Methylphenidate vs. Risperidone for the Treatment of Children and Adolescents With ADHD and Disruptive Disorders

Attention Deficit/Hyperactivity Disorder (ADHD) is one the most prevalent mental disorders among children and adolescents, with a prevalence of 5% in western culture. The basics of the disorder: inattentive and hyperactive/impulsive behaviors that manifest in a variety of settings causing a dysfunction in everyday life. ADHD can be subdivided into three sub-types: predominantly inattentive, predominantly hyperactive/impulsive or combined type. Common co-morbidities of ADHD are disruptive disorders; Oppositional defiant disorder (ODD) being the major one with about half of children with the combined sub-type ADHD and about a quarter of children with the predominantly inattentive also suffering from ODD. Conduct disorder is a co-morbidity for about a quarter of children with the combined sub-type ADHD. The co-occurrence of these disorders is thought to have a negative effect on the outcome of both of them.

Methylphenidate (MPH), short or long acting, is the mainstay of medical treatment for ADHD patients, it's efficacy proven in a variety of studies. It should be noted that MPH has also been proven to have a beneficial effect on children with disruptive behaviors. For children with disruptive disorders Risperidone is the mainstay of medical treatment, and has been proven in clinical trials.

To the best of their knowledge, a "head to head" study comparing these two drugs for the treatment of pediatric patients with ADHD and co-morbidity of disruptive disorders was never done before. The investigators aim is to examine the efficacy and tolerability of MPH vs. Risperidone in this population. In addition, the investigators will apply DSM5's cross cutting symptom measures scales is order to further define this unique subset of patients.

Disruptive mood dysregulation disorder (DMDD) is a new diagnosis in the latest version of the diagnostic and statistical manual (DSM5). It's main features: sever recurrent temper outbursts that are inconsistent with developmental level and occur on average three times a week, the outbursts occur in at least two settings and the mood between outbursts is irritable or angry. This diagnosis is in the differential diagnosis of ADHD with disruptive disorders.

Secondary study aims:

1. Comparing the efficacy and tolerability of MPH vs. Risperidone in the treatment of depressive symptoms in children and adolescents with ADHD and disruptive disorders.
2. Comparing the efficacy and tolerability of MPH vs. Risperidone in the treatment of manic symptoms in children and adolescents with ADHD and disruptive disorders.
3. Comparing the impact of MPH vs. Risperidone on overall every day functioning of children and adolescents with ADHD and disruptive disorder.
4. Comparing the impact of MPH vs. Risperidone on nighttime sleep of children and adolescents with ADHD and disruptive disorder.
5. Comparing the impact of MPH vs. Risperidone on weight and height of children and adolescents with ADHD and disruptive disorder.
6. Assessing the overlap between the diagnosis of ADHD and disruptive disorders and DMDD.
7. Assessing mood disorders and response to MPH vs. Risperidone treatment in children and adolescents with ADHD and disruptive disorder.

Eligibility Criteria:
Inclusion Criteria:

* Clinical diagnosis of ADHD (any sub-type) with oppositional defiant disorder.
* Clinical diagnosis of ADHD (any sub-type) with conduct disorder.
* Clinical diagnosis of other specified ADHD with oppositional defiant disorder.
* Clinical diagnosis of other specified ADHD with conduct disorder.
* Clinical diagnosis of unspecified ADHD with oppositional defiant disorder.
* Clinical diagnosis of unspecified ADHD with conduct disorder.

Exclusion Criteria:

* Participant who do not qualify for inclusion criteria.
* Participant who are not willing to join the study.
* Epilepsy.
* Neuro-genetic syndromes.
* Brain tumors.
* Autism.
* Participants who are under psychiatric medication and have changed it (dose or kind) in the last month.
* Congenital heart, kidney of liver defects.
* Cardiomyopathies.
* Past hypersensitivity to Methylphenidate or Risperidone.