I take 200 mg twice a day. I was diagnosed in Jan 2008 with possible bipolar, buy my dr changed the diagnosis to borderline personality disorder malor depressive disorder with panic attacks, GAD, agoraphobia with social phobia and PTSD. I have asked my dr to take me off this rx, but he thinks this medication is still helping, but I dunno. I took myself off the med for about 2 weeks, and I experienced serious withdrawl symptoms and my depression and anxiety got even worse. Maybe you need an increase in dosage, your body may have learned to tolerate it.
I am on a cocktail of rx. Lamictal 400mg, Paxil CR 75mg, Zoloft 100mg, Seroquel 200mg, Flexeril 10mg, Phenegran 20mg, and Diazepam 5mg 3x a day.
I would check with your dr about your options. Just hang in there, it takes time to find the right treatment. It has taken me almost 2 years, and my dr and I work closely to monitor side affects and effectiveness. I hope all works out for you. PS I have heard Abilify works wonders for bipolar patients.