Within days of starting haloperidol treatment for a psychiatric disorder, a young male patient developed severe generalized muscle rigidity and a high fever. In the emergency room he was incoherent, with increased heart rate, hypotension, and diaphoresis. Laboratory studies indicated acidosis, leukocytosis, and increased creatine kinase. The most likely reason for these symptoms is that the patient was suffering from

Within days of starting haloperidol treatment for a psychiatric disorder, a young male patient developed severe generalized muscle rigidity and a high fever. In the emergency room he was incoherent, with increased heart rate, hypotension, and diaphoresis. Laboratory studies indicated acidosis, leukocytosis, and increased creatine kinase. The most likely reason for these symptoms is that the patient was suffering from

Which one of the following drugs most resembles the psychoactive constituent(s) of St. Johns wort in terms of proposed mechanism of action?

A psychiatric patient taking medications develops a tremor, thyroid enlargement, and leukocytosis. The drug he is taking is most likely to be

A drug suitable for producing a brief (5 to 15 minute) increase in cardiac vagal tone is

The introduction of this drug may represent a novel approach to the treatment of major depressive disorders since it appears to act as an antagonist at alpha2-adrenoceptors in the CNS.