it’s a stimulant so it could be increasing blood pressure and helping that way? for me i feel better on it but my crash afterwards is pretty bad

Have you had your thyroid checked?

For me it made my HR super high and with my POTS it was reaching 200bpm+ so I had to stop and move to a non stimulant. POTS is caused by many things as it is a syndrome, not a specific disease or anything. So possibly the ADHD meds are helping your postual/orthostatic tolerance somehow by “fixing” what ever was causing the POTS symptoms. I would simply keep an eye on it, if it’s not a problem then I wouldn’t worry much about it. Track your HR as you normally would, and note when you take the medication vs when you are not taking the medication. Like all stimulants, you should still limit usage as much as you can simply because they can become addictive and cause other issues, but just watch/track your BPM to look for any changes that are bad or good! Hope that helps!