Non-stimulant medications approved by the FDA for ADHD are Atomoxetine, Clonidine, and Guanfacine. Non-stimulant medications are used if someone does not respond to stimulant medication, has a history of drug abuse, or experiences severe side effects from stimulants. Other medications, like antiviral drugs and antidepressants, also do not have any stimulant effects and may be used to treat ADHD.