It has addictive potential, but in my experience, treating it with the respect it deserved, I would say it's nothing compared to caffeine. I can easily skip meds from an entire week (which I will spend scrolling HN), yet every single day there is a voice in the back of my head telling me that a cup of coffee would be a fine thing to have right now.
I'm on a child's dosage too, which is crazy. Yeah yeah, I know everyone is different and all that, but I can see why this drug is a Schedule II Controlled Substance in the US. I am not sure how addicting it is from a psychological point of view at therapeutic dosages, but it's damn easy to build a dependence in my experience.
I can technically go without, but what I crave more than the feeling of the meds is the ability to be semi-functional. I do not respond super positively to the meds to begin with, but they are definitely better than nothing... and perhaps sometimes detrimental (focus on the wrong thing).
I always try to take breaks when I can, but life rarely allows for me to do such anymore. On weekends now, I typically just half-dose or take a day off. Seems to be enough to help with the burnout.