Sold under the trade names Neurontin®, Nupentin®, or Gabarone®, gabapentin is an anticonvulsant drug used primarily for treatment of seizures, fibromyalgia, and chronic neuropathic pain. This internal standard is suitable for GC/MS or LC/MS testing or isotope dilution methods of gabapentin in forensic analysis, clinical toxicology, pain prescription monitoring, or urine drug testing.