See, in a normal brain, happy little serotonin bubbles fly around, having a great time. This prevents you from sinking into a bottomless pit of despair and anguish because the emptiness and futility of modern life is destroying your soul.
But you don't have a normal brain. You've got a pathetic mutant brain full of flaccid nerves that are no good for anything.
I'm certain that the author's intention is to mock the way psychiatric medicines are marketed (particularly in the US, where it's legal to market prescription drugs directly to patients) rather than the people who have to take them, but I thought I should explicitly tell you that in case anyone's having an over-sensitive day :)