On Halloween, I started taking Lexapro, an SSRI, to treat my depression. On the first day, I noticed an obvious and immediate effect as… — On Halloween, I started taking Lexapro, an SSRI, to treat my depression. On the first day, I noticed an obvious and immediate effect as soon as it kicked in. I felt like someone had flipped a light switch in my mind. I felt good in a way that I have…