Neurontin, or gabapentin is another drug that effects the GABA mechanism.
"Gabapentin is structurally related to the
neurotransmitter GABA (gamma-aminobutyric acid) but it does not modify GABAA or GABAB radioligand binding, it is not converted metabolically into GABA or a GABA
agonist, and it is not an inhibitor of GABA uptake or degradation."
Apparently the mode of action is, in effect, to increaase the amount of GABA in the brain as contrasted to Baclofen which is a GABAb agonist.
http://www.rxlist.com/cgi/generic/gabapent_cp.htm
Whether it also has effects on LH and FSH, as baclofen does, remains to be seen.