Dosage Calculations Practice
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1. Order: Biaxin 200 mg p.o. q 12 h for a 1. Convert lbs to kgs. 45lbs = 20.5 kg
child who weighs 45 lbs.
Have: Biaxin 125 mg per 5 mL 2. Calculate the recommended dose per day. A
child weighing 20.5 kg can have 307.5 mg PER
Biaxin label states 15 mg/kg/day in two DAY. So, divide 307.5 by 2 to get a single dose.
equal doses. So, the maximum single dose is 153.75 mg.
Is this dosage safe? 3. NO, the ordered dose is not safe. The doctor
ordered 200 mg which is more than 153.75 mg.
2. How many mcg in a mg? 1000
3. Order: D5LR 1250 mL IV over 8 hours. Answer: 156 mL/h
What is the infusion rate in mL/h? Divide 1250 by 8
156.25 => 156
4. Order: Amoxil 200 mg q 8 h 1. First, calculate the minimum and maximum
Have: 50 mg/ml dose per day. The minimum amount would be
200 mg. (20 x 10) The maximum amount would
Label: 20 to 40 mg/kg/day in divided be 400 mg. (40 x 10)
doses every 8 hours.
2. Now, since the dose is given every 8 hours,
The patient weighs 10 kg. Is this order divide the minimum and maximum by 3, since
safe? 3 doses can be given in one day (24 hours).
The minimum single dose is 66.7 mg, and the
maximum single dose is 133.3 mg.
3. NO, the ordered dose is not safe. The doctor
ordered 200 mg for a single dose which is more
than the maximum allowed single dose of 133.3
mg.
, Dosage Calculations Practice
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5. How many mL in a teaspoon (tsp)? 5
6. How many grams are in a kilogram? 1000
7. How many teaspoons are in a table- 3
spoon?
8. How many ounces are in a pound? 16
9. How many pounds are in a kilogram? 2.2
10. Convert 21.3 kg to lbs. 46.86
11. Tridil is infusing at 15 mL/hr on an infu- Answer: 25 mcg/min
sion pump. The drug is mixed 50 mg in
500 mL DsW. How many mcg/min is the First, convert the 50 mg to mcg. 50 mg = 50,000
patient receiving? mcg
Now, how many mcg is in 1 mL?
50,000 mcg/500 mL = 100 mcg/mL
Now, how many mcg/hr is the pt receiving?
100 mcg x 15 mL = 1,500 mcg/hr
So, 1500 mcg/60 min = 25 mcg/min
12. How many mL in a tablespoon (T or tbs)? 15
13. How many mL in one ounce? 30
14. Convert 0.3 g to kg. 300
15. How many ounces in a cup? 8
16. How many mL in a cup? 240
, Dosage Calculations Practice
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17. Convert 22.2 kg to lbs. 48.84 lbs
18. Convert 89 kg to lbs. 195.8
19. Order: D5W IV at 125 mL/h Answer: 21 gtt/min
Drop factor: 10 gtt/mL (volume in mL/time in min) x drop factor
Calculate flow rate in gtt/min. (125/60) x 10
2.08 x 10 = 20.8 => 21
20. Convert 2250 g to kg. 2.25 => 2.3
21. A child weighs 10 lb 2 oz. What is their 1. First, convert the 2 oz to lbs. 2 oz is 0.1 lbs. This
weight in kg? gives you 10.1 lbs.
2. Now convert 10.1 lbs to kg.
3. Answer: 4.59 => 4.6 kg
22. Convert 8 lbs 4 oz to kg. 3.8 kg
23. You are caring for a patient at home 2
who must take magnesium hydrox-
ide/aluminum hydroxide (Maalox) 30
mL PO. How many tbsp will you instruct
the patient to take?
24. A patient has a bottle of warfarin 1.5
(Coumadin) 5 mg tablets at home. Af-
ter his most recent international nor-
malized ratio (INR), the doctor calls and
Study online at https://quizlet.com/_8lpzg8
1. Order: Biaxin 200 mg p.o. q 12 h for a 1. Convert lbs to kgs. 45lbs = 20.5 kg
child who weighs 45 lbs.
