While some genes have been linked to autism spectrum disorder, the exact cause of the disease isn’t known. With a dearth of knowledge about the disease, there haven’t been any drugs specifically developed to treat autism, although Risperdal (risperidone, Johnson & Johnson) and Abilify (aripiprazole, Bristol-Myers Squibb Co. and Otsuka Pharmaceutical Co. Ltd) are approved to treat irritability associated with autism.