Clearly the real drug he’s dealing with is the bad faith he’s hopped up on; but this isn’t even a “don’t get the banal trade names confused/beware powers of ten” pharmacist problem; one of these things is a drug, the other is a fumigant pesticide that has never been represented or sold as having medical applications. Guy couldn’t direct you to the right aisle at the pharmacy(not that they sell hydrogen cyanide fumigation gear at CVS, but the mouse traps and the prescription drugs are definitely in different parts of the store).
Not that it’s relevant to contemporary pharmacy practice; but I don’t think that hydrogen cyanide is even one of the agents that had an interesting history as both a chemical weapon and an inspiration to chemotherapy research, like lewisite and the nitrogen mustards.
