Why Treating Depression Is Complicated

“S.S.R.I.s don’t work the same for everybody,” Dr. Anthony Rostain, a psychiatrist and professor, says on “The Opinions.” In a conversation with the Times Opinion contributing writers David Wallace-Wells and Rachael Bedard about the nuances of S.S.R.I. use, he explains why treating depression is complicated by how much we still don’t understand about what causes it.