For the last few years, the non-opioid medication Gabapentin (branded as Neurontin and predecessor to schedule V drug Lyrica) has skyrocketed in opioid overdose toxicology reports. Schedules of Selected Drugs. SCHEDULE I (Indiana Code 35-48-2-4): (1) has high potential for abuse; and (2) has no accepted medical use in treatment in the United States or lacks accepted safety for use in treatment under medical supervision.