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Can mucinex singulair or benadryl cause a false positive for amphetamine?

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Anonymous 24 Jun 2011


1.-Mucinex (children´s cough) contains dextromethorphan and Can Cause False Positive For Heroin, Opiates, Morphine.-

2.-Mucinex D contains guaifenesin and pseudoephedrine, this last one ( pseudoephedrine ) Can Cause False Positive For Amphetamines (speed).-

3.-Benadryl contains diphenhydramine - Can Cause False Positive PCP results.-

Take care,

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