Earlier quoted context omitted.
For me, historically drugs like this for ADHD or depression or gastric bypass or whatever tend to lose effectiveness over time as the body adjusts. Not for everyone but for enough where you've got a short term gain that ultimately compounds the original problem. Medication can be a slippery slope into side effects and rotating dosages/medicines. Especially for behavioral medicines.
ADHD medications do not lose effectiveness over time. That's magnesium deficiency.
I mean, they're mostly stimulants, which definitely lose effectiveness over time. It would be really weird if they didn't as that's basically how our bodies work in general.
Note: I have been prescribed said medication, but have not started taking them yet so I might be entirely wrong in the practicalities (and how would one disentangle the psychological impact of medication from the physiological impact?).