Recently after several beers and stopping an hour before bed I took a Claritin D 24 hour, I usually take it in the morning but was out and my wife had brought me some that night after getting off of work. The next morning at work I was pulled for a random drug screening, I failed the breathalyser with a .03 BAC after doing the calculations I should have been at a .00 for the numbers of hours (12) after my last drink. Could this have been cause by the late taking of the allergy pill blocking normal alcohol absorption.