<prompt> With IV infusion, a drug reaches 90 of its final steady state in 10 hours. The elimination half-life of the drug must be approximately1 h2 h3 h6 h  <response>: Time to reach 90 of final steady-state plasma levels is given by: 3.3xhalflife.Because it takes 10 h to reach 90 steady state, thenHalflife3.310 3hTo achieve clinical steady state usually takes approximately 5xhalflife. 