The client receives one dose of 200 mg of a medication. How much drug is in the body at 3 half-lives?
50
100
25
75
The Correct Answer is C
Here’s the step-by-step process:
After the first half-life (1 half-life), 50% of the initial drug is left.
200 mg → 100 mg (half is eliminated, 100 mg remains).
After the second half-life (2 half-lives), 50% of the remaining drug is eliminated again.
100 mg → 50 mg (half of 100 mg is eliminated, 50 mg remains).
After the third half-life (3 half-lives), 50% of the remaining drug is eliminated again.
50 mg → 25 mg (half of 50 mg is eliminated, 25 mg remains).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. "Take this medication with a small sip of water or on an empty stomach":
This response is not ideal for calcium carbonate. Calcium carbonate is typically taken with food to help increase its absorption and to reduce the risk of gastrointestinal discomfort, such as constipation or bloating. Taking it on an empty stomach could cause irritation and is not the standard guideline for this medication.
B. "This medication should be taken two hours before other medications":
This is the most appropriate response. Calcium carbonate can interfere with the absorption of other medications, particularly those that require an acidic environment for proper absorption, such as certain antibiotics (e.g., tetracyclines) and thyroid medications. Therefore, taking calcium carbonate two hours before or after other medications helps to prevent such interactions.
C. "Place this medication underneath your tongue and let it dissolve":
Calcium carbonate is typically taken orally in tablet form, not sublingually. The medication should not be dissolved under the tongue, as it is not designed for that route of administration. This would be an incorrect instruction.
D. "You can take as many doses of this medication as you need":
This statement is not accurate. Calcium carbonate should be taken as prescribed and in the correct dosage to avoid side effects such as hypercalcemia or kidney stones. Overuse of calcium supplements can lead to serious complications, and it should not be taken "as needed" without specific instructions from the healthcare provider.
Correct Answer is A
Explanation
A) 1 x soft bowel movement: This is the correct answer. Psyllium is a bulk-forming laxative that helps to relieve constipation by absorbing water into the stool, making it easier to pass. A therapeutic effect of psyllium would be the client experiencing a soft bowel movement, indicating the medication has helped to regulate the client's bowel movements and relieve constipation.
B) Gastric pH 2 (Normal pH: 1-4): While this is a normal gastric pH range, it is not related to the therapeutic effect of psyllium. Psyllium works in the gastrointestinal tract to promote bowel regularity, not to alter gastric pH. The pH measurement of gastric contents is not a relevant indicator of the medication's effectiveness.
C) 500 ml of urine output: This finding is not related to the therapeutic effect of psyllium. Psyllium is intended to address bowel function, not urine output. Adequate urine output should be monitored, but it is not the expected outcome for a patient taking psyllium.
D) Blood glucose: 95 (Normal Fasting Blood Glucose: 60-120): While a normal blood glucose level is important, it is not relevant to the action of psyllium. Psyllium does not have a direct effect on blood glucose levels, so a normal blood glucose result is not indicative of a therapeutic effect of the medication.
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