Have: Biaxin 125 mg per 5 mL 2. Calculate the recommended dose per day. A
child weighing 20.5 kg can have 307.5 mg PER
Biaxin label states 15 mg/kg/day in two DAY. So, divide 307.5 by 2 to get a single dose.
equal doses. So, the maximum single dose is 153.75 mg.
Is this dosage safe? 3. NO, the ordered dose is not safe. The doctor
ordered 200 mg which is more than 153.75 mg.
2. How many mcg in a mg? 1000
3. Order: D5LR 1250 mL IV over 8 hours. Answer: 156 mL/h
What is the infusion rate in mL/h? Divide 1250 by 8
156.25 => 156
4. Order: Amoxil 200 mg q 8 h 1. First, calculate the minimum and maximum
Have: 50 mg/ml dose per day. The minimum amount would be
200 mg. (20 x 10) The maximum amount would
Label: 20 to 40 mg/kg/day in divided be 400 mg. (40 x 10)
doses every 8 hours.
2. Now, since the dose is given every 8 hours,
The patient weighs 10 kg. Is this order divide the minimum and maximum by 3, since
safe? 3 doses can be given in one day (24 hours).
The minimum single dose is 66.7 mg, and the
maximum single dose is 133.3 mg.
3. NO, the ordered dose is not safe. The doctor
ordered 200 mg for a single dose which is more
than the maximum allowed single dose of 133.3
mg.
, Dosage Calculations Practice
Study online at https://quizlet.com/_8lpzg8
5. How many mL in a teaspoon (tsp)? 5
6. How many grams are in a kilogram? 1000
7. How many teaspoons are in a table- 3
spoon?
8. How many ounces are in a pound? 16
9. How many pounds are in a kilogram? 2.2
10. Convert 21.3 kg to lbs. 46.86
11. Tridil is infusing at 15 mL/hr on an infu- Answer: 25 mcg/min
sion pump. The drug is mixed 50 mg in
500 mL DsW. How many mcg/min is the First, convert the 50 mg to mcg. 50 mg = 50,000
patient receiving? mcg
Now, how many mcg is in 1 mL?
50,000 mcg/500 mL = 100 mcg/mL
Now, how many mcg/hr is the pt receiving?
100 mcg x 15 mL = 1,500 mcg/hr
So, 1500 mcg/60 min = 25 mcg/min
12. How many mL in a tablespoon (T or tbs)? 15
13. How many mL in one ounce? 30
14. Convert 0.3 g to kg. 300
15. How many ounces in a cup? 8
16. How many mL in a cup? 240
, Dosage Calculations Practice
Study online at https://quizlet.com/_8lpzg8
17. Convert 22.2 kg to lbs. 48.84 lbs
18. Convert 89 kg to lbs. 195.8
19. Order: D5W IV at 125 mL/h Answer: 21 gtt/min
Drop factor: 10 gtt/mL (volume in mL/time in min) x drop factor
Calculate flow rate in gtt/min. (125/60) x 10
2.08 x 10 = 20.8 => 21
20. Convert 2250 g to kg. 2.25 => 2.3
21. A child weighs 10 lb 2 oz. What is their 1. First, convert the 2 oz to lbs. 2 oz is 0.1 lbs. This
weight in kg? gives you 10.1 lbs.
2. Now convert 10.1 lbs to kg.
3. Answer: 4.59 => 4.6 kg
22. Convert 8 lbs 4 oz to kg. 3.8 kg
23. You are caring for a patient at home 2
who must take magnesium hydrox-
ide/aluminum hydroxide (Maalox) 30
mL PO. How many tbsp will you instruct
the patient to take?
24. A patient has a bottle of warfarin 1.5
(Coumadin) 5 mg tablets at home. Af-
ter his most recent international nor-
malized ratio (INR), the doctor calls and
