I took these products for week and a half before i took a drug test. Sudafed was from behind counter and this was taken twice a day.
9 Mar 2012
Pseudoephedrine which is the active ingredient in Sudafed and other cold products (and now has to be bought from the pharmacy counter because it is a product they use in the production of methamphetamine and carries limits on the quantities that are bought) can sometimes cause a positive for methamphetamine on urine drug screens. A more sensitive test like GC-MS test can confirm a false positive. The more sensitive tests can detect the difference in pseudoephedrine and methamphetamine.
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