Botox is contains one of the most potent toxins known on earth, and people will happily inject it directly into their face just for the chance of a slightly smoother face

And fentanyl can kill an entire city, but hospitals still keep it around for pain control. Diphenhydramine will make you hallucinate spiders everywhere, while you slowly die. But you can buy it over-the-counter to treat allergy symptoms. The foxglove flower can cause you to go into heart failure… But we use it to treat heart conditions.

Dosis sola facit venenum, as the medical world likes to say. “The dose makes the poison.”