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PTCB PTCE Exam - Topic 1 Question 117 Discussion

Actual exam question for PTCB's PTCE exam
Question #: 117
Topic #: 1
[All PTCE Questions]

A physician prescribes5 mg/kgof a drugtwice dailyfor a patient weighing110 lbs. How many0.5 g tabletsof the drug are required for a10-day duration?

Show Suggested Answer Hide Answer
Suggested Answer: C

Comprehensive and Detailed Step-by-Step Explanation:

Explanation of Answer Choices:C. 20Correct.2 tablets per day 10 days = 20 tablets.A. 5 Incorrect. Under-dose.B. 10 Incorrect. Under-dose.D. 40 Incorrect. Over-dose.

Reference:

USP <795> Pharmaceutical Calculations

PTCB Exam: Dosing Conversions


by Jennifer at Nov 25, 2025, 12:24 AM

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Lashawnda
1 month ago
That means 5000 mg total. Dividing by 500 mg per tablet gives 10 tablets.
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Lizbeth
2 months ago
Exactly! Twice a day for 10 days is 20 doses total.
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Shanice
2 months ago
So, 5 mg/kg means 250 mg per dose, right?
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Layla
2 months ago
Yeah, 110 lbs is about 50 kg.
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Azzie
2 months ago
How did you get that number? I'm confused!
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Trinidad
2 months ago
Totally agree, it's definitely 20 tablets!
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Fabiola
2 months ago
Wait, are we sure about the conversion?
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Coleen
3 months ago
I think that's 20 tablets for 10 days!
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Catrice
3 months ago
That's 5 mg/kg for a 110 lb patient, right?
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Ranee
3 months ago
Wait, did they say the patient weighs 110 lbs? In that case, the answer must be C) 20 tablets. Easy peasy!
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Claribel
4 months ago
Haha, this is like a math word problem straight out of a med school exam! I'll guess D) 40 tablets, just to be safe.
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Felix
4 months ago
Hmm, let me think this through. 5 mg/kg twice daily for 10 days... I'll go with D) 40 tablets.
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Leonida
4 months ago
I’m leaning towards option C, but I’m not completely confident. I should double-check the total amount needed for the full 10 days.
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Bette
4 months ago
If the patient is 110 lbs, that’s about 50 kg, right? So, I guess we multiply 5 mg by 50 kg, then figure out how many tablets that is.
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Emmett
4 months ago
I’m a bit unsure about the total dosage over 10 days. I feel like I practiced a similar question, but I can’t recall the exact steps.
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Dion
4 months ago
I think I remember that we need to convert the weight from pounds to kilograms first. That might be important for the calculation.
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Sabrina
5 months ago
Wait, is the daily dose 5 mg/kg or 5 mg total? I'm not sure if I'm interpreting that correctly. I better double-check my work.
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Moira
5 months ago
Okay, I'm feeling pretty confident about this one. Just need to remember the right steps and unit conversions. I think I can nail this question.
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Nathalie
5 months ago
Hmm, I think I've got this. We need to convert the weight to kg, then multiply by the dose of 5 mg/kg to get the daily dose. Since it's twice daily, we double that. Then we need to figure out how many 0.5 g tablets that is for 10 days.
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Shoshana
5 months ago
I think the answer is C) 20 tablets.
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Aileen
5 months ago
This question is tricky! I need to convert the weight first.
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Dorsey
6 months ago
The question is a bit tricky, but I'm pretty sure the correct answer is B) 10 tablets.
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Lenna
6 months ago
I think the answer is B) 10. Makes sense to me!
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Cherilyn
6 months ago
I'm a bit confused on the unit conversions here. Do we need to convert the weight from lbs to kg, or can we just use the lbs directly?
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Layla
6 months ago
Okay, let's think this through step-by-step. We need to convert the patient's weight from lbs to kg, then calculate the daily dose, and finally determine how many 0.5 g tablets are needed for 10 days.
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Ludivina
20 days ago
Each tablet is 0.5 g, so we need 10 tablets.
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Jill
25 days ago
For 10 days, that's 5000 mg total.
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Jules
1 month ago
Twice daily means 250 mg times 2. That's 500 mg per day.
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Na
1 month ago
Right! Now, we calculate the daily dose. 5 mg/kg for 50 kg is 250 mg.
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Davida
5 months ago
First, we convert 110 lbs to kg. That's about 50 kg.
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