Niskord
As it was explained to me when I made Droksin, Yamataians have similarities in blood to Nekos, but not exactly like Neko hemosynth blood. Thus, it would work for the Yamataians, but it would be useless to Nekos.
Panick
Do Nekos have adrenal glands? It would affect Yamataians, Nepleslians, and
Hilarity
It wouldn't work on them (even though it doesn't make any sense to me). It's effects will last depending on the dosage given.
Dr. Fixit
Regenerating and healing are the same thing, in my mind. It'd boost the regenerative powers of Yamataians and Nekos, and then boosts the healing powers of Nepleslians and Geshrin, if it has to be precise. It'll pretty much double the healing rate. It will last for about 3 hours.
Numb
It will last up to 7 hours, depending on the body, etc.
Note: Most of these stimulants probably wouldn't work on Nekos because of their hemosynth blood. At least, that is how it has been explained to me in the past.