The half-life of a drug is the time it takes for
a. half of the drug to be excreted in the urine
b. plasma concentrations of the drug to drop to half the initial value
c. half of the drug to reach each and every cell of the human body
d. half of the drug to reach the liver and be metabolized
B
A drug's half-life is the time required for plasma concentrations of a drug to decrease to half of an initial value. For example, after one half-life, 50% of the medication remains in the plasma. After 2 half-lives, 25% of the medication remains in the plasma. After 7 half-lives, less than 1% of the medication remains in the plasma.
You might also like to view...
What is correct about proper placement of employees within the organization?
A) Occurs when an attempt is made to place employees in units where they have the greatest chance of success B) Is overrated as a retention strategy because most employees readily adapt to whatever unit on which they are placed C) Refers to placing employees on units that have the greatest need for new staff D) Occurs when employees are able to modify their own personal values and beliefs to coincide with that of the unit on which they are placed
A lumbar puncture is being done on an infant suspected of having meningitis.If the infant has bacterial meningitis,the nurse would expect the cerebral spinal fluid to show
1. elevated white-blood-cell count. 2. elevated red-blood-cell count. 3. normal glucose. 4. decreased white-blood-cell count.
A nurse manager of the long-term care facility develops plans to reduce nutritional deficits. Which of the following interventions is appropriate to include in the plan?
A) Encourage residents to eat in their rooms to minimize distractions. B) Offer four to five small meals a day rather than three larger meals. C) Promote oral care for residents multiple times each day. D) Provide incentives for residents to eat all the food on their trays.
A nurse is working with a client diagnosed with insomnia. When developing a teaching plan for the client, which sleep promotion intervention would the nurse implement first?
A) Encouraging the client to consider stopping smoking B) Instructing the client to keep regular bedtimes and rising times C) Encouraging the client to take frequent naps D) Administering prescribed sleep medications