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The elimination half-life is how long it takes for half of the drug to be eliminated by the body. "Time to peak" refers to when maximum levels of the drug in the blood occur after a given dose. "Time to peak" refers to when maximum levels of the drug in the blood occur after a given dose.
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.
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.
It has a relatively short elimination half-life, with the reported average value of 5 to 7 hours. [93] Because of its short elimination half-life, gabapentin must be administered 3 to 4 times per day to maintain therapeutic levels. [99] Gabapentin XR (brand name Gralise) is taken once a day. [100]
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]
The metabolic half-life is 8 to 59 hours (approximately 24 hours for opioid-tolerant people, and 55 hours for opioid-naive people), as opposed to a half-life of 1 to 5 hours for morphine. [12] The length of the half-life of methadone allows for the exhibition of respiratory depressant effects for an extended duration of time in opioid-naive people.
Clonazepam, sold under the brand name Klonopin among others, is a benzodiazepine medication used to prevent and treat anxiety disorders, seizures, bipolar mania, agitation associated with psychosis, obsessive–compulsive disorder (OCD), and akathisia. [11]
The half-life of desvenlafaxine is about 11 hours, and steady-state concentrations are achieved after 4 to 5 days. [58] The half-life of duloxetine is about 12 hours (range: 8–17 hours), and steady-state is achieved after about 3 days. [11] Milnacipran has a half-life of about 6 to 8 hours, and steady-state levels are reached within 36 to 48 ...