once a rat has been tested on and survives, does any of the drugs or make up efgect its brain?

Question: once a rat has been tested on and survives, does any of the drugs or make up efgect its brain?
- Keywords:
  drug,
  experiment,
  rat
Asked by MCR to Damien, Rachael, Simon, Suzi, Tim on 16 Jun 2011.
- Suzi Gage answered on 16 Jun 2011:
  
  Hi @theawakening
  I’ve never done any testing on animals myself, but I am sure that animals are not kept in a state of undue pain. As far as I am aware, after they have been tested on they would be put to sleep in a humane way, but I’m not sure about this.
  
  Sorry I can’t properly answer your question.

Question: once a rat has been tested on and survives, does any of the drugs or make up efgect its brain?