I had some routine blood tests run on Wednesday -- and they showed alarming numbers as to my kidney and liver functions. Doctor made me stop all NSAIDS and Tylenol -- and others -- and drink a gallon and a half of water Wednesday and Thursday. We redid the tests on Friday and the kidneys were great (dehydration) but the liver is still not fully recovered -- takes longer. I feel fine...had no idea. I was taking the maximum recommended dosage of 2 arthritis strength Tylenol every 8 hours. Turns out that can be deadly...especially if one is taking other meds that the liver metabolizes through the liver. I cannot take Tylenol for at least 3 months...cannot drink alcohol (the two together are dangerous), and can only use NSAIDS sparingly -- they are metabolized through the kidneys. So now, as I leave for a 3 week trip to Spain, Portugal, etc, I will have to live with arthritis ache in all my joints -- especially knees and spine. I am learning how to use ice and heat instead of taking pills. Learn from my mistakes...I am, even at this late stage!!