Google Gwen Olsen, former drug company rep and watch the interviews of her on youtube as she gets into how psych meds cause the same type of memory issues as having a stroke.

I was on meds for bipolar 2 for 13+ years, and I went from being very sharp with a great memory to where I have a hard time expressing myself verbally. I do much better writing, but my ability to recount something I've read or seen verbally after taking all those meds is embarrassing.

Stay off meds if you can. There are lots of great alternative treatments such as amino acids that allow the brain to produce the neurotransmitters that keep your mood stable.

Here's a good article on treating depression using alternative treatment.

Treating Depression Naturally Is Possible ? Clean's The New Black