It could be an allergic reaction to it. Check with your pharmacist or doctor. I was on it for years and all of a sudden my knees started swelling up. The doctor told me that it was the neurontin. I stopped taking it and the swelling went right away.if you have any itching or swelling near or in your mouth or throat, go to the er. Allergic reactions can be very dangerous so please check into it. Let us know what you find out. Hugs