Here’s a good primer on ADHD medications for adults with ADHD — it will help you know what to expect from medication:
A Patient’s Primer on the Stimulant Medications Used to Treat ADHD
And here’s advice on how to recognize when ADHD medication is working:
Penny
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism