The client receives 200 mg of a medication on a consistent schedule. How much drug is in the body at 4 half-lives?
387.5
375
393.8
350
The Correct Answer is B
Here's the process for calculating the drug concentration after multiple half-lives:
First half-life: After 1 half-life, 50% of the original dose remains in the body.
200 mg x 0.50 = 100 mg remains after 1 half-life.
Second half-life: After 2 half-lives, 50% of the remaining drug will be eliminated.
100 mg x 0.50 = 50 mg remains after 2 half-lives.
Third half-life: After 3 half-lives, 50% of the remaining drug will be eliminated again.
50 mg x 0.50 = 25 mg remains after 3 half-lives.
Fourth half-life: After 4 half-lives, 50% of the remaining drug will be eliminated once more.
25 mg x 0.50 = 12.5 mg remains after 4 half-lives.
Now, we need to sum up the amount of drug remaining in the body at each half-life:
After 4 half-lives, there are 12.5 mg left from the original dose.
Total drug in the body after 4 half-lives = 200 mg - 12.5 mg = 375 mg.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A) Use perfumes and air fresheners: Using perfumes and air fresheners may actually worsen nausea for some clients, as strong scents can trigger or exacerbate feelings of nausea, particularly in individuals undergoing chemotherapy. It is generally advisable to avoid strong odors in the environment to prevent triggering nausea.
B) Eat foods that are high in fibre: While a balanced diet is important, high-fibre foods may not be helpful in managing nausea and vomiting associated with chemotherapy. In fact, high-fibre foods can sometimes contribute to gastrointestinal discomfort, bloating, or constipation, which may worsen nausea in certain individuals. Therefore, fibre-rich foods are not the best option for reducing nausea and vomiting in this scenario.
C) Drink clear and carbonated beverages: Drinking clear liquids, such as water, ginger ale, or clear broths, can help reduce nausea by keeping the client hydrated and soothing the stomach. Carbonated beverages, such as ginger ale, are often recommended because the bubbles can help alleviate nausea and provide some relief. This is a well-established strategy for managing chemotherapy-related nausea and vomiting.
D) Walk frequently throughout the day: While physical activity is generally beneficial for overall health, walking frequently may not directly address nausea and vomiting caused by chemotherapy. In some cases, walking might even worsen nausea if the client is feeling weak or dizzy. Resting and staying hydrated may be more beneficial in the management of nausea associated with chemotherapy.
Correct Answer is ["20"]
Explanation
1. Determine the concentration of the guaifenesin:
The label states 100 mg/5 mL.
2. Set up a proportion to find the volume (in mL) needed:
100 mg / 5 mL = 400 mg / x mL
3. Solve for x:
Cross-multiply: 100x = 400 * 5
100x = 2000
x = 2000 / 100
x = 20 mL
Answer: The nurse will administer 20 mL to the client.
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