Are Neurontin and xanax the same?
No, they are very different. Look up gabapentin on wikipedia.org for information on Neurontin (often used for neuropathic pain). Look up alprazolam on wikipedia.org for info on Xanax (often used for anxiety or inability to sleep)
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Additionally, gabapentin started life as an antiepileptic, but displays effective pain control properties on nueralgias, including nerve pain caused by Herpes sp. virus. Also used for treatment of multiple sclerosis and migraines, Neurontin or gabapentin is, as the first answer states, very different in pharmacology, pharmicokinetics and function from alprazolam.