Unyquity I AGREE, The Keflex was a poor choice on the orthodoxs part in the first place to fight a under nail infection. Had it been on it's game it would have chosen Lamisil. So I agree stop the darn Keflex its usless since the body does not recognize it as something it can use so it has sent it to your colon to reak havic on your intestinal flora. Sorry to have to tell you this but were all trying to help one another as best we can and get the info out there! JMRN