http://www.prescriptiondrug-info.com/threads/drug-testing-D66686_s2.htm Recent Posts About drug testing at The People's Medicine Community. does the antibotic KEFLEX interfere with the results of a drug test? en-us Copyright 2009 Prescription Drug Info All Rights Reserved. 11/22/2009 1:16:04 AM 20 http://www.PrescriptionDrug-Info.com/threads/drug-testing-D66686_s2.htm#148007 It shouldn't, though some meds will give a false positive, it is always best to tell the person or company ordering the testing, as well as the doctor or company who is taking the sample, everything you are taking, that way they know what to expect from the results. Sat, 16 Sep 2006 09:26:28 -0800