410 ILCS 150/20
Providers are strongly encouraged to evaluate persons diagnosed with an autism spectrum disorder for co-occurring or otherwise diagnosed medical conditions when clinical symptomatology is present or suspected and prescribe appropriate treatments or services in alignment with care practices for the condition, illness, injury, disease, or disability. Providers may consider, without limitation, whether or not a medication or any ingredient, allergen, potential toxicant, or artificial agent may exacerbate clinical symptomatology of autism spectrum disorder or a related or co-occurring or otherwise diagnosed medical condition and, if so, may consider adopting measures that would result in the reduction or elimination of risk to the patient.
410 ILCS 150/20