Hello, Thank you for contacting me at Ask a Doctor . I will try to answer your question to the best of my ability. I would suggest that you stop taking these tablets and see a primary care physician for a more thorough workup. You may need a urinalysis test and some plain x-rays of your knee if it is still painful. It is very difficult to give you specific clinical information at this time as I don t really have enough information to go on. I hope this information is useful for you. Please do not hesitate to message us back if you have any further questions. Best wishes, Adrian Rawlinson MD