Zolpidem and Driving — a Dangerous Mix
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Fall/Winter 2009 Vol. 21, Issue 3/4 Willamette River, Salem, Oregon Zolpidem and Driving — A Dangerous Mix Chuck Hayes, Regional Operations Coordinator Drug Evaluation and Classification Program International Association of Chiefs of Police (IACP) here are numerous indicators that show pre- ilar four-year period.(1) In 2006, the last year for which Tscription drug abuse is a significant problem in data are available, drug-induced deaths exceeded the United States. According to the National Survey firearm-injury deaths and ranked second only to mo- on Drug Use and Health (NSDUH), conducted by tor vehicle crashes as a cause of death.(2) the Substance Abuse and Mental Health Services The increase in prescription drug abuse is Administration (SAMHSA), in 2006 approximately also having its effects on our nation’s road- 7 million persons 12 and older took a psychothera- ways. On July 13, 2009, the U.S. Department of peutic drug for non-medical purposes in the 30 days Transportation’s National Highway Traffic Safety prior to the survey. Young adults (ages 18-25) by far Administration (NHTSA) released a report on the showed the greatest use overall and the largest in- 2007 National Roadside Survey on Alcohol and creases in past month, past year, and lifetime use Drug Use by Drivers.(3) In a random sample of between 2002 and 2006, compared to all other age weekend nighttime drivers across the contiguous groups (NSDUH, 2007). 48 states, researchers found that 16.3 percent of At the same time, prescription drug abuse has be- the drivers tested positive for drugs, compared to come a serious threat to public health and safety, 2.2 percent of drivers with blood alcohol concen- with unintentional deaths involving prescription opi- trations (BAC) at or above 0.08 g/dL. This was the oids increasing 114 percent from 2001 to 2005, and first national study of roadside testing for drugs treatment admissions increasing 74 percent in a sim- in addition to alcohol. The study found that drugs continued on page 2 Article of Interest.......................................................................4 South Dakota’s 24/7 Sobriety Program ...................................5 The Dangers Associated with Smoking Oxycontin .................8 Five-Year Update on the Occurrence of Alcohol and Other Drugs in Blood Samples from Drivers Killed in Road-Traffic Crashes in Sweden ...........................................12 IPTM Alcohol and Drug Impaired Driving Symposium..........13 continued from page 1 were present more than seven times as frequently tion. The test subjects drove a designated dis- as alcohol of those surveyed. tance at a constant speed. A standard deviation of lateral position (drift) was the primary perfor- Law enforcement officers, prosecutors and toxi- mance parameter. According to the findings, a cologists are also encountering an increase in 10 mg dose of zolpidem had a small effect while impaired driving cases involving a variety of pre- 20 mg significantly impaired driving. (J. Clin. scription drugs. One drug from the CNS depres- Psychopharmacol, 2002;22:576-83) sant category having an impact on roadway safety is zolpidem, brand name Ambien®. The presence Zolpidem is a white to off-white crystalline powder. of zolpidem became such a concern that impaired It is available by prescription only and is a Schedule driving cases were studied in several states. IV controlled substance. Ambien® is available in (Washington: Zolpidem and Driving Impairment, strengths of 5 mg and 10 mg (white and pink oval 2001, by Logan and Couper; and Wisconsin: tablets, respectively). Sonata® contains zaleplon. Ambien — Drives Like a Dream? Case Studies Imovane® and Lunesta® contain zopiclone. Zolpidem of Zolpidem Impaired Drivers in Wisconsin, by and the other sleep drugs are a non-benzodiaze- Liddicoat and Harding). pine sedative-hypnotic, CNS depressant, sleep aid. Zolpidem is used in short-term treatment of insom- In the Washington study, state toxicologists at nia. Zaleplon and zopiclone also are prescribed for the Washington State Patrol’s Bureau of Forensic the treatment of insomnia.(5) Laboratory Services identified 29 impaired cases between January 1997 and December 1999 in The recommended zolpidem dose is 10 mg im- which zolpidem was identified in the subjects’ mediately before bedtime (5 mg in the elderly). blood. In five of the cases, zolpidem was the Recommended nighttime zaleplon and zopiclone only drug identified in the blood samples. The doses are 5-20 mg and 7.5 mg, respectively. researchers concluded that it was reasonable to Patients treated with zolpidem often use other conclude that zolpidem has the potential to affect medications such as antidepressants, narcotic driving in a negative way.