<qa>  What is the name of the drug used during the 28 days?4. With the exception of isolated doses of benzodiazepine which may be administered once or twice by the investigators of this study, psychotropic medication use including benzodiazepines and illicit drugs during the 28 days 42 days if fluoxetine prior to the PET scan. Investigators of this study may administer lorazepam for anxiety see procedures. 