Okla. Stat. tit. 63, § 2550.4

A. A managed care plan that has a closed formulary or that requires prior authorization to obtain certain drugs shall approve or disapprove a provider’s or a covered person’s request for a nonformulary drug or a drug that requires prior authorization within twenty-four (24) hours of receipt of such request. B. If the managed care plan does not render a decision within twenty-four (24) hours, the provider or covered person shall be entitled to a seventy-two-hour supply of the drug. The managed care plan shall then approve or disapprove the request for a nonformulary drug or prior authorized drug within the additional seventy-two-hour period. C. Failure of the managed care plan to respond within the subsequently allowed seventy-two-hour period shall be deemed as approval of the request for the nonformulary drug or prior authorized drug; provided, however, the approval shall be subject to the terms of the managed care plan’s drug formulary; provided further, the purchase of the approved drug shall be at no additional cost to the covered person beyond what the covered person would otherwise pay for a prescription pursuant to the managed care plan. D. All providers and covered persons in a managed care plan shall be provided with a copy of the plan’s drug prior authorization process upon initial contracting or enrollment and at the time of enactment of any subsequent changes to the process.