...was prescribed an anti-anxiety drug in June that can lead to aggressive behavior, the Las Vegas Review-Journal has learned.  Paddock purchased the drug — its brand name is Valium — without insurance at a Walgreens store in Reno on the same day it was prescribed. He was supposed to take one pill a day.
Diazepam is a sedative-hypnotic drug in the class of drugs known as benzodiazepines, which studies have shown can trigger aggressive behavior. Chronic use or abuse of sedatives such as diazepam can also trigger psychotic experiences, according to drugabuse.com. ...Finnish adults and teens convicted of homicide showed that their odds of killing were 45 percent higher during time periods when they were on benzodiazepines.