55. Drug Dosing Interval Let y(t) be the drug concentration (in micrograms per kilogram) in a patient's body at time t. The initial concentration is y(0) = L. Additional doses that increase the...

Extracted text: 55. Drug Dosing Interval Let y(t) be the drug concentration (in micrograms per kilogram) in a patient's body at time t. The initial concentration is y(0) = L. Additional doses that increase the concentra- tion by an amount d are administered at regular time intervals of length T. In between doses, y(t) decays exponentially-that is, y' = -ky. Find the value of T (in terms of k and d) for which the the concentration varies between L and L – d as in Figure 15. y (mcg/milliliter) Exponential decay L-d Dose administered 37 FIGURE 15 Drug concentration with periodic doses.