Ohio Revised Code Title XXI. Courts Probate Juvenile § 2135.12

(A) A declaration executed in accordance with this chapter shall not supersede a valid declaration governing the use or continuation, or the withholding or withdrawal, of life-sustaining treatment executed under Chapter 2133. of the Revised Code.

(B) A declaration executed in accordance with this chapter does not revoke a valid durable power of attorney for health care created under Chapter 1337. of the Revised Code, but a declaration so executed shall supersede the designation of an attorney in fact made in a valid health care power of attorney under Chapter 1337. of the Revised Code with respect to the mental health treatment of the declarant. The designation of an attorney in fact in a valid health care power of attorney under Chapter 1337. of the Revised Code shall remain effective in all other respects.