I've taken Greenstone (Pfizer) brand 300 mg generic capsules for several years with little or no side effects. They recently stopped production of this product. All the other generics gave me awful side effects (confusion, tinnitus, etc.). I even tried the Greenstone Gabapentin in tablet and liquid form with the same problem, which is odd because it's the same company. Can anyone recommend a brand of generic that has fewer side effects? I realize that everyone responds differently. Has anyone tried a variety of generic Gabapentin products? Thanks.