225 ILCS 85/23
It is unlawful for a pharmacist or pharmacy to pay or promise to pay to any person who owns, operates, manages or is an employee of a hospital, nursing home or other health care facility or to any person authorized by law to prescribe drugs or to any entity in which a person authorized by law to prescribe drugs holds an interest, any rebate, refund, discount, commission or other valuable consideration for, on account of, or based upon income received or resulting from the sale or furnishing by any such pharmacy of drugs or devices, prescriptions or any other service to patients of the above specified persons, organizations or facilities.
This shall not be deemed to include rent or other remunerations paid to an individual, partnership, or corporation by a pharmacist or pharmacy for the lease, rental, or use of space, owned or controlled, by the individual, partnership or corporation.
225 ILCS 85/23