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Trazodone, sold under many brand names, [1] is an antidepressant medication, [20] used to treat major depressive disorder, anxiety disorders, and insomnia. [20] It is a phenylpiperazine compound of the serotonin antagonist and reuptake inhibitor (SARI) class.
In toxicology, the median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 is a toxic unit that measures the lethal dose of a given substance. [1] The value of LD 50 for a substance is the dose required to kill half the members of a tested population after a specified test duration.
The median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 (lethal concentration and time) of a toxin, radiation, or pathogen is the dose required to kill half the members of a tested population after a specified test duration.
It is desirous for the value of LD 50 to be as large as possible, to decrease risk of lethal effects and increase the therapeutic window. In the above formula, TI safety increases as the difference between LD 50 and ED 50 increases—hence, a higher safety-based therapeutic index indicates a larger therapeutic window, and vice versa.
The protective index is similar to the therapeutic index, but concerns toxicity (TD 50) rather than lethality (LD 50); thus, the protective index is a smaller ratio. Toxicity can take many forms, as drugs typically have multiple side effects of varying severity, so a specific criterion of toxicity must be specified for the protective index to ...
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The median effective dose is the dose that produces a quantal effect (all or nothing) in 50% of the population that takes it (median referring to the 50% population base). [6] It is also sometimes abbreviated as the ED 50, meaning "effective dose for 50% of the population". The ED50 is commonly used as a measure of the reasonable expectancy of ...
He entered the Spanish Mission-style facility, located 60 miles north of Los Angeles, under the wrenching spell of heroin withdrawal. In the room Peterson shared with 50 other patients, he was the only drug addict. Not once did a doctor treat him, a nurse attend to him or a psychiatrist hear his story.