can benadryl give you a false positive?
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Antihistamines and some sleep aids containing diphenhydramine (like Benadryl) could cause a false positive result for PCP or methadone. Doxylamine (the active ingredient in Unisom) can also trigger a positive drug result for methadone, opiates, and PCP.
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Benadryl is usually extremely safe, but if too much is given to your cat, it can cause lethargy or excitement. Occasionally, a cat may also develop dry mouth, have respiratory depression, seizures, go into a coma, or even die if a large enough amount is administered.
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Diphenhydramine (Benadryl) is an older antihistamine with known anticholinergic properties that can lead to several side effects, including xerostomia (dry mouth).
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Drugs that are typically screened for include amphetamines/methamphetamines, benzodiazepines, barbiturates, marijuana, cocaine, PCP, methadone, and opioids (narcotics). Research conducted at Boston Medical Center shows that drug tests produce false positives in 5% to 10% of cases.
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Many people turn to over-the-counter medicines when they need relief from allergy and cold symptoms or have trouble falling asleep. That's why you might be concerned about a new study showing that one of the most common of those drugs—Benadryl—could lead to serious health problems, including dementia.
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Lomotil does contain an opiate which can be detected in urine tests eight to 24 hours after taking it. It can show up as a false positive for Demerol, depending on how much you took. It will show up in hair follicle tests for 90 days and tests using saliva for one to two days.
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Seek urgent medical advice if you experience any symptoms such as agitation, hallucinations, a fast heart rate, dizziness, flushing, muscle tremor or rigidity, nausea, vomiting or diarrhea. Talk to your doctor or pharmacist before taking any other medications while you are taking diphenhydramine.
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Accuracy of Skin Prick Tests Positive tests, however, are not always accurate. About 50-60 percent of all SPTs yield “false positive” results, meaning that the test shows positive even though you are not really allergic to the food being tested.
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You can test positive even though you have not actively used a drug. It may bring a false positive after the ingestion of natural, harmless substances. These include food with yeast, cold medication, poppy seeds, ibuprofen, and antiretroviral drugs.
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If you don't follow the dollar store pregnancy test instructions precisely, then the chances are that you might end up with a false positive even though you are not pregnant. Hence, it is important to read the instructions carefully and follow them to the T to get accurate results.
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Drinking a lot of liquid before testing can leave you with a faint positive line, or if you're testing early, even a negative result. It may be easy to think a faint line is a false positive, but it's very, very rare to get a false positive result.
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A false-positive result indicates a pregnancy even though there isn't one. Rarely, the test may detect abnormal, non-pregnancy tissue, which requires follow-up by a doctor. These results are rare because usually only pregnant women produce the hCG hormone.
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Chemical pregnancy The most common explanation for a "false positive" is that you really were pregnant when you took the test. "Some women can get a positive pregnancy test and then three days after their period is due, they have a really heavy period," says Lanalee Araba Sam, M.D., an ob-gyn in Fort Lauderdale.
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Interactions between your drugs No interactions were found between Benadryl and prednisone. This does not necessarily mean no interactions exist. Always consult your healthcare provider.
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First-generation antihistamines like Benadryl not only block the effect of histamine, but as anticholinergics, they also block the effect of acetylcholine, a chemical in your brain that helps send messages between cells. Blocking acetylcholine can cause temporary drowsiness, confusion, and memory loss.
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Antibiotics. Most antibiotics have not been indicated to cause false-positives with UDS immunoassays; however, quinolones and rifampin have been documented in small studies.
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Taking Wellbutrin (bupropion) may cause a false positive for amphetamines in a routine drug test, so be sure to let the tester know you are taking the prescription.