Isn't part of the problem that the difference with some drugs between a high and an overdose is pretty small? SO you would still get accidental overdoses with those drugs
Not as much as you might think; the variation in potency and composition is much more significant.
Relatively few people overdose on (OTC) acetaminophen, despite the relatively narrow window between the therapeutic dose level and the harmful overdose level. Quality control -- we know exactly what's in a tablet, down to the milligram.
