A month before a South Florida foster child live-streamed her suicide on Facebook Live, the dosage of an antidepressant given to her was doubled by a doctor. The Miami Herald reported Sunday that Zoloft, the antidepressant prescribed to 14-year-old Naika Venant has a critical warning that it increased the risk of suicide in children. The drug had a “black box” warning that is U.S. Food and Drug …