Complex / Doris Turner Med Math Questions
1. Problem type: IV infusion rate + infusion pump
Medication: azithromycin
PROBLEM
Suppose Mrs. Turner’s
... [Show More] orders call for 500 mg of azithromycin to be administered
intravenously for communityacquired pneumonia. The solution has been diluted to a
concentration of 2 mg/mL and needs to be administered over 1 hour.
At what rateshould the infusion pump be set?
HINT
Start by figuring out how many milliliters will be needed to administer the ordered dose.
SAMPLE SOLUTION
1. Determine how many milliliters of the concentration will be delivered to administer
the ordered dose.
500 mg x 1 mL= 250 mL
2 mg
2. Divide the total number of mL needed to deliver the 500 mg by the expected
duration of 1 hour.
250 mL= 250 mL/hr
1 hr
ANSWER
Number: 250
Units / Rate: mL/hr2. Problem type: Dosage calculation + Stock on hand
Medication: venlafaxine
PROBLEM
Mrs. Turner’s daily medications include venlafaxine extendedrelease, 150 mg, by
mouth, once a day. However, the hospital pharmacy only carries 75 mg
extendedrelease tablets.
How many tablets of venlafaxine extendedreleaseshould be administered to her?
HINT
You can use the equation below, where X is the number of tablets that should be
administered.
D (ordered dose ) x Quantity = X
H (dose on hand)
SAMPLE SOLUTION
1. Determine what information you have.
D (ordered dose) = 150 mg
H (dose on hand) = 75 mg
Q (quantity) = 1 tablet
2. Plug into the equation and solve.
D (150 mg ) x 1 tablet = X
H (75 mg)
X = 2 tablets
ANSWER
Number: 2
Units: tablets3. Problem type: Total daily dosage
Medication: Acetaminophen @ hospital hypothetical
Suppose Mrs. Turner’s provider updated her order for 325 mg, 2 tabs, by mouth q6h
PRN temp. > 100.5 F to 325 mg, 2 tabs, by mouth q4h PRN temp. > 100.5 F. The
Davis’s Drug Guide reports that acetaminophen has a maximum recommended dosage
of 4 g/day.
How many dosescan Mrs. Turner take without exceeding the recommended maximum
dosage?
HINT
There are 1000 mg in one gram.
SAMPLE SOLUTION
1. Determine how many milligrams are in 4 grams.
4 g x 1000 mg= 4000 mg
1 g
2. Determine how many 325 mg tablets go into 4000 mg.
4000 mgx 1 tablet = 12.3 tablets
325 mg
3. Round down to the nearest whole tablet = 12 tablets
4. Divide the total number of tablets by the number tablets in a dose.
12 tablets total x 1 dose = 6 doses
2 tablets
ANSWER
Number: 6
Units: doses4. Problem type: Total daily dose calculation
Medication: acetaminophen @ hospital
PROBLEM
Suppose Mrs. Turner’s current temperature is 100.8 F. For temperatures greater than 100.5
F, the prescriber’s order allows acetaminophen, 325 mg, 2 tabs, by mouth, every 6 hours.
Assume that on her first day of hospitalization, Mrs. Turner’s temperature is greater than
100.5 F three times. [Show Less]