I sometimes forget to take my ADHD medication on several days and only realize after the fact that I was very unproductive. My friends will also notice that my mind was more cluttered again. I dive from tangentially related thing to the next, only connected in my mind by emotion. Eventually I reach a stack overflow - I'll have no idea how the conversation started or what the real topic or task were.
You can still suffer from the same, every day normal forgetting of things on ADHD medication. It doesn't instantly make you superhuman. You still need systems to remember things effectively, ADHD or not.
