Hello Shelbyinok, There are several different types of ADHD medications that may be used alone or in combination. Most of them can cause heart problems or exacerbate an existing condition. I would have loved to know which one he is on right now. Psychostimulants (also known as stimulants) are the most commonly used ADHD drugs. Although these drugs are called stimulants, they actually have a calming effect on people with ADHD. These drugs include (which can cause potential heart condition ): - Amphetamine-dextroamphetamine (Adderall) - Dexmethylphenidate (Focalin) - Dextroamphetamine (Dexedrine, Dextrostat) - Lisdexamfetamine (Vyvanse) - Methylphenidate (Ritalin, Concerta, Metadate, Daytrana) A nonstimulant drug called atomoxetine (Strattera) may work as well as stimulants, and may be less likely to be misused. Some ADHD medicines have been linked to rare sudden death in children with heart problems. Talk to your doctor about which drug is best for your child. Hope this answers your question