This three site , 12-week , double-blind randomized controlled trial compared the relative benefits of three strategies for patients remaining symptomatic ( Liebowitz Social Anxiety Scale [ LSAS ] score > 50 ) after a 10-week trial of sertraline alone : the addition of up to 3.0 mg/day of clonazepam ( sertraline plus clonazepam ) , a switch to up to 225 mg/day of venlafaxine , or prolonged sertraline treatment with placebo ( sertraline plus placebo ) .