In college I used as a source for a paper on psychiatry, GAD and emerging medications a study conducted to compare the efficacy of pregabailn to placebo and alprazolam in the treatment of individuals diagnosed with GAD using DSM-IV-TR criteria. In it, three pregabalin groups were used; 300mg/day, 450mg/day, and 600mg/day groups. One alprazolam group was used, at a daily dosage of 1.5mg. And then there was a control group, which received a daily placebo (inactive) pill. Measurements were conducted over a 4-week period to quantify and compare improvements in both
psychic anxiety symptoms (mental manifestations of anxiety [disastrous thinking, etc.]) and
somatic anxiety symptoms (physical manifestations of anxiety [racing heart, etc.]).
By the end of the 4-week study, the 1.5mg/day alprazolam group, as well as all three pregabalin groups, demonstrated a significant reduction in psychic symptoms of GAD over placebo; interestingly, though,
only the 300 and 600mg pregabalin groups demonstrated a significant reduction in somatic symptoms of GAD over the placebo group, whereas the 1.5mg/day alprazolam group and the 450mg/day pregabalin groups did NOT demonstrate clinically significant improvements!
Here's a free link to the full study:
Archives of General Psychiatry Vol. 62 No. 9, September 2005.
Pregabalin for Treatment of Generalized Anxiety Disorder
A 4-Week, Multicenter, Double-blind, Placebo-Controlled Trial of Pregabalin and Alprazolam
Personally, I'm not *entirely* surprised about the alprazolam group not showing physical anxiety symptom improvement, simply because alprazolam has less musculo-skeletal relaxant properties than some other benzodiazepines, such as diazepam, but what really perplexes me (and the study's authors) is that the low-end and high-end pregabalin groups showed physical improvements, but the middle group did not. But, for the purposes of answering your question, if I were to base my answer to you off of the results of this study, I suppose I would suggest either a dose of 300mg/day or 600mg/day, since both these groups were the only groups to have shown improvements in both realms; 450mg took care of half the symptoms, but for someone in the US diagnosed with GAD who is scripted Lyrica for it (off-label, obviously), I *need* those somatic anxiety symptoms taken care of as well as just the debilitating psychic symptoms. Both psychic and somatic symptoms of anxiety can be equally as uncomfortable for me and in terms of treatment, they must be inseparable.
Interesting thing, though, is that my own scripted amount of Lyrica per day happens to be 450mg/day - the one pregabalin dosage that *didn't * work for somatic symptoms in the study, and I should note that it *does* work for all of my symptoms
Hope all of this maybe h elps, although now that I've typed it all up, it seems rather more likely to confuse the issue rather than answer the question. However, for what it's worth
~ vaya