Nedol did not produce 100% successful results when it was used once
The course of every treatment is unique. Depending on the species (Camallanus or not Camallanus), up to 4 treatments are required, as described in the instructions.
Ideally, there will no longer be any signs on the fish after the first treatment. However, the treatment must be carried out until it is completely finished. That is the only way to fully eliminate the larvae which are hatched from the eggs.
In cases of more severe infestation, the fish may take longer to shake all the parasites off of their bodies.
* Read the package insert for risks and adverse reactions and consult your veterinarian or pharmacist.