Inclusion of individuals with low IQ in drug development for autism spectrum disorder.

Although individuals with intellectual disability (ID) and/or limited language ability make up a significant proportion of those with autism spectrum disorder (ASD), they are routinely excluded from ASD research. As a result, this vulnerable population is prevented from participating in and deriving full benefit from research. In this commentary, we expand upon points made by McCracken and colleagues (this issue), who describe several opportunities for improvement in drug development for ASD related to the inclusion of individuals with ID and/or limited language ability.