My man Scottie....
"Star Trek: The Tholian Web (#3.9)" (1968)
Mr. Spock: [about theragen being a deadly Klingon nerve gas] If I remember correctly, it caused fatality only when used in pure form.
Dr. McCoy: That's right. And in this derivative, mixed with alcohol, it merely deadens certain nerve inputs to the brain.
Scott: Oh, well, any decent brand o' Scotch'll do that.
Dr. McCoy: Oh? Well, one good slug of this, and you could hit a man with phaser stun and he'd never feel it, or even know it.
Scott: Does it make a good mix with Scotch?
Dr. McCoy: It should.
Scott: [heading out with the beaker of theragen derivative] I'll let ya know.