Conversion from Transdermal Fentanyl to OxyContin Eighteen hours following the removal of the transdermal fentanyl patch, OxyContin treatment can be initiated. In case of respiratory depression, reversal agent such as naloxone hydrochloride may be utilized see OVERDOSAGE. That big reason why initial pain treatment may be so crucial, Dworkin said. Robbing pharmacies, frequenting doctor offices to get your pills fix, this is no way to live. 78 The slang term hillbilly heroin for OxyContin refers to the occurrence of the earliest reported cases of Oxycontin oxycodone de india abuse in the.