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What volume, inmL, of morphine sulfate that comes in10 mL vials at a concentration of 5 mg/mLwill be needed to fill an order for25 mg?
Suggested Answer: C
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Comprehensive and Detailed Step-by-Step Explanation:
Step 1: Use the formula
Explanation of Answer Choices:C. 2.5Correct.2.5 mL provides the required25 mg dose.A. 0.5 Incorrect. Too low.B. 2 Incorrect. Under-dose.D. 5 Incorrect. Over-dose.
Reference:
USP <795>: Pharmaceutical Calculations
PTCB Exam: Dosage Conversions
15 comments · newest first
LO
Lonna
1 month ago
Definitely not! 2.5 mL would only give 12.5 mg.
JU
Jutta
1 month ago
I was thinking it might be 2.5 mL, but that doesn't add up.
KA
Kanisha
1 month ago
Right! 5 mL makes sense for 25 mg.
LO
Lonna
2 months ago
I remember the formula! 25 mg divided by 5 mg/mL equals 5 mL. So, D is correct!
JU
Jutta
2 months ago
I feel like I need to convert the dosage first. 25 mg is a lot.
KA
Kanisha
2 months ago
This question is tricky! I think it's about calculating the right volume.
RE
Reuben
2 months ago
Agreed, 5 mL is the right answer!
LE
Leandro
2 months ago
Wait, are we sure about the math here?
NI
Nichelle
2 months ago
I thought it would be more than that!
OZ
Ozell
3 months ago
Definitely B, 2 mL is way too low.
DA
Daniel
3 months ago
It's 5 mL for 25 mg.
SO
Soledad
3 months ago
I feel like I might be overthinking this. If we need 25 mg and the concentration is 5 mg/mL, isn't it just 5 mL?
CA
Casie
3 months ago
I practiced a similar question last week, and I think the answer was 2.5 mL for a different drug. Could that be the right approach here too?
BO
Bobbye
3 months ago
I think we need to divide the total mg needed by the concentration, so 25 mg divided by 5 mg/mL? That sounds like 5 mL.
AR
Arthur
4 months ago
I remember something about calculating doses, but I'm not sure how to convert mg to mL correctly.