Can phenylephrine cause a false positive drug test?

The cough suppressant dextromethorphan may cause false-positive PCP1,2,4 and opioid levels due to its metabolite’s similarity to the opioid agonist levorphanol. Furthermore, decongestants phenylephrine and pseudoephedrine have shown false-positive amphetamine levels due to similar structures.

What medicine will make you test positive for methamphetamine?

Metformin (Glucophage) is the most commonly prescribed oral medication for diabetes. Taking metformin may result in a positive test for amphetamine or methamphetamine.

How long does phenylephrine stay in your system?

The elimination half life of phenylephrine is about 2.5 to 3.0 hours. The clinical effects of a single intravenous bolus dose of phenylephrine are short lived and needs to be repeated every 10–15 minutes.

How much riboflavin will cause a false positive?

The authors found that the accuracy of discrimination increased with riboflavin dose, and reached 100\% with measurement 2 to 8 hours after a 50 mg dose, although there was an average 21.2\% false positive rate.

What class of drug is phenylephrine?

Phenylephrine is in a class of medications called nasal decongestants. It works by reducing swelling of the blood vessels in the nasal passages.

Can riboflavin cause you to fail a drug test?

With large doses of riboflavin or multiple daily doses, a “spillover” effect has been observed, in that riboflavin can be detected in the urine for longer than 24 hours (Babiker et al., 1989; Cluss and Epstein, 1984).

What happens if my drug test is positive?

If the test results in a positive reading, meaning there is drug residue in the body, the results are forwarded to a medical review officer, who reviews the results and looks for any possible valid medical explanation for the results.

Is phenylephrine direct or indirect acting?

Phenylephrine is a noncatecholamine, direct-acting α receptor agonist that does not possess any significant β receptor activity.

What receptors does phenylephrine act?

The primary binding target of phenylephrine is the α-adrenergic receptor with the highest affinity for the α1-receptor. Phenylephrine is an α1 selective agonist but may affect β-receptors in high doses. It is equipotent to norepinephrine but has a slightly longer duration of action.

How likely is riboflavin false positive?

What medications can cause a false positive drug test for methamphetamines?

In addition a number of other medications and their metabolites can also cause false positive result for Methamphetamines they include; Metformin: Metformin (Glucophage) is the most commonly prescribed oral medication for diabetes. Taking metformin may result in a positive test for amphetamine or methamphetamine.

Can Ritalin cause a false positive on a drug test?

If you’re taking labetalol, you could have a false positive test for amphetamine, methamphetamine, or LSD. Methylphenidate: Used to treat ADHD, methylphenidate (Ritalin) is a well-known cause of false positive tests for amphetamine or methamphetamine, and LSD.

Can Sudafed cause a false positive on a drug test?

Pseudoephedrine: Used for sinus and nasal congestion, pseudoephedrine (Sudafed) can be the cause of false positive tests for amphetamine or methamphetamine. Labetalol: Labetalol (Trandate) is both an alpha- and beta-blocker drug used for blood pressure control.

Can OxyElite Pro cause a false positive for amphetamines?

A case report linked a false positive amphetamine screening to use of the weight-loss supplement Oxyelite Pro. 10 In addition, a review of drug screenings conducted by the Department of Defense showed that DMAA was associated in 124 cases out of 134 false-positive amphetamine samples.

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