Many common prescription and over-the-counter medicines, along with certain foods, can cause false positives on urine drug tests, especially for amphetamines, opioids, and cannabis, by mimicking drug metabolites; key culprits include cold meds (pseudoephedrine, dextromethorphan), antidepressants (bupropion, sertraline), NSAIDs (ibuprofen, naproxen), and even poppy seeds or CBD products.
Medications that may cause false positives
A list of supposedly drug-test beating substances might include: vitamin C (ascorbic acid), fruit juices (cranberry, lemon, apple, vinegar, pickles, pickle juice, Hawaiian Punch, salted cold coffee, aspirin, herbal teas, pectin (a citrus product used in combination with kaolin to treat diarrhea), golden seal root, ...
Several common medications can lead to a false positive on a drug screen, including but not limited to: brompheniramine, bupropion, chlorpromazine, clomipramine, dextromethorphan, diphenhydramine, doxylamine, ibuprofen, naproxen, promethazine, quetiapine, quinolones (ofloxacin and gatifloxacin), ranitidine, sertraline, ...
Clinicians, labs, companies, and others who test for drugs are aware false positives can happen, which is why more specific confirmatory testing is typically ordered when urine screens show a positive result. It could even be a true positive with another explanation.
Stay Hydrated. Consuming a lot of water may also clean out your system that gets rid of any remaining drug deposits through urination. Drinking water often during the day is recommended. However, do not drink too much water shortly before the test, as your urine will then be too diluted, which can cause suspicion.”
A false-positive test result only happens less than 1% of the time, but when it does, it can make the following days or weeks confusing before you realize you're not actually pregnant. So what actually causes a false-positive test and how do you decrease the chances of it happening to you?
This means that it is very important for you to know about this medicine and take it exactly as directed.
Causes of False Positives
False positive drug tests are predominantly caused by over-the-counter (OTC) medications. These can include nasal decongestants, sleep aids, and common medications that contain compounds like amphetamines, opiates, and cannabinoids.
Both ibuprofen and naproxen have been documented to cause false-positive barbiturate4 and cannabinoid1-4 levels. In addition, ibuprofen can cause a false-positive PCP level. Consider minimizing the use of NSAIDs in high-risk patients and recommending acetaminophen instead.
Do not take any paracetamol or drugs containing paracetamol 72 hours prior to collection. Avoid seafood and red wine 72 hours prior to collection. 48 hours prior to collection of the specimen. Levodopa should be avoided for two weeks before collection.
While stress or dehydration won't create a false positive directly, they can affect urine concentration, which could skew the results.
A positive test result can drastically affect employment chances, but it's possible to dispute it if it's likely false. Taking the necessary precautions before a drug test helps produce accurate results, and knowing the steps to dispute a test result is crucial when receiving a false positive.
The test may not detect all illicit drugs. Most routine urine tests do not catch LSD (lysergic acid diethylamide), ketamine, ecstasy (3,4-methylenedioxymethamphetamine), inhalant, or anabolic steroid use. Use of these substances is very uncommon, but parents should be aware of this limitation.
A test result that indicates that a person has a specific disease or condition when the person actually does not have the disease or condition.
Tips for Responding to False Positives
If a patient did not fast before their blood test, the test may show high levels of blood sugar. The patient may be diagnosed with diabetes when they actually do not have the disease. This is a false positive. This can lead to unnecessary medical treatment.
High risk medications
Get facts about the most commonly misused and abused drugs.
Taking Care of Yourself at Home
Key Steps for a Successful Natural Detox
Can a Urine Drug Test Show How Much You Took? POC Urine tests do not measure drug quantity—only whether a substance is present above a set threshold. However, laboratory-based definitive tests provide precise concentration levels (how much of the drug is present in a urine sample).