Women nearly twice as likely to use the drugs as men, CDC report finds.
They work by affecting brain chemicals that regulate mood.
In patients 65 and older, use of opioids, antidepressants, tranquilizers and antipsychotics more than doubled from 2004 to 2013.
More study is needed, but the compound may fight the condition in a different way.
Many adults take five or more medications, often for preventable ills.
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