A recent question Cat suddenly became paralyzed has a cat with sudden onset paralysis, after starting a new drug. The companies drug literature does not list this as a side effect, but the OP found that several pet owners had seen paralysis after administering the drug.

although I did find pet-owners who had the same experience on related forums.

User comments suggest that as the side effect is not listed by the manufacture it could not possibly be related 1 & 2

You've done the research and there really isn't any reason to think there's a link between the felimazole and your cat's new symptoms.

I'm referring to the listed side-effects from studies.

What are the actual legal requirements for pet medications? Does the vet or the manufacture need to report this possible side effect?

As far as I can tell, reporting is completely voluntary.

The FDA encourages veterinarians and animal owners to report adverse drug experiences and product defects associated with animal drugs or animal devices souce emphisis mine

There are no requirements for drug makers or veterinarians to report side effects.

You can't prove a negative, so this remains an open question. I will happily modify or delete this answer if reputable sources for mandatory reporting are found.

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