I am not experiencing any side effects from Gabapentin but am concerned about increasing in strength as it is excreted via the Kidney's. I only have one Kidney now as I had a Tumour, I had to have a left Nephroureterectomy last year for a TCC. I suffered for six months in pain and passing dark red blood in my urine, known as Haematuria. I am now heading towards 300mgs times a day. We do not have a very good health care service in the UK despite what you might hear.