Antidepressants known as SSRIs are on a bit of a downer lately, at least for kids. A British regulatory agency just broadened an earlier warning to include four more SSRIs that should not be prescribed to children because the risk of suicidal thoughts may outweigh the benefits. (Only Prozac was deemed O.K. for kids.) In the U.S. a similar warning is in place for the drug Paxil. Meanwhile, health officials on both sides of the pond advise that young patients should be weaned from these drugs only under medical supervision.