When a pharmaceutical drug is injected into the bloodstream, its concentration at time t can be approximate by C(t) = C₀e^-kt, where C0 is the concentration at t = 0. Suppose the drug is ineffective below a concentration C₁ and harmful above a concentration C₂.Then it can be shown that the drug should be given at intervals of time T, whereA certain drug is harmful at a concentration five times the concentration below which it is ineffective. At noon an injection of the drug results in a concentration of 2 mg per liter of blood. Three hours later the concentration is down to 1 mg per liter. How often should the drug be given?

Transcribed Image Text:

T = -In k C2 C₁