Gabapentin was made a controlled substance in some states due to the increasing reports of misuse and abuse of the drug. Gabapentin is a prescription medication that is primarily used to treat seizures and nerve pain. However, it has also been found to have mood-stabilizing and sedative effects, which can be attractive to individuals seeking to abuse the drug.

Gabapentin was initially not classified as a controlled substance by the US Drug Enforcement Administration (DEA) because it was believed to have a low potential for abuse. However, as the drug became more widely prescribed, there were increasing reports of its misuse and abuse. In some cases, individuals would take high doses of gabapentin to achieve a euphoric effect, or they would combine it with other drugs to enhance its effects.

In response to these reports, some states have classified gabapentin as a Schedule V controlled substance, which means that it is subject to stricter regulations and monitoring. This is intended to help prevent the misuse and abuse of the drug and to ensure that it is used only for legitimate medical purposes.