DEAR DOCTOR K: I have bipolar disorder. I've experienced the highest highs and the lowest lows. How can one medication -- lithium -- treat both extremes?
DEAR READER: Bipolar disorder is certainly a condition of extremes -- extreme opposites. On the one hand are episodes of mania. During these episodes people with bipolar disorder feel like they're "on a high." Then there's the other side of bipolar disorder: the sadness and hopeless feelings of depression.