I have a neighbor who's a Drug Rep. She's in her early forty's. Pharma is all she's ever done/knows, she's been in it for twenty years. She has two kids, single mom etc. I know her from my job as well as being her neighbor, because she calls on the office where I work.
She understands just how screwed she really is. She says so herself. She says she does not know what's going to happen to her and her kids. She doesn't work for Merck now, but she used to. She was laid off quite some time ago, but re-surfaced with the company she's with today. She told me that was "The worst mistake I've made. I should never have stayed in Pharma, but the golden handcuffs worked their magic on me and here I am."
I know the above about her because a long time ago, I had a conversation with her about me getting a job as a Rep. I'm sure you can figure out what her advice to me was regarding that idea.