Ohio Rev. Code § 1333.20
Any person injured by any violation of sections 1333.11 to 1333.21, inclusive, of the Revised Code, or any trade association which is representative of such injured person, may maintain an action to prevent, restrain, or enjoin such violation. If in such action a violation is established, the court shall enjoin and restrain or otherwise prohibit such violation and in addition shall assess in favor of the plaintiff and against the defendant the costs of the suit. In such action it is not necessary that actual damages to the plaintiff be alleged or proved, but where alleged and proved the plaintiff in such action, in addition to such injunctive relief and costs of suit, may recover from the defendant the amount of actual damages sustained by the plaintiff.
In the event no injunctive relief is sought or required, any person injured by a violation of such sections may maintain an action for damages alone and the measure of damages in such action shall be the same as prescribed in this section.
R.C. §1333.20