hmm, interesting.
ephedrine is available OTC, does pseudoephedrine also cause a positive for amphetamines?
never heard of this before. where are you getting this info, i couldn't find anything when i google'd
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edit----
ok, i'm dumb. found this:
"Dristan Nasal Spray, Neosynephren, Vicks Nasal Spray, Sudafed, etc. and others containing ephedrine or pnenypropanolamine. Over the counter appetite suppressants which contain propanolamine. Most common nasal decongestants can cause a positive reading for Amphetamines. As the cross reactive list suggests at the back of this booklet, amphetamine false positives are the most common. Recent articles in the Journal of Clinical Chemistry ,Vol. 38 No.12 1992 and Vol. 39 No.3 1993 warn that medications containing chloropromazine, fluspirilene, and others may yield a positive when tested for amphetamines."