Hello--chiming in here...I assume you mean you've been on 300mg? DO NOT reduce to 150mg from 300mg. It will throw you into withdrawal, the likes of which I woudn't wish on anyone.
Read through all these posts.
Slow taper is how to best avoid the worst of WD symptoms. Slow taper=10-15% reduction in mg every month to month and half. Does it take awhile? yes, but it's worth avoiding the WD symptoms--trust us.