Gabapentin, also called Neurontin [1-(aminomethyl)cyclohexaneacetic acid] has many common undesirable side effects, which do in fact include gynecomastia in males and breast enlargement in females.
For nerve mediated pain, it is a very effective medication. For the bodybuilder using AAS, however, there are certain side effects that can overlap with Neurontin and may be exacerbated by their combined usage. Most notably changes in mood and behavior, especially enhanced aggression, have been described. If you tend to feel more aggressive/intolerant while on AAS I would suggest proceeding with caution.
