What it caused with me was horrible lung problems. I have never had an instance of bronchitis or asthma in my life. Soon after I began taking it, I had four or five instances of bronchitis a year with several of them turning into pneumonia. One day last November, I was watching TV and one of those medical malpractice commercials came on..."have you ever taken these drugs?" To my shock Neurontin came up. I went to that lawyers website and they were asking for people with lung problems to contact them. I then did a simple search and found multiple instances of people with lung problems taking Neurontin. I was shocked. I stopped taking it that day and haven't had a problem since.