Before I leave the bullshit below I want to say I'm not a scientist.
Would adrenaline not be fast acting? It seems like a Wile E. Coyote setup. You inject the gorilla with adrenaline and then get ripped apart as the ex just meep meeps through the window.
100 cc is 100 ml, which is like half a glass worth of adrenaline. You'll need a wide ass blowgun, and it's unclear if you have the lung capacity to clear the distance to the gorilla.
The solution? A second gorilla who's been pavlov trained to blowgun the first gorilla on cue.