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ranitidine zantac stomach acid medications, over the counter cold medications, non steroid nasal inhalers like Afrin, and vicks vapor inhaler can cause false positive for amphetamines.
I included an article about prescribed and over the counter medications which can cause false positive results.
with any screening positive test, you still need a MS/GC confirmatory test
if you are not using any amphetamines, then your confirmatory test will not be positive .
let me know if you have questions.