Almost all pharmaceuticals are dangerous substances. If abused they cause trouble. One might have no choice with some drugs if one wants to survive.
Drug interactions kill. Indeed, some drugs are best described as means of borrowing time by trading off some malady likely to kill earlier for something that will kill later. Patients should leave the prescribing of drugs to physicians.
Yes, I investigate every drug that I ever have prescribed for me. Fortunately they have been entirely antibiotics and painkillers. At age 55 I know that my luck will eventually run out. I want to put off any substances that "can cause liver damage".
The greatest evil is not now done in those sordid "dens of crime" (or) even in concentration camps and labour camps. In those we see its final result. But it is conceived and ordered... in clean, carpeted, warmed and well-lighted offices, by (those) who do not need to raise their voices. Hence, naturally enough, my symbol for Hell is something like the bureaucracy of a police state or the office of a thoroughly nasty business concern."
― C.S. Lewis, The Screwtape Letters