A friend told me that for fairly serious joint pain and stiffness, take 400 mg. of Advil 4-5 times per day for five days. It works wonders. After that, don't take it for a while. I'm wondering if anybody knows anything about this? Also, does taking Advil in larger amounts like this negatively affect the body? How about tennis players who use Advil pretty regularly, especially after playing? Any long-term cumulative affects on the kidneys or any other part of the body? Thanks.