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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.
In toxicology, the lethal dose (LD) is an indication of the lethal toxicity of a given substance or type of radiation.Because resistance varies from one individual to another, the "lethal dose" represents a dose (usually recorded as dose per kilogram of subject body weight) at which a given percentage of subjects will die.
TDI is generally written as a value of exposure (e.g. in milligrams) per kilogram (kg) body weight. [3] Both ADI and TDI are usually assessed based on animal experiments , and it is most often hundreds of times lower than the dose causing no observable adverse effect (NOAEL) in the most sensitive tested animal species.
recommended replacement for "μg" which may be confused with "mg" mdi metered dose inhaler m.d.u. more dicto utendus: to be used as directed mEq milliequivalent mg milligram mg/dL milligrams per deciliter MgSO4 magnesium sulfate: may be confused with "MSO4", spell out "magnesium sulfate" midi at midday min. minimum [or] minim [or] minutum
Acceptable daily intake or ADI is a measure of the amount of a specific substance (originally applied for a food additive, later also for a residue of a veterinary drug or pesticide) in food or drinking water that can be ingested (orally) daily over a lifetime without an appreciable health risk. [1]
The mice group treated with an equivalent dose of paracetamol showed a significant decrease of glutathione of 35% (p<0.01 vs untreated control group). The oral LD50 was found to be greater than 2000 mg kg-1, whereas the intraperitoneal LD50 was 1900 mg kg-1. These results taken together with the good hydrolysis and bioavailability data show ...
For the drugs administered by oral and dermal route, the units of threshold dose are mg/kg body-weight/day (dose of the drug in mg per body weight in kg per day) or ppm (parts per million), while the threshold dose of drugs by inhalation delivery has the unit of mg/L 6h/day (amount of drug in mg in 1L of air, for 6 hours per day). [8]
In 1981, a paper by Gosselin estimated that the lethal dose is between 50 and 500 mg/kg. Doses as high as 15–20 mg/kg are taken by some recreational users. A single case study suggests that the antidote to dextromethorphan overdose is naloxone, administered intravenously. [17]