I truthfully don't remember the finer points of the study which was cited in the aforementioned lawsuit-- but I don't think it was particularly dose dependent. I mean, they were talking specifically about off-label use. Now for "label-use" it's a 250mg starting point on the low end of meds. Off-label folks take between 2.5mg to, typically, 50mg. The risk assessment was for off-label use (and thus smaller doses), so I'd be VERY inclined to think that even the small doses are potentially harmful.
I know if you dig around things like wiki and webmd you'll find the link to the '06 or '07 study. That *should* clear some things up if you want to go searching.
My experience with the drug in '07 involved being on it for a long weekend at doses smaller than 5mg, getting migraine headaches, being taken off the drug immediately, the headaches going away, and a series of neurological problems starting that in the short term had doctors saying they didn't expect me to live beyond a couple of my months (my autonomic system was misfiring). Most of the "acute" symptoms disappeared in a couple of months. I lost about 20 lbs of muscle mass in as many days, and started twitching and feeling incredibly weak. To date, I still twitch (primarily in my legs)and have weakness issues. I'm not as bad as I was, as I can now walk 20 feet from the couch to the bathroom, but use a cane to get around for longer distances. This started when I was in my mid-late 20s, not exactly the age most people associate with necessary use of a cane. (Well, to be fair, the doctors actually wanted me to use a walker... mmhmm.)