Jeffrey Salazar
False-positive results from drug tests can happen due to a variety of factors, including specific medications, supplements, and foods. Many prescription and over-the-counter medications contain compounds that interfere with drug testing technologies, especially immunoassay-based screenings. Common medications known to cause false positives include pseudoephedrine, bupropion, ibuprofen, ranitidine, and sertraline. Diet pills, in particular, may contain banned stimulants or compounds that mimic amphetamines, leading to a false positive result. Additionally, supplements like CBD oils and hemp-based products can test positive for THC due to trace amounts of this substance. Even everyday foods like poppy seeds, tonic water, and coca tea can trigger false positives. Therefore, it is crucial to understand the potential impact of these substances on drug test results and take necessary precautions to avoid inaccurate conclusions.
| Characteristics | Values |
|---|---|
| Diet pills | Weight-loss pills may contain banned stimulants or compounds that mimic amphetamines |
| Prescription medications | Antidepressants, decongestants, dextromethorphan, proton pump inhibitors, quinolone antibiotics, selective serotonin reuptake inhibitors, serotonin and norepinephrine reuptake inhibitors, atypical antipsychotics, antihistamines, sleep aids, doxylamine |
| Over-the-counter medications | Ibuprofen, pseudoephedrine, bupropion, trazodone, diphenhydramine, Benadryl, Robitussin, Delsym, Unisom |
| Supplements | CBD oils, hemp-based items, workout enhancers, poppy seeds |
| Foods and drinks | Tonic water, hemp seeds, coca tea, poppy seed bagels, pizza, cocaine metabolites |
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What You'll Learn
Poppy seeds in food can cause false positives
Poppy seeds come from the Papaver somniferum poppy plant species, whose name in Latin hints at its sleep-inducing properties. While poppy seeds themselves don't contain opiates, consuming certain poppy seed food products can lead to positive urine test results for opiates, specifically morphine and codeine. This is because poppy seeds contain low levels of opiates, and drug tests are highly sensitive.
In most cases, opiate concentrations in the urine are too low to produce a positive test result. However, certain food products—which ones specifically is generally impossible to know because opiate content is not listed on food labels—contain enough opiates to produce positive test results. This can lead to challenges in distinguishing between poppy seed consumption and opiate administration.
In fact, the U.S. Defense Department issued a memo on February 17, 2023, warning service members to avoid eating poppy seeds because doing so may result in a positive urine test for the opiate codeine. This is a serious issue, as service members who test positive for codeine and claim that it was due to poppy seed consumption are still regarded as having taken codeine and may face disciplinary action or discharge from the service.
Therefore, it is recommended that individuals avoid consuming poppy seeds for a few days before a scheduled drug test. However, it is important to note that the research in this area has focused on large quantities of poppy seeds, so it is unclear if smaller amounts will cause a false positive.
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CBD products may contain THC
While CBD itself will not cause a false positive drug test, CBD products may contain THC, which can show up on a urine drug test. THC is the psychoactive ingredient in marijuana that produces the "high" feeling. Hemp is any part of a cannabis plant that contains 0.3% THC or less. CBD products derived from hemp could have small amounts of THC in them even if it is not listed on the label. This means that people who use CBD regularly could build up high enough THC levels in their bodies to test positive.
In addition, reports have shown that some CBD products contain varying amounts of THC, some so high that they cannot be explained by legal amounts of hemp. Therefore, it is important for patients who are thinking about taking CBD products to talk to their healthcare providers first. Furthermore, CBD can also change the way some medicines work, so it is important to consult a doctor before using CBD products, especially if you are taking other medications.
It is worth noting that drug tests can be affected by medications, foods, and other factors, leading to false-positive results. For example, antidepressants, decongestants, and dextromethorphan are examples of medications that can cause false positives. Even certain foods, such as poppy seeds, can lead to false positives for codeine or morphine on a urine drug test. Therefore, it is important to be aware of the potential for false positives and to consult with a healthcare professional if there are concerns about drug test results.
Overall, while CBD products may contain THC, it is important to understand the potential risks and to seek appropriate medical advice before consuming CBD or undergoing drug testing.
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Antidepressants and antihistamines may cause false positives
Antidepressants and antihistamines have been known to cause false positives in drug tests. False positives occur when a drug test shows the presence of a medication or substance that hasn't actually been consumed. This can be due to laboratory errors or the result of chemical cross-reactivity between the drugs and the antibodies used in the immunoassay tests. Immunoassay tests are commonly used due to their inexpensiveness and quick results, but they are not fail-safe testing methods.
