Ohio Rev. Code Ann. § 2925.36
(C)
(2) If the drug involved in the offense is a compound, mixture, preparation, or substance included in schedule I or II, with the exception of marihuana, the penalty for the offense shall be determined as follows:
(3) If the drug involved in the offense is a dangerous drug or a compound, mixture, preparation, or substance included in schedule III, IV, or V, or is marihuana, the penalty for the offense shall be determined as follows:
(D) In addition to any prison term authorized or required by division (C) or (E) of this section and sections 2929.13 and 2929.14 of the Revised Code and in addition to any other sanction imposed for the offense under this section or sections 2929.11 to 2929.18 of the Revised Code, the court that sentences an offender who is convicted of or pleads guilty to a violation of division (A) of this section shall do both of the following: