“Once established, the enhanced behavioral response to repeated L-DOPA-administration (6.5 mg/… dyskinesia in man and MPTP-treated monkeys, be selectively reduced by coadministration of L-DOPA … yohimbine (10 mg/kg, -95%), the 5-HT uptake inhibitor 5-… beta-adrenergic receptor antagonist propranalol (10 mg/kg, -35%).”