A study of 581 participants in a number of countries by researchers from Mexico, Canada and the U.S. looked into the effectiveness of the drugs duloxetine and venlafaxine in treating generalized anxiety disorder. The study compared the drugs to a placebo. Both drugs produced significant improvements on the Hamilton Anxiety Rating Scale and were also found to be effective in alleviating some of the physical (somatic) symptoms of anxiety.
Nicolini, H. ... [et al] - Improvement of psychic and somatic symptoms in adult patients with generalized anxiety disorder: examination from a duloxetine, venlafaxine extended-release and placebo-controlled trial Psychological Medicine February 2009, 39(2), 267-276
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