It was chlorambucil my cat was on.
I got this terrifying warning sheet with her first dose, so for a week afterwards we were to wear gloves handling her food bowls, toys and clearing up after her any body fluids or waste was to be cleaned up immediately with hot soapy water and she wasn’t to sleep with us.
It totally freaked me out tbh, because well, cat, they’re basically always covered in spit, lol. She also liked to play fetch and spent most of her time next to me, so I couldn’t work out how that was different to sleeping next to her.
The oncologist said there’s never actually been a case of a pet making anybody ill, that it’s really unlikely given the dosage, but, for obvious reasons they have to give you a serious warning about it all.
My dog wasn’t ill after raiding the litter tray the morning after a dose as a puppy
that did involve lots of panicky phone calls to the vet and them having to contact other people before deciding it would be fine, rofl, but it was...
So basically, you should get proper instructions and you want to follow them, but, keep in mind that they have to make it sound like more of a risk than it probably is.