The nurse is researching a drug that has a median effective dose ...

[mia]

The nurse is researching a drug that has a median effective dose (ED50) of 5 mg and a median lethal dose (LD50) of 20 mg. Which therapeutic index (TI) calculated by the nurse is correct?
 
  1. 5
  2. 4
  3. 1
  4. 10

Question 2

The nurse checks the margin of safety (MOS) for a drug that will be administered to a client, knowing that the MOS is the amount of drug that is lethal to ____  of animals divided by the amount that produces a therapeutic effect in ____  of animals.
 
  Fill in the blank with the appropriate word.

[Bsand8]

Answer to Question 1

Correct Answer: 2
Rationale 1: The TI is calculated by dividing the median LD by the median ED. Twenty divided by 5 does not equal 5.
Rationale 2: The TI is calculated by dividing the median LD by the median ED. Twenty divided by 5 equals 4.
Rationale 3: The TI is calculated by dividing the median LD by the median ED. Twenty divided by 5 does not equal 1.
Rationale 4: The TI is calculated by dividing the median LD by the median ED. Twenty divided by 5 does not equal 10.
Global Rationale: The TI is calculated by dividing the median LD by the median ED. Twenty divided by 5 equals 4.

Answer to Question 2

Correct Answers: 1, 99
Rationale: The MOS is calculated as the amount of drug that is lethal to 1 of animals (LD1) divided by the amount of drug that produces a therapeutic effect in 99 of the animals (ED99).
Global Rationale: The MOS is calculated as the amount of drug that is lethal to 1 of animals (LD1) divided by the amount of drug that produces a therapeutic effect in 99 of the animals (ED99).

[mia]

YES! Correct, THANKS for helping me on my review

[xiaomengxian]

Gracias!