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To be effective, a certain drug must not drop below 15 mg in the body. A 120

mgs of that drug was administered to a patient. How much time will it take for
that drug to reach the 15 mg minimum level. The drug's half-life is 30 minutes.

User Scherf
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1 Answer

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Thus, it follows that after 4 to 5 half-lives, the plasma concentrations of a given drug will be below a clinically relevant concentration and thus will be considered eliminated. Conversely, the accumulation of a drug can reach a steady-state during an infusion
User Justin Pihony
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