What are the ingredients in gabapentin, 100mg?

The active ingredient in Neurontin is gabapentin.

Neurontin (gabapentin) is an anti-epileptic medication, also called an anticonvulsant. It affects chemicals and nerves in the body that are involved in the cause of seizures and some types of pain.

Neurontin is used alone or in combination with other medications to treat seizures caused by epilepsy in adults and children who are at least 12 years old. Neurontin is also used with other medications to treat partial seizures in children who are 3 to 12 years old.

Neurontin is also used in adults to treat nerve pain caused by herpes virus or shingles (herpes zoster).

Exactly what is in it? ... it would be best to call the manufacturer and they will be able to give you more information about all other excipients used to make the pill.

https://www.drugs.com/neurontin.html