Antidepressants such as bupropion (Wellbutrin), fluoxetine (Prozac), trazodone (Desyrel), sertraline (Zoloft), venlafaxine, and desvenlafaxine (Pristiq) can cause false positives for LSD, benzodiazepines, opioids, and amphetamines. Antidepressants like sertraline (Zoloft) can also cause a false positive for marijuana (THC) due to the presence of dextromethorphan, a common ingredient in over-the-counter cough suppressants.
Antihistamines like diphenhydramine (Benadryl) can cause false positives for methadone, opioids, or PCP. This is because diphenhydramine belongs to the amino compound category, which has structural similarities to some drugs in the narcotic group.
If you are concerned about a false positive on a drug test, it is important to consult a healthcare professional. They may be able to run a second, more specific test, such as chromatography or GC-MS, which is highly accurate in identifying and quantifying drug substances. It is also recommended to inform the laboratory ahead of time about any medications, supplements, or foods that could potentially affect the test results.
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Dietary supplements may cause false positives
False-positive results can occur for a variety of reasons, including the presence of certain medications, foods, dietary supplements, and medical conditions that interfere with test results. It is important to note that these substances and conditions do not indicate the presence of illegal drugs, but they may inaccurately appear as such on drug tests.
Dietary supplements, in particular, have been known to cause false positives during drug tests. Biotin, commonly found in nutritional supplements and multivitamins, is one such example. It can cause clinically significant inaccurate lab test findings, leading to incorrect diagnoses and potential clinical consequences. Air Force reservists, for instance, have been advised to exercise caution when taking dietary supplements to avoid potential health risks and positive urinalysis test results.
Additionally, certain medications can trigger false positives. Antidepressants, decongestants, and dextromethorphan (found in cough suppressants like Robitussin and Delsym) are examples of substances that can cause false positives for opioids. Other medications like venlafaxine, desvenlafaxine, and trazodone may lead to false positives for amphetamines or methamphetamines. It is worth noting that even common over-the-counter medications like ibuprofen and naproxen can cause false positives for barbiturates or THC.
Furthermore, it's not just medications and supplements that can cause false positives. Certain foods, such as poppy seeds, can lead to a false positive for codeine or morphine on a urine drug test. Hemp and CBD products may also contain trace amounts of THC, which can be detected in urine tests and build up over time.
To avoid potential false positives, it is recommended to inform the laboratory or testing facility of any medications, supplements, or foods that could potentially impact the test results. Being proactive can help protect against false positives and ensure more accurate interpretations of drug test results.
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Over-the-counter medications may cause false positives
Some common over-the-counter medications that can cause false positives include:
- Ibuprofen (Advil, Motrin) – High doses can produce false positives for THC or PCP.
- Naproxen sodium (Aleve) – Can cause false positives for barbiturates and THC.
- Pseudoephedrine (Sudafed) – Found in cold medications, it can mimic amphetamines.
- Bupropion (Wellbutrin) – An antidepressant that can appear as amphetamine or methamphetamine.
- Dextromethorphan (Robitussin, Delsym) – The main ingredient in many over-the-counter cough suppressants, it can cause false positives for opioids.
- Doxylamine – Large doses of this sleep aid can cause false positives for opioids, specifically methadone.
- Diphenhydramine – May result in a false positive for PCP, although typical doses may not be an issue.
It's important to note that this is not an exhaustive list, and other over-the-counter medications may also cause false positives. Additionally, certain supplements, foods, and other factors can interfere with drug testing technologies. For example, CBD products, hemp, poppy seeds, and tonic water may trigger false positives for THC.
To reduce the chances of a false positive, it is recommended to disclose any medications, supplements, or health conditions before a drug screening. If you suspect a false positive result, you can request a retest or a more specific test and provide documentation of your prescriptions.
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Frequently asked questions
Diet pills are weight-loss pills that may contain banned stimulants or compounds that mimic amphetamines.
Yes, diet pills can cause a false positive on a drug test. This is because they may contain banned stimulants or compounds that mimic amphetamines.
Some examples of diet pills that can cause a false positive include phentermine, which can cause a false positive for amphetamines, and pseudoephedrine, found in cold medications, which can also mimic amphetamines.
To avoid a false positive on a drug test, it is recommended to disclose any medications and supplements you are taking before the test. It is also advised to avoid suspicious supplements or diet pills, especially unverified products, and to limit or avoid poppy seeds, hemp products, and tonic water for a few days prior.
Common causes of false positives on drug tests include certain antidepressants, decongestants, dextromethorphan (found in cough suppressants), CBD products, poppy seeds, and hemp products.
