Paddock was prescribed 50 10mg valium 4 months ago:
http://www.dailymail.co.uk/news/article-4946882/Girlfriend-Las-Vegas-shooter-meet-FBI-LAX.html
Per the package insert:
https://www.accessdata.fda.gov/drugsatfda_docs/label/2008/013263s083lbl.pdf
"Psychiatric and paradoxical reactions are known to occur ... more likely in ... the elderly"
"Psychiatric and Paradoxical Reactions: anxiety, agitation, aggressiveness, irritability, rage,
hallucinations, psychoses, delusions, increased muscle spasticity, insomnia,
sleep disturbances, and nightmares. Inappropriate behavior and other adverse
behavioral effects "