Several medications are reported to be effective in treatment of encopresis. However, mechanisms of action related to these drugs are not known. We report a patient with ADHD and encopresis whose encopretic signs have disappeared with long acting methylphenidate while they have not changed with atomoxetine.
		                        		
		                        		
		                        		
		                        			Encopresis*
		                        			;
		                        		
		                        			Humans
		                        			;
		                        		
		                        			Methylphenidate*
		                        			;
		                        		
		                        			Atomoxetine Hydrochloride