Downloads are available.
More than koi health, this site spans all things animal, by a real veterinarian who shoots you straight.

By Frank Prince-Iles. A UK authority who put this site together some time ago and which is still relied upon as a major source of good Koi and pond fish information

If you need pet information AND Koi pondfish and pond information you might like DrJohnson.com which has everything from pet info, to vet info, to koi and pond fish. It has it ALL! Pet Information.

© 2022 all rights reserved koivet.com (drjohnson.com)