(4) analgesics, and muscle relaxants, which can cre- ate additional problems if not used carefully. The effect of zolpidem on driving ability was also examined, in part, in a double-blind, placebo-con- Zolpidem goes by many different brand names trolled, crossover study of 16 healthy volunteers in the U.S. and abroad, including Ambien, (mean age 24.5 years). In the study a 10-mg dose Zolpimist, Adormix, Ambien CR, Edluar, Damixan, of zolpidem was given at 11 p.m. The next morn- Hypnogen, Myslee, Nytamel, Sanval, Stilnoct, ing, one groupDRE of subjects was assessed in a driv- Stilnox CR, Sucedal, Zoldem, Zolnod and ing simulator at 9 a.m. and another group at 11 Zolpihexal. (Wikipedia) a.m.; however, according to the researchers, zol- Zolpidem and other similar sleep drugs act on pidem had no effect on driving ability at either time the GABA receptor, leading to central nervous tested. (Psychopharmacology 1999;143:373-9) A system (CNS) depression. For this reason, users In another study with different results, investiga- are cautioned to avoid operating heavy machinery tors tried to determine the effect of middle-of-the- or automobiles following zolpidem administration. night administration of zolpidem on driving ability. Driving impairment caused by zolpidem is simi- Thirty volunteers participated in a double-blind lar to that of ethanol and other CNS depressants, study to measure the effects of zolpidem (10 or with adverse effects on vision, speech, balance 20 mg) or a placebo four hours after administra- and coordination. Notable symptoms of zolpidem continued on page 3 Page 2 continued from page 2 impairment may include a glassy stare, extreme- In 27 of the 28 cases, blood samples were drawn and ly poor balance with noted sway, disorientation, analyzed for the presence of drugs. In each case, the slow and raspy speech, and memory impairment. only drug detected was zolpidem. The zolpidem con- The manufacturer of zolpidem states that patients centrations ranged from 0.05 to 0.69 mg/L with a mean should be cautioned against engaging in hazard- of 0.22 mg/L. In one case, a zolpidem prescribed vol- ous occupations requiring complete mental alert- unteer was examined by DREs for training purposes ness or motor coordination such as driving a mo- and no toxicology was obtained. None of the 28 cases tor vehicle. involved the use of alcohol and in each case where a blood sample was obtained tests were negative for To determine what effects might actually be ob- drugs other than zolpidem. served in persons arrested for impaired driving associated with zolpidem, 28 actual impaired driv- Overview of the ing cases involving the use of zolpidem were re- 28 Case Zolpidem Study viewed using drug influence evaluation reports by The following chart represents information collected drug recognition experts (DREs). The cases were from the 28 actual zolpidem cases where the drivers examined to determine (1) the cause of the stop were evaluated by a drug recognition expert (DRE). and arrest, (2) performance on the psychophysi- The information includes the cause of the stop/arrest, cal tests administered during the DRE evaluation, the suspect’s performance on the psychophysical tests (3) results of the eye examinations, including hori- administered during the DRE evaluation; results of the zontal gaze nystagmus (HGN), vertical gaze nys- eye examinations, including horizontal gaze nystag- tagmus (VGN), lack of convergence (LOC), and mus (HGN), vertical gaze nystagmus (VGN), lack of (4) vital signs including pulse rate, blood pres- convergence (LOC); the suspect’s vital signs including sure, and body temperature. pulse rate; blood pressure, and body temperature. continued on page 4 Page 3 continued from page 3 Conclusion ARTICLE of INTEREST Zolpidem and other similar hypnotics act as sleep inducers. The known and well-documented relation- Abuse of prescription ship between fatigue, sleepiness, and driving perfor- drugs among youths mance make zolpidem and other similar hypnotics on the rise potentially hazardous when used in close proximity New research suggests that, though illegal to operating a motor vehicle. Based upon past stud- drug use is declining among children and ies addressing zolpidem and driving, and using the young adults, they are abusing prescription information collected from actual zolpidem impaired drugs, especially pain relievers, at an increas- driving cases, it is reasonable to conclude that nor- ing rate. Commonly abused prescription drugs mal prescribed doses of zolpidem and similar hyp- include codeine, methadone, oxycodone, and notics can adversely affect driving. It is also reason- Ritalin. The analysis of data from the National able to conclude that when law enforcement officers Household Survey on drug Abuse found that encounter persons suspected of driving under the almost 3 million adolescents and about 7 mil- influence of zolpidem and similar hypnotics they may lion young adults from ages 18 to 25 had used see a variety of impairment indicators that may or prescription drugs for non-medical purposes at least once in their lives. Researchers also may not follow the “classic” or traditional CNS de- found that pain relievers are among the most pressant signs and symptoms; however, some of the abused prescription drugs, while use of stimu- common indicators appear to be HGN, with an early lants and tranquilizers were also rising.