$sthg = $dbh->prepare_cached("SELECT DISTINCT login FROM usuarios WHERE filial=? AND auth=? AND login<>?");
$sthg->execute($filial, 4, $filial);

#...

$sthn = $dbh->prepare_cached("SELECT DISTINCT nome FROM usuarios WHERE login=? AND filial=?") or die "ERRO!"; 
$sthn->execute($gerente, $filial);
# ...