In our latest question and also answer, the pharmacist discusses even if it is or not Mucinex DM can reason a false-positive medicine screening.

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caddy asked

I took two Mucinex DM this morning without thinking and also i have a drug test on Thursday because that a brand-new job. Will certainly Mucinex present up and give me a false positive or will certainly I it is in okay?

At a glance

Mucinex DM has two energetic ingredients, among which (dextromethorphan) has been linked to bring about false-positives ~ above urinalysis medicine screenings because that opiates and PCP.



Mucinex DM contains two active ingredients:

Guaifenesin has not been connected to resulting in false-positives on medicine tests. Dextromethorphan, however, has been. Nevertheless, dextromethorphan causing a false-positive is assumed to be very uncommon and if the does occur, there room confirmatory exam available.

Dextromethorphan False-Positives

Dextromethorphan is an over the counter cough medication and a usual ingredient in various cough, cold and also flu products. The is beneficial in dealing with chronic, nonproductive coughs, but it has no expectorant activity.

Dextromethorphan is chemically related come opioid medications but does not exhibit your typical attributes such together analgesia and also respiratory depression.

Several studies, such as the one published by mei Clinic Proceedings, have noted dextromethorphan as being a possible agent responsible for causing false-positive results for:

Opiates (codeine and morphine)Phencyclidine (PCP)

Therefore, taking Mucinex DM before a urine drug screening has the possibility of bring about a "false-positive", back this would be thought about rare.

Why False-Positives Occur

Standard drug urinalysis tests are "immunoassay" tests. These occupational by making use of antibodies to react to details drug compounds.

When a specified drug is present in a check urine sample, an antibody binding to it, i m sorry produces a reaction. Once a reaction occurs, it is taped as a "positive" result.

Unfortunately, immunoassays are subject to false positives. Sometimes an antibody have the right to react with the wrong compound. That doesn"t happen often, however when that does, that can produce an unfortunate case for the individual gift tested.

If you believe a an outcome you obtained on a medicine test is incorrect, if possible, request the a more specific check be used to check or refute the outcomes you received.

See more: How To Find The Area Of A Regular Octagon With Apothem K And Side Of 10.

For example, gas or fluid chromatography through mass spectrometry deserve to be provided to determine the specific agent existing in a sample together they don"t rely on reactions through antibodies. While more expensive to use than your standard urinalysis test, they room far more accurate.