Deworming Corydoras

What drug is best for prophylactically deworming Corydoras of internal parasites? I know cories are common discus tankmates so I hope I can get some answers. Some preliminary research of the usual drugs has come up with the following:

Avoid:
Praziquantel - causes listlessness in cories and discus.
Metronidazole - potentially causes reproductive harm

Candidates (no adverse side effects I could find):
Flubendazole
Levamisole

I'd like to hear your thoughts on these drugs, and from those who prophylactically deworm their fish.

Kusuri wormer plus I used, corydoras still alive.

I've done this in the past for wild caught cories, but don't do this for farm raised ones. They go into a bucket with airstone, 3 drops/gallon of formalin, for an hour. I watch the fish. If anyone goes belly up, I make a large water change to dilute out the formaldehyde.

Willie

I have had no issues using any of those meds on any fish. Of the 3 (flubendazole and levamisole are similar in function), prazi is probably the most important, as it kills tapeworms

Praziquantel for tapeworms and Levamisole / flubendasole for roundworms are the most ussual meds . for deworming .
Listlessness and loss of appetite during the treat.if there are any ,lasts only during the 1 day treatment .Fish are back in normal right after the first water change .

The only issue I know of with wild caught cories is flukes. The formalin treatment described above will knock flukes off the gills. It's quick and effective, and can be done in a bucket. This is the protocol Corydoras breeders use to spawn their wild caught fish.

Willie