755 ILCS 43/10: Declaration of preference or instructions.

(1) An adult of sound mind may make a declaration of preferences or instructions regarding mental health treatment. The preferences or instructions may include consent to or refusal of mental health treatment.

(2) A declaration for mental health treatment may be invoked within 3 years of its execution unless it is revoked. The authority of a named attorney-in-fact and any alternative attorney-in-fact named in the declaration continues in effect as long as the declaration appointing the attorney-in-fact is in effect or until the attorney-in-fact has withdrawn. If a declaration for mental health treatment has been invoked and is in effect at the expiration of 3 years after its execution, the declaration remains effective until the principal is no longer incapable.