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Medically Reviewed. Benzodiazepines, a class of prescription medications known as sedatives or tranquilizers, depress the central nervous system to calm down people who have anxiety, insomnia, and certain phobias. These Schedule III medications are potent and should only be taken as prescribed, which is usually on a short-term basis. Physical side effects of benzodiazepines include slurred speech, sedation, motor impairment, disorientation, and behavior reminiscent of someone who is intoxicated after drinking alcohol. These medications are powerful drugs, and they should not be used in a carefree manner.


Benzodiazepines, which first entered the US pharmaceutical market in the early s, fall under the class of drugs referred to as sedative-hypnotics. It is not uncommon for physicians to prescribe both opioids and benzodiazepines for patients with chronic pain.

When used in conjunction with opioid pain medications, benzodiazepines have been shown to enhance pain relief, but the combination can be accompanied by increased risks for abuse and accidental overdose. By comparison, all other admissions to treatment centers decreased by 9. In Table 1 provides a list of generic and brand drug names, parent drug half-life information, and speed of onset for the commonly prescribed benzodiazepines.

Typically, with chronic use, both parent drug and metabolite should be present in the urine upon confirmation testing using a definitive analytical methodology such as mass spectrometry. Typical detection windows for benzodiazepines in the urine are 2 to 7 days, depending on the individual benzodiazepine drug used and other factors, such as time of last dose, drug half-life, route of administration, and individual differences in pharmacokinetics.

It is beneficial to document the date of the last dose taken by the patient when submitting the sample to aid in UDS interpretations. Genetic differences in metabolic pathways resulting in fast or slow metabolism also need to be considered when evaluating UDS. The flow chart in Figure 1 provides parent drug and metabolites that should be encountered during benzodiazepine metabolism.

Following administration, diazepam undergoes metabolism to yield the active metabolites nordiazepam and temazepam. Nordiazepam and temazepam are then further metabolized to the final active metabolic product oxazepam. Thus, the presence of nordiazepam, temazepam, and oxazepam together on a UDS is consistent with diazepam use.

Since clonazepam undergoes metabolism to produce the primary urinary metabolite of 7-aminoclonazepam, the presence of this metabolite is consistent with clonazepam use. Alprazolam is metabolized after administration to the primary urinary metabolite alpha-hydroxyalprazolam.


After administration, lorazepam undergoes glucuronidation to produce lorazepam-glucuronide. In a UDS, finding the parent drug lorazepam indicates recent use.

Common limitations exist for screening benzodiazepines when using traditional immunoassay IA tests. IA testing for benzodiazepines often targets nordiazepam and oxazepam to measure whether an antibody-antigen response occurs, resulting in a positive or negative test result.

Other benzodiazepine compounds are tested for their ability to cross react with the target drug in an IA technique. In other words, low cross-reactivity of other drugs can result in false negatives for the other benzodiazepines.

How long do benzodiazepines stay in your system – benzodiazepine detection time

The concentrations listed in Table 2 show the lowest levels that yield positive when using the DRI Benzodiazepine Assay. Some commonly prescribed drugs have limited cross-reactivity. For example, lorazepam and 7-aminoclonazepam, the primary metabolite of clonazepam, have limited cross-reactivity with traditional IAs due to their molecular structures.

Figure 2A and 2B illustrate an example of a patient who was prescribed lorazepam and clonazepam, respectively, and the of the testing.

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Due to the probability of obtaining a false negative with the initial IA test for lorazepam and clonazepam, it is important that these compounds be tested via MS for precise drug identification. As noted, in the 2 examples, there is an explanation of the test. Labs that specialize in this type of testing often will have comments to help the clinician interpret the .

Benzodiazepines are widely used both as prescription medications and recreationally as agents of misuse and abuse. Because of their widespread use and availability, it is important for clinicians to evaluate benzodiazepine use in their patients.

False-positive urine screening for benzodiazepines: an association with sertraline?

Using a UDS to help determine appropriate versus inappropriate use of these compounds will help providers offer better care to their patients. Interpretation of benzodiazepine UDS often is not straightforward due to the complexity of the metabolic pathways of these agents, particularly diazepam, and the potential for limited cross-reactivity of the IA resulting in false negatives lorazepam and clonazepam. Using a laboratory that understands this complexity will provide the necessary information to evaluate benzodiazepine use in your patients.

Types of Pain Acute Pain. Cancer Pain.

How long do benzos stay in your system?

Neuropathic Pain. Oral and Maxillofacial Pain. Rheumatologic and Myofascial Pain. Spine Pain. Other Types of Pain. Addiction Medicine. Complementary Treatments. Interventional Pain Management. Manipulation and Massage.

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What to know about drug testing for benzos – xanax & more

Pharmacodynamics of diazepam co-administered with methadone or buprenorphine under high dose conditions in opioid dependent patients. Drug Alcohol Depend.

Accessed January 25, Benzodiazepine use, abuse and dependence. J Clin Psychiatry.

Baselt R. Disposition of Toxic Drugs and Chemicals in Man. Opioid-Induced Constipation: Treatment Modalities. Recent PPM Issues. Volume 21, Issue 4.

How long do benzodiazepines stay in your system?

View issue. Volume 21, Issue 3. Volume 21, Issue 2. Types of Pain.

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The exact time a benzodiazepine drug may be detected for varies per drug.


This is a urine test to check for a type of medicine called benzodiazepine.