Ohio Rev. Code § 3719.16
No person shall dispense or sell, under the exemptions of section 3719.15 of the Revised Code to any one person, or for the use of any one person or animal, any preparation included within such section, when he knows, or can by reasonable diligence ascertain, that such dispensing or selling will provide the person to whom or for whose use, or the owner of the animal for the use of which, such preparation is dispensed or sold, within any forty-eight consecutive hours, with more than two grains of opium, or more than one-half of a grain of morphine or any of its salts, or more than four grains of codeine or any of its salts, or more than two grains of dihydrocodeine or any of its salts, or more than one-half grain of ethylmorphine or any of its salts, or will provide such person or the owner of such animal, within forty-eight consecutive hours, with more than one preparation exempted by the provisions of section 3719.15 of the Revised Code.
No person shall obtain or attempt to obtain, under the exemptions of section 3719.15 of the Revised Code, more than one preparation exempted by the provisions of that section within forty-eight consecutive hours.
R.C. §3719.16