I’m not sure where this falls between “inaccuracy report” and “horrifying personal confession” but, assuming the most commonly prescribed dosage and speaking from personal experience, swallow a handful of five oxycodone does not cause you to die several minutes later. I mean, don’t get me wrong, you probably shouldn’t DRIVE, but you would almost certainly still be alive.
Then again I don’t know what the dosage is on any of the in-game drugs I’ve taken in real life, clonazepam (a diazepam), prozac (fluoxetine), and oxycodone (percocet) because the game keeps it fairly abstracted.