A drug with a half-life of 4 hours is administered at a dosage of ...

[neverstopbelieb]

A drug with a half-life of 4 hours is administered at a dosage of 100 mg. How much of the drug will be in the patient's system 8 hours after administration?
 
  A) 75 mg
  B) 50 mg
  C) 37.5 mg
  D) 25 mg

Question 2

The emergency room nurse admits a patient suspected of having giardiasis. What symptoms would the nurse expect the patient to present with?
 
  A) Voluminous soft unformed stool
  B) Frothy voluminous pale stool
  C) Pale and mucous-filled stool
  D) Frothy tan stool

[jomama]

Answer to Question 1

D
Feedback:
The half-life of a drug is the time it takes for the amount of drug in the body to decrease to 1 half the peak level it previously achieved. Option A would occur 2 hours after administration of the drug. Option B would occur at 4 hours. Option C would occur at 6 hours. Option D would occur at 8 hours after the original administration of the drug.

Answer to Question 2

C
Feedback:
Diarrhea, rotten-egg-smelling stool, and pale and mucous-filled stool are commonly seen. Diarrhea is often accompanied by epigastric distress, weight loss, and malnutrition as a result of the invasion of the mucosa. Therefore, options A, B, and D are incorrect.

[neverstopbelieb]

Gracias!

[peter]

Excellent