What can cause false positive for methadone?

What can cause false positive for methadone?

Antihistamines, analgesics, cough suppressants, and heartburn medications have been shown to cause false-positives in studies and case reports. False-positive methadone levels have been documented with diphenhydramine 100 to 200 mg2-4,14 and doxylamine intoxication.

Does Effexor give false positive drug test?

False-positive urine immunoassay screening tests for phencyclidine (PCP) and amphetamine have been reported in patients taking venlafaxine. This is due to lack of specificity of the screening tests. False positive test results may be expected for several days following discontinuation of venlafaxine therapy.

Can a drug tests lead to a false positive?

A worry for anyone undergoing an illicit drug screen – whether it be a urine, hair, saliva or blood test – is the possibility of a false positive drug test. In fact, previous data suggests 5 to 10 percent of all drug tests may result in false positives and 10 to 15 percent may yield false negatives.

What medications can cause a false positive for Benzos?

A search of false positive benzodiazepine screenings showed the selective serotonin reuptake inhibitor (SSRI) sertraline (Zoloft, others) and the non-steroidal anti-inflammatory drug (NSAID) oxaprozin (Daypro, others) to be associated with, or possible causes of, these false-positive results.

Can naproxen cause a false positive for Benzos?

Some other medicines can cause a false positive result in benzodiazepine urine tests. These medicines include: Tolmetin. Naproxen.

Can I pass a drug test if I have a prescription?

If you test positive for a legal drug prescribed by your doctor, your employer can’t penalize you for a positive result, unless the drug is affecting your ability to perform your job.

Do I have to disclose my medications to my employer?

Under the ADA, an employer may ask a current employee about prescription medicine only when it’s job-related and consistent with business necessity. That means you may not ask all employees to disclose any medications they take. Remember that the ADA doesn’t permit employers to ask medical questions of job applicants.