About half of adults with autism spectrum disorders (ASD) use six or more classes of prescription drugs in a year. Almost 20% of adults with ASD use three or more classes of psychotropic drugs within a period of 90 days.

In addition to common use of psychotropics such as antipsychotics, antidepressants, and anxiolytics, many adults with ASD also use other medical treatments including dermatologic agents, antihyperlipidemics, gastrointestinal agents, antiparkinsonian agents, and immunologics.

There is a glaring need to build strong evidence for pharmacological interventions used by individuals with ASD, especially adults. More clinical trials including adults with ASD would help healthcare providers design optimum treatment regimens for their patients.