Comment by jaggederest

Yep. What you find often is that the drug is effective right away, at a 20-30-40% effectiveness level. But over time you learn to take advantage of the benefits more effectively, and get more used to the side effects, so it tends to increase significantly in effectiveness at the same dose over 6-8 weeks much like SSRIs, not because the effects last that long, but because you use the tools to improve the tools.