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Dec. 31, 2003 -- People with herpes who take an antiviral drug once a day can reduce the risk of transmitting the virus to their sexual partners by nearly 50%. A new study shows that daily therapy with the antiviral drug Valtrex significantly lowers the risk of transmitting genital herpes among heterosexual couples in which one partner is infected with the herpes simplex virus type 2 (HSV-2). Valtrex is commonly used to treat outbreaks of genital herpes, but preliminary results of this study prompted the FDA to approve a second indication for Valtrex in reducing the risk of transmitting the disease to susceptible heterosexual partners. The complete results appear in the Jan. 1, 2004, issue of TheNew England Journal of Medicine. does prevacid cause spots in vomit can taking prevacid lower b-12 prevacid eating online prevacid