...
Case reports have shown that an acute administration of 20–50 mg per kilogram of body weight in humans can be lethal. The lowest published fatal ingested dose is 4.3 mg/kg. Concerns about dangerous side-effects and rapidly developing cataracts resulted in DNP being discontinued in the United States by the end of 1938. DNP, however, continues to be used by some bodybuilders and athletes to rapidly lose body fat. Fatal overdoses include cases of accidental exposure, suicide, and excessive intentional exposure (overdose). The substance's use as a dieting aid has also led to a number of accidental fatalities."[1]
I would argue that's an entirely unsafe medication. That's not a drug that's short of perfection, it seems to be the sort of medication that will solve the obesity crises by actively killing people instead.