I'd never heard of it before, but a quick search of wikipedia told me it's a tricyclic antidepressant with anxiolytic properties (treats symptoms of anxiety). Side effects including "Drowsiness, dry mouth, heartbeat irregularities, sweating, low blood pressure, constipation, blurred vision palpatations, dizziness and urinary retention. Can cause confusion in elderly patients or behavioural disturbance in the young. May produce weight gain or cause changes in the levels of blood sugar. Some patients report muscular discomfort, particularly in the shoulders."
http://en.wikipedia.org/wiki/Lofepramine