Yeah, manufacturing company consolidation and a flood created a big shortage of Adderall a few years ago and that filtered to the other ADHD meds because the DEA limits the number of them that can be produced because they consider them "Schedule II", the same amount of danger as fentanyl, which is crazy. And they never allowed them to make additional to make up for the lost stock while the factory was flooded much less taken into account the better diagnosis of ADHD these days meaning more people on them. I have a lot of issues getting mine due to the shortages, so I often have to ration. I got a milligram scale that's mostly accurate, though not exactly, so I can split the capsules evenly and take lower dosages on my days off. Which sucks not being able to function outside of work, but survival requires work...

As for getting monthly prescriptions, that's likely up to your insurance, doctor, pharmacy, and/or state regulations on "controlled substances". I get 3 month supplies on my Adderall from my insurance sponsored mail-order pharmacy. They also allow you to have refills on the prescription, though my doctor prefers to write a new one each time. I also take Ativan, but it's only a schedule 4 controlled substance and I dont take it regularly. None of my other meds are "controlled substances", so not sure about others.