Adderall and Ritalin are proven medications for managing attention deficit in adults.
Unfortunately, these two drugs — both stimulants — can also amp up blood pressure, which can be extremely hazardous for many adults who are already at risk from hypertension.
Several non-stimulant meds are available for adult ADHD. Atomoxetine (generic Stratera) is specifically intended for ADHD and is extremely affordable. Guanfacine and Clonidine are anti-hypertension meds that help some adults with hyperactivity and (less so) with attention deficit. Buproprion (generic Wellbutrin) is an anti-depressant that helps some adults with hyperactivity and attention deficit.
Here is a nice summary article from WebMD: Nonstimulant Therapy and Other ADHD Drugs