Is Ritalin a carcinogenic?

Methylphenidate—the prime ingredient in Ritalin—has shown to cause cancer in laboratory animals although researchers have been reluctant to extend these findings to human beings. However, a 2005 study conducted through the University of Texas showed that 12 children given therapeutic doses of methylphenidate resulted in treatment-induced chromosomal aberrations. All malignant tumors contain chromosomal aberrations.