To elucidate the role of catecholamines in attention deficit disorder,
the authors conducted an open 8-week trial of L-tyrosine in 12 adults with
attention deficit disorder, residual type. Eight showed marked to moderate
clinical response in 2 weeks; at 6 weeks these eight developed tolerance,
suggesting that L-tyrosine is not useful in attention deficit disorder,
residual type.Abstract Teaser