PTCB PTCE Exam - Topic 4 Question 129 Discussion

Actual exam question for PTCB's PTCE exam

Question #: 129
Topic #: 4

[All PTCE Questions]

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?

A1.2 mg

B3.2 mg

C6.4 mg

D9.6 mg

Show Suggested Answer

Suggested Answer: C

Comprehensive and Detailed Step-by-Step Explanation:

PTCB Exam: Pharmaceutical Calculations

USP <795> Dosing Conversions

by Allene at Jun 27, 2026, 12:11 AM

Limited Time Offer

25%

Off

Get Premium PTCE Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Josphine

3 days ago

Wait, are we sure about that? Seems off.

upvoted 0 times

...

Novella

8 days ago

Totally agree, it's 9.6 mg!

upvoted 0 times

...

Fletcher

14 days ago

Each dose is 3.2 mg, so that's 9.6 mg daily.

upvoted 0 times

...

Shawn

19 days ago

I thought it was less than that, interesting!

upvoted 0 times

...

Lashunda

24 days ago

Yep, that's 9.6 mg a day!

upvoted 0 times

...

Margart

29 days ago

Wait, are we sure about that?

upvoted 0 times

...

Ahmed

1 month ago

Totally agree, 0.4 mL is right!

upvoted 0 times

...

Tiffiny

1 month ago

Each dose is 3.2 mg.

upvoted 0 times

...

Delmy

1 month ago

I'm really unsure about how to calculate the total mg per day. Is it just the dose times the number of doses?

upvoted 0 times

...

Detra

2 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.

upvoted 0 times

...

Makeda

2 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.

upvoted 0 times

...

Shannan

2 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.

upvoted 0 times

...