Nov 1, 2012 · A single randomized controlled trial investigated the efficacy of atropine to reduce salivary hypersecretion with 2 drops of 0.5% SL atropine (0.5 mg total dose). 4 In the 22 adults who were receiving palliative care in the trial, the drug failed to show any benefit versus placebo. 3 The authors of this study suggested that their findings might ...