My mother aged 71 with bp, diabetes and pacemaker had a bad fall and fell on her knee & forehead. Both were swollen. The knee swelling is still there pains when standing and when touched. No fracture as per xray. The ortho gave zerodol sp twice a day. But my family doctor says zerodol will interfere with my mothers medicine and so not to take. It will damage kidneys. What is zerodol sp? Is it for bones or just a pain killer? please tell me.