My son has not been on any prescribe medication for autism relations. Although he could. Lol omg!
This past August I started him on CBD oil at bedtime. I've noticed a difference after increasing the dosage. CBD oil is not cheap, neither is ABA therapy.
But both help so far

I use Herbigold cbd oil and has helped greatly, here is the link
https://herbigold.com/?ref=Sue.bussell68

will do

I have been using the CBD oil and my grandson has just been prescribed guanfacine. Until I see how he reacts to the guanfacine, I am going to take him off the CBD oil. Please update as to what you end up doing because I may have to revisit the CBD as well

Name of brand-
beeZbee CBD
Name of the oil -
CBD Tincture Original
100 mg

At bed time I give my son 2 dosage.

A year before starting I read stories of autism families using cbd oil. I also did more on the medical use of MJ. Look led into my state and city requirements. Talked to people I personal know who either are receiving MJ treatment or child is.
Then it was a matter of where there find the oil near me.
Hope this helps.