pharmacokinetics (n.)

word-forming element meaning "drug, medicine," also "poison," from Latinized form of Greek pharmakon "drug, poison" (see pharmacy).

"relating to muscular motion," 1841, from Greek kinētikos "moving, putting in motion," from kinētos "moved," verbal adjective of kinein "to move" (from PIE root *keie- "to set in motion").

Buster Keaton's subject was kinetic man, a being he approached with the almost metaphysical awe we reserve for a Doppelgänger. This being was, eerily, himself, played by himself, then later in a projection room, watched by himself: an experience never possible to any generation of actors in the previous history of the world. [Hugh Kenner, "The Counterfeiters," 1968]

From 1855 as "causing motion." Related: Kinetical; kinetically.