“…It is more potent than atropine, another cholinergic agent, and has less undesirable effects because of an inability to cross the blood-brain barrier. To avoid systemic absorption and side effects such as dry mouth, visual disturbance, and urine retention, topical glycopyrrolate has been assessed in many studies, which have shown it to be an effective, safe, and satisfactory treatment for craniofacial hyperhidrosis, 134,135 compensatory sweating after sympathectomy, 136 and gustatory hyperhidrosis. 137,138 This treatment modality is well tolerated in most patients apart from transient dry mouth, sore throat, accommodative failure, and headache in a few patients.…”