The median lethal dose is the average dose of a toxin that could cause death for specific individuals, taking into account age, height, weight, and general health. The median toxicity dose under the same conditions is the amount of a toxin needed to make one ill.

50 mg

The 'median lethal dose'. In other words, the average dose that would be enough to kill you

Calculating the median lethal dose, LD50 (the dose of a toxin which kills half of the test population) first requires a lot of laboratory testing which can take months. The data is then accumulated and manipulated to give a value which is the median dose.

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Why don't you get to understand Lichfield wilcoxon's method.

enough of a drug, if you take a lethal dose, it will kill you.