Please select the eligibility criteria that correspond to the clinical trial below.
Title: Memantine for the Treatment of Social Deficits in Youth with Disorders of Impaired Social Interactions: a Randomized-controlled Trial
Brief Summary: This study is a 12-week randomized-controlled trial of memantine hydrochloride (Namenda) for the treatment of social impairment in youth with Non-Verbal Learning Disorder, High-Functioning Autism Spectrum Disorder, and related conditions. Eligible participants will be males and females ages 8-18.

This study consists of up to 6 visits to Massachusetts General Hospital.


Options:
A: Inclusion Criteria:

* Male \& female subjects ages 8-18 years (inclusive).
* Diagnostic Statistical Manual (DSM)-5 Autism Spectrum Disorder (ASD) diagnostic criteria as established by clinical diagnostic interview
* At least moderate severity of social impairment as measured by a total raw score of ≥85 on the parent/guardian-completed Social Responsiveness Scale-Second Edition (SRS-2)14 and a score of ≥4 on the clinician-administered Clinical Global Impression-Severity scale (CGI-S)17.

Exclusion Criteria:

* IQ ≤70 based on the Wechsler Abbreviated Scale of Intelligence-II (WASI-II) Vocabulary and Matrix Reasoning subtests
* Impaired communicative speech
* Subjects currently treated with the following medications (known to impact glutamate levels): Lamotrigine, Amantadine, N-acetylcysteine, D-cycloserine
* Subjects treated with a psychotropic medication not listed above on a dose that has not been stable for at least 4 weeks prior to study baseline.
* Co-administration of drugs that compete with memantine for renal elimination using the same renal cationic system, including hydrochlorothiazide, triamterene, metformin, cimetidine, ranitidine, quinidine, and nicotine
* Initiation of a new psychosocial intervention within 30 days prior to randomization.
* Subjects who are pregnant and/or nursing.
* Subjects with a history of non-febrile seizures without a clear and resolved etiology.
* Subjects with a history of or a current liver or kidney disease.
* Clinically unstable psychiatric conditions or judged to be at serious suicidal risk.
* Subjects who meet on the Kiddie Schedule for Affective Disorders and Schizophrenia (K-SADS-E) for alcohol or drug dependence or abuse. If the subject has a recent history of substance abuse, there will be a two-week washout period before initiating the trial as an added precaution. There are no known safety issues relating to memantine and recent history of substance abuse.
* Serious, stable or unstable systemic illness including hepatic, renal, gastroenterological, respiratory, cardiovascular (including ischemic heart disease), endocrinologic, neurologic, immunologic, or hematologic disease.
* Subjects with severe hepatic impairment (LFTs \> 3 times ULN).
* Subjects with genitourinary conditions that raise urine pH (e.g., renal tubular acidosis, severe infection of the urinary tract).
* Known hypersensitivity to memantine.
* Severe allergies or multiple adverse drug reactions.
* A history of intolerance or adequate exposure to memantine, as determined by the clinician.
* Investigator and his/her immediate family defined as the investigator's spouse, parent, child, grandparent, or grandchild.
B: Inclusion Criteria:

* Meets current Diagnostic and Statistical Manual for Mental Disorders-Fourth Edition (DSM-IV) diagnostic criteria for AD and demonstrates serious behavioral problems. Diagnosis confirmed by Autism Diagnostic Interview- Revised (ADI-R)
* CGI score \> = 4 AND and Aberrant Behavior Checklist (ABC) Irritability/Agitation subscale score \> = 18 at screening and baseline (randomization)
* Mental age of at least 18 months
* Male or female 6 to 17 years of age, inclusive, at the time of randomization

Exclusion Criteria:

* Patients considered treatment resistant to neuroleptic medication based on lack of therapeutic response to 2 different neuroleptics after treatment of at least 3 weeks each.
* Patients previously treated and not responding to aripiprazole treatment
* The patient is currently diagnosed with another disorder on the autism spectrum, including PDD-NOS, Asperger's Disorder, Rett's Disorder, Fragile-X Syndrome or Childhood Disintegrative Disorder
* Current diagnosis of bipolar disorder, psychosis, or schizophrenia, or major depression
* A seizure in the past year
* History of severe head trauma or stroke
* Patients undergoing non-pharmacologic therapies (e.g., psychotherapy, behavioral modification) must have started at least 2 months prior to the initial screening visit and must remain in a consistent treatment program for the duration of the study.
C: Inclusion Criteria:

* Able to walk
* Diagnosis of Autistic Disorder, Asperger's Disorder, or PDD-NOS
* Have a score greater than or equal to (\>) 8 on the sum of items 1A, 2, 3 and 5 of the Compulsions Subscale of the Revised CYBOCS.
* Have a rating of at least moderate behavioral disturbance based on the modified Clinical Global Impression-Severity of Illness score (CGI-S) at the time of screening (See description below).
* Be free of psychotropic medication for at least one month for fluoxetine, two weeks for other SSRIs and neuroleptics, and for 5 days for stimulants prior to baseline ratings.
* Be judged reliable for medication compliance and agree to keep appointments for study contacts and tests as outlined in the protocol (both subject and guardian(s)).

Exclusion Criteria:

* Medical contraindications to therapy with SSRIs
* Prior exposure to citalopram (or escitalopram) of sufficient dose or duration to determine response status
* History of treatment failure to a clinically adequate trial of two select SSRIs
* Diagnosis of Rett's Disorder or Childhood Disintegrative Disorder
* Uncontrolled epilepsy, with a seizure within past 6 months
* Child weighs less than (\<) 15 kg at screening contact.
* Pregnancy
* Presence of chronic medical conditions that might interfere with study participation or where study participation would be contraindicated
* Clinically significant abnormal baseline laboratory testing
* History of bipolar disorder or manic episode induced by antidepressant exposure
* Documented need for ongoing psychotropic medications besides study medication (with the exception of stable dose (at least 3 month) anti-convulsants for seizures).
* Concomitant medication that would interfere with participation in the study.
* Recent (\< 2 months) initiation of behavior therapy (such as parent training, applied behavior analysis or behavior modification) in a clinic, with a private practitioner or in a school program. Participants who are in an established behavior therapy program (defined as greater than (\>) 2 months for clinic or private practitioner or greater than (\>) 1 month for school program) can be included in the study. Families will be asked not to initiate any new behavior therapy during the study.
D: Inclusion Criteria

* Autism based on DSM-IV criteria
* IQ \> 35
* Medically fit for the study in the judgment of the study officials

Exclusion Criteria

* Prior administration of secretin
* Acute or chronic pancreatitis
* Use of anticholinergics within 72 hours of study entry or anticipated need for anticholinergics during study
* Allergies to pork products
* Use of investigational drug within 1 month of study entry
* Change in any medication or other therapeutic modality being used to treat any neurodevelopmental or gastrointestinal symptoms of the underlying autism disorder within 1 month of study entry
* Any medical condition which, in the judgment of the investigator, would make the patient unable to safely participate in the study or comply with all study procedures
* Any medical diagnosis which could account for autistic spectrum disorder (i.e., Rett syndrome, Fragile X, tuberous sclerosis, disintegrative disorder, epilepsy, Landau Kleffner, other mental retardation syndromes, or history of severe motor delays or current sensory or motor impairment such as cerebral palsy)
* Hearing or visual impairments
* Use of psychotropic medications (except for occasional symptomatic use for sleep, etc.) within 6 months of study entry

Answer: A