A big risk is being cut off from a drug that works, but the dosage is wrong, just because the doctor doesn't understand how differently people react to these drugs. For me at least it has taken a long time to find out what dose works for me, how and when I should take it, because I've had to find out without professional support. GPs don't have enough understanding about the issue and complexity to actually give any advice or suggest options, and psychiatrists are really difficult to get to (especially ones that are specialized in neurodivergence).
I'm on Elvanse/Vyvanse and on a regular day I take 25mg, but if I leave home and know the day will be stressful I'll take 40-50mg (25-30mg in the morning and the rest in a few hours). But if I'm really overwhelmed it may be too little or way too much. The small dose helps significantly with my mood and impulsivity etc but there are some unpleasant side-effects as well as potential risks I wish would be addressed by the doctor - but then again I'll rather take this suboptimal solution than risk losing the prescription altogether, because at least this works somewhat.
My experience is that the psychiatrist initially prescribed me way too large doses even though I mentioned I'm sensitive to drugs, they just went on with the "regular titration plan", and I believe that intensified my burnout. Another thing in here is that they'll basically try 3 individual drugs (with maybe 3 different doses) and that's it. If there are any issues you'll easily get cut off the meds, there isn't much consideration for alternatives. You'll be lucky to try the actual ADHD meds, especially if you rely on public health care, as many are refused neurological evaluations and are stuck with SSRI's or similar.