"Well what about non normal drugs like ethylene for example of non-organics (sodium bromide)? Would those do the trick?"

"I don't think any drug would work
Zombies have basic motor functions
the internal organs don't work this is common knowledge that is found in almost every zombie movie
also many zombies have lost most of their blood as their throat was ripped out or other grusom death

No blood, no working heart, the brain barly works"

"Oh Contrare...Many zombies can be seen gasping for air (not normal breathing as the actor is doing to stay alive) which shows working lungs. EVERY zombie is seen spurting blood when wounded (indicates a heart circulating blood), considering they didnt actually shoot/stab the actors I think this is a good sign. We DONT KNOW how well the brain of a Zombie works... all we know is what is given to use in FICTION, even what I just stated, considering this wiki is devouted to those works of fiction though I reserve my right to speak freely as if I know everything :P. So by my logic based after said works of fiction the internal organs (unless eaten in the process of zombification) are working just fine, more than enough to administer the drugs. Either way... Zombies arn't an entirely new SPECIES, they are more of a subspecies from the human race if anything... they are altered humans, not recreated humans."

"would ghouls be susceptible to concussions? like if you hit a ghoul in the head with a bat, not hard enough to kill it, would it be disoriented, knocked out? i know they have the most basic of brain function, but a whack to the head is a whack to the head. "