The nurse administers orally 400 mg of a drug with a half-life of 2 hours at noon.At which time will the patient's blood drug level first be less than 40 mg?

Question

Quizplus · Accepted Answer

With a half-life of 2 hours,the amount of drug remaining in the blood decreases by 50% every 2 hours.So,when 400 mg are given at noon,by 2:00 p.m.200 mg remain; by 4:00 p.m.,100 mg remain; by 6:00 p.m.,50 mg remain; by 8:00 p.m.,25 mg remain; by 10:00 p.m.,12.5 mg remain,and by midnight,6.25 mg remain.

The Nurse Administers Orally 400 Mg of a Drug with a Half-Life