Use of Niacin in Attempts to Defeat Urine Drug Testing — Five States, January–September 2006
In addition to its use as a nutritional supplement, niacin (nicotinic acid or vitamin B3) is medically prescribed to treat hyperlipidemia and hypercholesterolemia. Use of niacin in low doses usually leads to few adverse drug reactions (ADRs); however, at larger doses, niacin can cause skin flushing, itching, and occasionally more serious effects ( 1 ). The 2005 annual report of the American Association of Poison Control Centers documented 3,109 reports of exposures to niacin ( 2 ). During 2006, the Rocky Mountain Poison and Drug Center (RMPDC) in Denver, Colorado, received multiple calls regarding ADRs after nonmedical use of niacin. A review of call records indicated various uses of niacin, including attempts to alter or mask results of urine drug tests, although no scientific evidence exists that ingestion of niacin can alter a drug test result. To determine the extent of niacin use in attempts to alter drug test results, reports to RMPDC of niacin ADRs were reviewed for the period January–September 2006. The results identified 18 persons who reported nonsuicidal, intentional, nonmedical reasons for using niacin, including eight who specified altering drug test results as their reason for using niacin. Ten other persons, among an additional 18 who offered no reason for niacin use, were categorized as possible users of niacin to try to alter drug test results because of their ages or the amount of niacin ingested. Clinicians, especially those whose patients include teens and young adults, should be aware of the potential use of niacin in attempts to defeat urine drug tests.
RMPDC serves Colorado, Hawaii, Idaho, Montana, and southern Nevada, a total population of approximately 10 million. RMPDC staff members searched their database for telephone calls reporting niacin exposures during January–September 2006. Calls regarding niacin exposures were divided into six categories: 1) unintentional dosing errors in therapeutic users, 2) ADRs after therapeutic use, 3) pediatric unintentional exposures, 4) suicide attempts, 5) ADRs with no reason given for niacin use, and 6) ADRs after nonsuicidal, intentional, nonmedical use. Data collected included the person’s age, sex, circumstances of exposure, symptoms, and outcome. Persons who gave no reason for niacin use but were aged excluding three adults of unknown ages, was 18 years (range: 15–50 years). Eight of the 18 persons said they took niacin (1,000 mg–8,000 mg) to alter or mask a drug screening; eight others said they took niacin (400 mg–5,000 mg) to “purify, cleanse, or flush” their bodies; and two said they used niacin as a diet pill. Among the 18 persons who gave no reason for niacin use, eight were aged Reported by: C Mendoza, MD, K Heard, MD, Rocky Mountain Poison and Drug Center, Denver Health Medical Center, Colorado.
Niacin is well established as a medical treatment for hyperlipidemia ( 3 ) and available by prescription in 50-mg to 500-mg tablets or capsules. The initial recommended therapeutic daily dose is 100 mg, three times a day, titrated to a maximum daily dose of 1,000 mg ( 4 ). Extended-release niacin tablets and capsules (at 125 mg–1,000 mg) also are available by prescription, usually in a dose of 500 mg at bedtime, to a maximum of 2,000 mg per day. The therapeutic use of niacin often is limited by dermatologic and gastrointestinal ADRs (e.g., tachycardia, flushing, rash, nausea, vomiting, or abdominal pain). These effects usually are self-limited and are more common with dosages >1,000 mg per day, but can occur at any dose. Hepatotoxicity is a rare but serious adverse effect, usually associated with chronic use ( 5 ).
No scientific evidence indicates that taking niacin can alter a urine drug test result. However, readily accessible information on the Internet lists ingestion of niacin as a way to prevent detection of tetrahydracannabinol (THC), the main psychoactive ingredient of marijuana. An Internet search on the words “niacin” and “marijuana” can produce tens of thousands of results.
In addition to sales as a prescription drug, niacin is sold over the counter (in 100-mg to 500-mg tablets) and generally is regarded as a safe nutritional supplement with well-known dermatologic and gastrointestinal ADRs that usually are self-limited and resolve with supportive care ( 1 ). Death from acute overdose has not been reported, and a minimum lethal dose has not been established ( 6 ). However, severe effects in some patients have been reported. A report in press on use of niacin to defeat urine drug tests describes four cases of niacin toxicity that included hepatotoxicity, metabolic acidosis, variations in blood glucose, neutropenia, and electrocardiographic effects ( 7 ). Two of the four patients had life-threatening ADRs; one had taken 5,500 mg of niacin during a 36-hour period, and the other had taken 2,500 mg during a 48-hour period.
The findings in this report are subject to at least four limitations. First, the data were collected retrospectively from the RMPDC database; although a specific data set was gathered for each case, persons might have misrepresented the circumstances of their niacin use, leading to misclassification, underreporting of dosages, or inaccurate reporting of symptoms. Second, persons who did not cite a reason for using niacin and were aged 8 ) and should familiarize themselves with these effects and counsel their patients accordingly.
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- Mittal MK, Florin T, Perrone J, Delgado JH, Osterhoudt KC. Toxicity from the use of niacin to beat urine drug screening. Ann Emerg Med. In press. 2007.
- Cone EJ. Ephemeral profiles of prescription drug and formulation tampering: evolving pseudoscience on the Internet. Drug Alc Depend 2006;83S:S31–9.
Use of Niacin in Attempts to Defeat Urine Drug Testing — Five States, January–September 2006 In addition to its use as a nutritional supplement, niacin (nicotinic acid or vitamin B3) is