Its what nursing homes used to do to get patients out of their facility. It was called buffing up or snowballing.
Probably happens using everyday, mass produced, synthesized pharmaceuticals. What the elite pols get might be specially concocted or specially derived; more natural compounds that don't have harmful side effects, but too expensive to market to the public. I have no knowledge of such things, but it sure seems that a lot of highly placed past-their-prime pols just keep on going and going and going.