In my opinion, you must consult a homoeopathic physician for your son. Homoeopathy is an alternative system of medicine which works on the basis of similars. It considers various aspects of human personality to reach to a single & similar medicine. There is a great amount of emphasis on mind in Homoeopathy, as a result of which, an individual's personality, behaviour, nature, attitude towards life situations, etc are studies to great details.
In a condition like Asperger, where the child is greatly affected at the level of mind, Homoeopathy would be an apt mode of treatment along with the routine therapies. Be it the difficulty of social interaction, restrictive & repetitive behaviour, verbal or nonverbal communication; a homoeopathic prescription would consider each & every aspect of the child's personality & thus select the most appropriate medicine.
As for Intuniv 1 mg, you may continue with it, but be aware of the commonest side effects which include sleepiness, tiredness
& stomach pain. Make sure you take care of these conditions as & when they appear.
Looking forward to your response!!