My ex was on antidepressants which had a huge impact on her life. If she missed her meds or (god forbid) was late on her prescription, it was terrifyingly bad.

Orthogonally, she also had sensitivities to light and epileptic symptoms. She told the doctor this, and the doctor doubled her dose of antidepressants. Just one of many, many stories. I've come to consider the higher-level of medicine quite scientific, but the on-the-ground doctors as unscientific. They mostly don't have time or enough feedback to make good decisions in most cases I've seen. That's a profession that shouldn't work on faith.