The action of bepridil (5 mg/kg), perhexilene (5 mg/kg) propranolol (0.5 mg/kg), dipyridamole (0.5 mg/kg), amiodarone (10 mg/kg), pentaerythritol tetranitrate (40 microgram/kg) and nitroglycerine (40 microgram/kg) on cardiovascular manifestations of auditory-inducted emotional stress has been investigated in the conscious dog. Bepridil, perhexilene and propranolol considerably reduce tachycardia provoked by the anxiogenic stimulus, with nitroglycerin exerting an attenuated effect and the others with no significant effect on this parameter. Beppridil, nitroglycerin, perhexilene, propranolol and pentaerythritol all significantly reduce the elevation of the Robinson index, the first four with the same intensity. Only amiodarone and dipyridamole are without effect on this parameter of cardiac workload. Finally, none of the products under investigation significantly reduces systolic hypertension, associated with the induction of conditioned anxiety.