Effect of OROS methylphenidate on encopresis in children with attention-deficit/hyperactivity disorder

Increased Frequency of Encopresis in a Child Diagnosed With Attention Deficit/Hyperactivity Disorder and Encopresis After Atomoxetine Use: A Case Report

Attention deficit hyperactivity disorder (ADHD) is among the most frequently reported coexisting psychiatric conditions in children with encopresis. Some case reports state that atomoxetine-a selective presynaptic norepinephrine reuptake inhibitor-approved for treatment of ADHD is also effective in the treatment of coexisting encopresis. Contrasting those reports, here we present a case diagnosed with ADHD and secondary encopresis without constipation whose encopretic symptoms increased after atomoxetine treatment and discuss possible mechanisms.

The effectiveness of methylphenidate in the treatment of encopresis independent from attention-deficit hyperactivity disorder symptoms

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.