'Danger' seems like an applicable label for the drug after all the stress it's put them through, but... I got nothin' for the 'Poisonous' one. That's kinda the last thing you want to see when speaking with a pharmacologist, ya know?

The component ingredients of — or the reagents used to produce and combine — pharmaceuticals are often toxic, at least in the kinds of concentrations/dosages required to synthesize large batches of a given compound, and any substance is a poison in sufficient quantity.

(A chem prof once told me that the main distinction between cooking and chemistry is that in chemistry, you can't lick the spoon.)