It takes the same amount of time for the blood levels of a drug to fall from 100 mg/ml to 50 mg/ml as it does to fall from 2 mg/ml to 1 mg/ml.

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This statement is true according to the principles of pharmacokinetics, specifically the half-life of a drug. The half-life is the time it takes for the concentration of a drug in the bloodstream to decrease by 50%. Therefore, if it takes a certain amount of time for a drug to go from 100 mg/ml to 50 mg/ml, then it will take the same amount of time for it to go from 2 mg/ml to 1 mg/ml because both transitions represent a 50% decrease in concentration.

It Takes the Same Amount of Time for the Blood