All of the benzodiazepines are believed to have a similar mechanism of action although the exact mechanism has never been fully described. They are believed to work by affecting a specific brain chemical, a neurotransmitter known as gamma-aminobutyric acid, or GABA. Neurotransmitters are the messengers for the neurons in the brain and spinal cord, and responsible in one way or another for the vast majority of human behavior. GABA is an inhibitory neurotransmitter, meaning that it suppresses the functioning of the neurons in the brain and spinal cord.
Because many of the conditions that benzodiazepines address are believed to be associated with rapid-firing rates of neurons, such as seizures or anxiety, these medications offer viable medical treatments for some of these conditions. Even though they are all similar, the benzodiazepines will differ in:
There are numerous uses for benzodiazepines that include to treat anxiety, to reduce seizure activity, and to help individuals sleep. Benzodiazepines can also be used for:
There are numerous drugs in the benzodiazepine class. In general, benzodiazepines are interchangeable in their use, but some are more commonly used for specific types of conditions.
Benzodiazepines were hoped to be used as replacements for another class of drugs, the barbiturates, which was commonly used in the treatment of anxiety and seizures. Barbiturate abuse became a significant societal concern, and benzodiazepines were believed to have a lower potential for abuse than barbiturates.
However, all benzodiazepines are controlled substances (most often classified by the Drug Enforcement Administration as Schedule IV controlled substances), and all benzodiazepines have the potential for abuse. The Substance Abuse and Mental Health Services Administration (SAMHSA) reports that in 2016:
SAMHSA and other organizations report that benzodiazepines are not often primary drugs of abuse and are most often abused in conjunction with other drugs. The most common drugs used and abused with benzodiazepines include other benzodiazepines, opiates, alcohol, cannabis, and some stimulants.
The answer to this question is not as simple as it may seem. Different benzodiazepines have different durations of action and different half-lives even though they all are relatively similar. This means that some benzodiazepines will be eliminated from the body relatively quickly, whereas others may remain in the body for a longer period of time.
The above figures are general estimations, and there will be quite a bit of individual variability regarding the length of time any particular benzodiazepine remains in a person’s system. The type of detection test will also result in different detection times with blood testing having the shortest window of detection followed by urinalysis with an intermediate duration of detectability, and then hair follicle testing with the longest window of detectability.
Again, the length of time any benzodiazepine remains in the system is dependent upon its duration of action. For instance, in one study, Valium was detected in an individual’s system for a period of seven days, whereas Xanax was only detectable in the person’s system for 2.5 days.Long-acting benzodiazepines include Librium and Valium. Intermediate-acting benzodiazepines include Xanax, Ativan, Klonopin, and Restoril. Short-acting benzodiazepines include Halcion.
Certain metabolites that are produced when benzodiazepines are broken down in the body may be detectable in drug tests for significantly longer periods of time than the drug itself. This complicates the situation.
It should be noted that factors other than the properties of the drug itself can influence how long the drug remains in a person’s system. Since benzodiazepines are commonly abused with other drugs, this may result in the benzodiazepine being metabolized more slowly.
The classic example is taking benzodiazepines with alcohol. The liver, which is the organ that is primarily responsible for metabolizing most drugs, gives priority to metabolizing alcohol over all other substances. Alcohol is metabolized first at the rate of about one ounce of pure alcohol per hour. When the alcohol is metabolized, then the liver begins metabolizing other substances. Thus, individuals who mix different drugs may retain the drugs in their system for longer than they would normally.There are other factors that can affect the length of time drugs remain in the system.