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A prescription reads:
Famotidine 40 mg/5 mL
Quantity: 50 mL
Sig: 0.4 mL PO t.i.d.
What amount of medication, in mg, is given each day?
Suggested Answer: C
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Comprehensive and Detailed Step-by-Step Explanation:
PTCB Exam: Pharmaceutical Calculations
USP <795> Dosing Conversions
21 comments · newest first
JE
Jeff
2 days ago
That means 8 mg per mL.
JE
Jeanice
7 days ago
Exactly! 40 mg in 5 mL.
JU
Judy
12 days ago
But we need mg, not mL!
KA
Kati
17 days ago
So, 0.4 mL times 3 is 1.2 mL daily.
DE
Denise
23 days ago
Right! 0.4 mL t.i.d. means three times a day.
AN
Antonio
28 days ago
I think it’s about calculating the total dose.
JU
Junita
1 month ago
This question is tricky.
NU
Nu
1 month ago
I thought it would be less than that, but I guess it adds up!
SA
Salina
1 month ago
Yup, 0.4 mL is 3.2 mg per dose, three times a day.
JO
Josphine
2 months ago
Wait, are we sure about that? Seems off.
NO
Novella
2 months ago
Totally agree, it's 9.6 mg!
FL
Fletcher
2 months ago
Each dose is 3.2 mg, so that's 9.6 mg daily.
SH
Shawn
2 months ago
I thought it was less than that, interesting!
LA
Lashunda
2 months ago
Yep, that's 9.6 mg a day!
MA
Margart
2 months ago
Wait, are we sure about that?
AH
Ahmed
3 months ago
Totally agree, 0.4 mL is right!
TI
Tiffiny
3 months ago
Each dose is 3.2 mg.
DE
Delmy
3 months ago
I'm really unsure about how to calculate the total mg per day. Is it just the dose times the number of doses?
DE
Detra
3 months ago
If 5 mL contains 40 mg, then 0.4 mL should be a smaller amount. I think I need to multiply to find the total for t.i.d.
MA
Makeda
3 months ago
I practiced a similar question where we had to calculate daily doses, but I can't recall the exact steps for this one.
SH
Shannan
4 months ago
I think I remember that 0.4 mL is a fraction of the total volume, but I'm not sure how to convert that to mg.