Amphetamine / dextroamphetamine
"I'm 57 years old.  Both my sons were diagnosed with ADHD.  I went out with a guy with ADHD and the symptoms he described were just like mine. My doctor was hesitant about prescribing it to someone my age.  I went home and got it filled and about 45 minutes later I was amazed.  I was talking, being sociable, and enjoying the people I had known for years and barely talked to.  I have never felt some calm.  I thought, "wow, is this what normal people feel like?"  I'm much more focused and productive even though I've always been successful and done well in school.  I tried the regular Adderall and it didn't help at all. I'm only taking 10mg and it's working great!"