How long does it take to get Singulair out of one's system??? My girls (4 and 3) and I have been taking it for about the last 4-6 months. We stopped taking it two days ago. I still have puffy face and under eyes...they seem to be a little better, except sneezing all the time now immediately after stopping the Singulair. Uhg...hope we can get it out of our systems soon...any info. is appreciated!