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Can over-the-counter cold medications cause false positives?

April 26, 2017cause cold False medications over-the-counter positives

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Can over-the-counter cold medications cause false positives?

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Here’s another reason why companies should only test with labs that guarantee the use of GC/MS confirmation. Some over-the-counter (OTC) medications can turn an initial screen for amphetamine positive because of the structural similarities between the various OTC drugs and amphetamine. However, these OTC drugs will not interfere with the GC/MS confirmation.