I highly recommend you take supplements with your medication.
At 25 I thankfully found out I had ADHD, then researched/hyperfocused for about 6 months and then got myself evaluated and diagnosed. I started taking my medication and came up with a nootropic stack of necessary and crucial supplements to take with my medication. The reason the medication does not work to its full potential for a large amount of people, and why it creates a myriad of negative side effects or stops working like it used to, is because your neurotransmitters get depleted after continuous stimulant use. Not to mention the high amount of oxidation that is not fought off. Different supplements help bring back up those depleted neurotransmitters (Dopamine, Serotonin, and Norepinephrine) (differences among those vary depending on the stimulant med) and also help your body and brain fight and heal itself from continuous stimulant use. Unfortunately supplements are rarely if ever recommended to people taking ADHD medication. This is something I hope to change. The combo of medication/supplements I take has thankfully changed my life for the better, and I have graduated with a BA in Psychology, and am now entering grad school to become an MFT Psychologist and hope to help out tons of others out there struggling, like I was.
Here are the ones I HIGHLY recommend
(flaxseed oil, magnesium, coq10, melatonin, tyrosine, tryptophan, multivitamin with Antioxidants)
Here is everything I take, what it does, and why I take it
And here is a very helpful supplement website for people with ADHD, the guy who runs it has Inattentive ADHD like myself.
Hope this helps, best regards.