Medicating a soon to be Audhd 5 year old boy.

first and foremost I am not against medication. I take ADHD medication because it helps me. my questions are more about experience and info if you have it.

my son was diagnosed with ASD(level 2) and ADHD when he was 4.5 years old. He is very impulsive, he has melt downs where he hits, throws and pushing things over. they don't last long but they happen. especially when a demand is placed, and especially when the demand isn't something preferred.

we are in ABA, we started in January.

but I've noticed and uptick in in melt down behavior, almost as if he can't control it. So I started looking up medicine.

I've now read so many conflicting articles. so say medicate right away. some say at his age so wait, do ABA for 6 months then medicate. so articles say kids under the age of 6 can't metabolize the meds so they don't work well.

I also read on here all the stories or aggression, hallucinations,not sleeping...ect and that stresses me out more.

is there anyone with experience of an ASD/ADHD 5 year old boy that took meds? did it help with impulses or melt down behavior?