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Caesium in the body has a biological half-life of about one to four months. Mercury (as methylmercury) in the body has a half-life of about 65 days. Lead in the blood has a half life of 28–36 days. [29] [30] Lead in bone has a biological half-life of about ten years. Cadmium in bone has a biological half-life of about 30 years.
The tables below contain a sample list of benzodiazepines and benzodiazepine analogs that are commonly prescribed, with their basic pharmacological characteristics, such as half-life and equivalent doses to other benzodiazepines, also listed, along with their trade names and primary uses.
Triazolam is usually used for short-term treatment of acute insomnia and circadian rhythm sleep disorders, including jet lag. It is an ideal benzodiazepine for this use because of its fast onset of action and short half-life. It puts a person to sleep for about 1.5 hours, allowing its user to avoid morning drowsiness.
The unchanged drug was 96% bound to plasma proteins. The blood-level decline of the parent drug was biphasic, with the short half-life ranging from 0.4 to 0.6 hours and the terminal half-life from 3.5 to 18.4 hours (mean 8.8 hours), depending on the study population and method of determination. [62]
Midazolam is a short-acting benzodiazepine in adults with an elimination half-life of 1.5–2.5 hours. [13] In the elderly, as well as young children and adolescents, the elimination half-life is longer. [44] [66] Midazolam is metabolised into an active metabolite alpha-hydroxymidazolam.
Remifentanil's short context-sensitive half-life makes it ideal for intense pain of short duration. As such, it has been used for analgesia in labor successfully; however, it is not as effective as epidural analgesia. [10] In combination with propofol, remifentanil is used for anesthesia of patients undergoing electroconvulsive therapy. [11]
[5] [6] Its elimination half-life is shorter in children compared to adults. [5] In another study, the elimination half-life of hydroxyzine in elderly adults was 29.3 hours. [7] One study found that the elimination half-life of hydroxyzine in adults was as short as 3 hours, but this may have just been due to methodological limitations. [54]
For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The converse of half-life (in exponential growth) is doubling time. The original term, half-life period, dating to Ernest Rutherford's discovery of the principle in 1907, was shortened to half-life in the early 1950s. [1]