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If 31.2 mL of water is added to 0.8 mL of drug A, what is the ratio and the percentage of the strength of the solution?
0.8 / (31.2+0.8) = 0.8 / 32 = 1/40. This means the percentage is 2.5% and the ratio is 1:39
A medication order calls for two tablets q.i.d. the first day, one tablet b.i.d. the second and third days, and one tablet q.d. thereafter for a total of two weeks. How many tablets must be
dispensed in total?
QID is 4x a day, BID is 2x a day, and QD is 1x a day. 2*4*1+1*2*2+1*1*(14-3) = 8+4+11=23
A medication order calls for 1.5 liters of glucose solution to be administered by IV over a 10-hour period. What will be the flow rate if the drop factor is 10?
1500ml 10 gtt 25 gtt
*

600 min mL
min
If you remove 75 milliliters, 1.2 liters, 400 milliliters, and 1/4 liter from a container of solution, how many milliliters did you remove in total?
75 + 1200 + 400 + 250 = 1925 ml
A 45 kg patient requires a 450 mg dose of a particular drug. A solution contains 150 mg of the drug per teaspoon. How many mL of the solution should be given to the patient to deliver the
required dose of drug?
450 / 150 = 3 tsp. 1 tsp = 5 ml, so 15 ml dose.
How many grams of a drug must be used to prepare 3 liters of a 2% solution?
3 * 0.02 = 0.06 g
A particular drug is supplied in tablets of 600-mg strength. A 90 lb patient requires a one-week supply of this drug at a dose of 20 mg/lb every 12 hours. How many tablets are required in
total?
90lb 20mg 1tab
168hrs 1dose
*
*
)*(
*
)
1
lb
600mg
wk
12hrs
dose
tablets
3tab *14
 42
wk
week
(
An animal is to receive 250 mg metronidazole by IV every 12 hours and to give over 60 minutes. The metronidazole comes in 5 mg/mL. What is the flow rate in drops per minute if the drop
factor is 10?
250mg 1mL 10 gtt
gtt
*
*
 8. 3
60 min 5mg mL
mL
If 425 grams of sucrose are dissolved in enough water to make 2,000 milliliters of solution, what is the percentage strength of the solution?
425 / 2000 = 21.25%
A doctor administers 2 mL of a 50 mg/mL sedative to a 180 lb patient. What is the equivalent dose in mg/kg?
1
2.2lb 2mL 50mg 220mg
*
*
*

 1.2 mg / kg
180lb kg
1
1mL
180kg
If there's 1.2 g of codeine in 125 mL of a particular cough syrup, how many milligrams are contained in 1 teaspoon of the syrup?
1.2 g 1000mg 5mL 48mg
*
*

125mL
1g
1tsp
1tsp
If a 176 lb patient must be given 1 mL/kg of a drug every 8 hours for 7 days, what is the total volume of drug that must be administered?
3dose 7days 176lb 1kg
1mL
1680mL
*
*
*
*

day series
2.2lb kg * dose
series
Your patient needs 0.6 grams of Quinidine q.i.d. You have 200 mg tablets on hand. How many tablets are needed at each dosage time?
0.6 g = 600 mg, so 3 tablets are needed each time.
Ketamine is available in a 100 mL vial that contains 100 mg/mL. If 1 mL of ketamine is diluted 1:50, how many mg are in 5 mL of diluted solution?
Since 100 mL has 100 mg, 1 mL has 1 mg. If it is diluted 1:50, then 1 mg is in 51 mL. This means that there is 5/51 mg in 5 mL
One tablet contains 8 mg of a particular drug. A medication order calls for three and one-half tablets to be given to a 150 lb patient. What dose of the drug is given to this patient, in mg/kg?
8mg 3.5tablet 2.2lb
1
mg
*
*
*
 0.4016
tablet
1
1kg 150lb
kg
If an IV solution contains 8% mannitol, how many mL of the solution should be administered to provide a patient with 50 grams of mannitol?
Since each mL contains 8 g, you need 50/8 = 6.5 mL
You're ordered to give your patient 20 mg of Lasix IV. You have on hand a 10 mL vial containing 100 mg. What is the correct dosage?
20/100=1/5 so use 1/5 of 10 mL so 2 mL will do it.