Question: Has there ever been a time that the medication was fine with animals but not fine with homosapiens?

Robert Ives answered on 19 Jun 2019:

Hi Abigail. Yes. Many medicines that have been shown to work in animals do not work in humans. This might be because the medicine causes side effects and is toxic, but also, sometimes the medicine just doesn’t work very well in humans. By using animals first and selecting the most promising medicines, we increase the chances of finding a medicine that actually helps people live longer and happier.