“…Nortriptyline and desipramine are generally preferred to amitriptyline because of lower incidence of anticholinergic side effects such as sedation, orthostatic hypotension, cognitive decline, and constipation (Watson et al, 1998). Furthermore, despite amitriptyline is probably the most widely studied TCA for the treatment of PHN, nortriptyline and desipramine have recently been shown to be equally effective (Watson & Oaklander, 2002;Hempenstall et al, 2005;Rowbotham et al, 2005). A limiting factor in the clinical use of TCAs is represented by their side effects, including dry mouth, fatigue, dizziness, sedation, constipation, urinary retention, and palpitations.…”