There is good news today for those who suffer from depression: The largest study ever done on treating depression has found that patients who didn't get well with the first medicine they tried had a good chance of succeeding the second time around. The study found little difference among the five drugs tested: Celexa, Zoloft, Wellbutrin, Effexor and Buspar -- and wasn't designed to compare them. All proved similarly effective and relatively safe. The clear message, doctors said, was that antidepressants should be given a 6-to-12-week chance to work and that if one doesn't help, another should be tried."It's important...