Medications Calculations Practice
Sheet 1
1. What volume is required for an injection if 500mg are ordered and stock ampules contain
250mg/ml?
2. What volume is required for an injection if 600mg are ordered and stock ampules contain
350mg/ml?
3. What volume is required for an injection if 750mg are ordered and stock ampules contain
200mg/ml?
4. A dose of 2g of medication has ordered for a patient. The medication comes in 4g/0.4mL.
What volume will you give the patient?
5. A dose of 4500mg of medication has ordered for a patient. The medication comes in
5g/0.3mL. What volume will you give the patient?
6. A dose of 3500mg of medication has ordered for a patient. The medication comes in
5g/2mL. What volume will you give the patient?
7. A flask of 1.5L of 0.9% saline is required over 8hrs with a DF of 20. How many DPM is this?
8. A flask of 1L of 4% dextrose in saline is required over 6hrs with a DF of 15. How many DPM is
this?
9. A flask of 850mL of 0.9% saline is required over 12hrs with a DF of 60. How many DPM is
this?
10. A child weighs 13.5kg and is prescribed a medication for 0.8mg/kg/dose. The stock strength
is 10mg/2mL. What volume will you give the patient?
11. A patient weighs 45kg and is prescribed a medication for 3mg/kg/dose. The stock strength is
2mg/0.5mL. What volume will you give the patient?
12. A patient weighs 16.5kg and is prescribed a medication for 0.4mg/kg/dose. The stock
strength is 20mg/5mL. What volume will you give the patient?
13. A 13kg child is ordered a medication for 2.5mg/kg/day with 3 doses per day. How many mg
would you administer per dose?
14. A 3.4kg child is ordered a medication for 5mg/kg/day with 4 doses per day. How many mg
would you administer per dose?
15. A 3800g infant is ordered a medication for 0.6mg/kg/day over 6 doses per day. How much
will you give the patient per day?
16. A patient needs 1mg of a medication. The Australian Injectables Drug Handbook states that
each gram of this medication is to be mixed with 10mL of water over 3-5 minutes via IV
bolus. After preparing the medication, how many mL per minute would you administer if
you do it over 3 minutes?
17. A patient needs 2mg of a medication. The Australian Injectables Drug Handbook states that
each gram of this medication is to be mixed with 10mL of water over 3-5 minutes via IV
bolus. After preparing the medication, how many mL per minute would you administer if
you do it over 3 minutes?
18. A patient needs 4mg of a medication. The Australian Injectables Drug Handbook states that
each gram of this medication is to be mixed with 10mL of water over 3-5 minutes via IV
bolus. After preparing the medication, how many mL per minute would you administer if
you do it over 5 minutes?
19. A child weighs 15kg and is prescribed a medication with a dose of 2mg/kg/day in equal doses
every 4 hours. How many mg will you give per dose?
20. A patient weighs 3kg and is prescribed a medication with a dose of 0.1mg/kg/day in equal
doses every 8 hours. How many mg will you give per dose?
21. A patient weighs 6.5kg and is prescribed a medication with a dose of 0.5mg/kg/day in equal
doses every 12 hours. How many mg will you give per dose?
22. How many mg per mL will be infused for a solution of 350mg of a medication in 100mL of
saline? (Round to one decimal place.)
23. How many mg per mL will be infused for a solution of 400mg of a medication in 300mL of
saline? (Round to one decimal place.)
24. How many mg per mL will be infused for a solution of 550mg of a medication in 200mL of
saline?
Answers – Sheet 1
1. What volume is required for an injection if 500mg are ordered and stock ampules contain
250mg/ml? 2mL
2. What volume is required for an injection if 600mg are ordered and stock ampules contain
350mg/ml? 1.71428 1.7mL
3. What volume is required for an injection if 750mg are ordered and stock ampules contain
200mg/ml? 3.8mL
4. A dose of 2g of medication has ordered for a patient. The medication comes in 4g/0.4mL.
What volume will you give the patient? 0.2mL
5. A dose of 4500mg of medication has ordered for a patient. The medication comes in
5g/0.3mL. What volume will you give the patient? 0.27 0.3mL
6. A dose of 3500mg of medication has ordered for a patient. The medication comes in
5g/2mL. What volume will you give the patient? 1.4mL
7. A flask of 1.5L of 0.9% saline is required over 8hrs with a DF of 20. How many DPM is this?
62.4999 62dpm
8. A flask of 1L of 4% dextrose in saline is required over 6hrs with a DF of 15. How many DPM is
this? 41.6666 42dpm
9. A flask of 850mL of 0.9% saline is required over 12hrs with a DF of 60. How many DPM is
this? 70.83333 71dpm
10. A child weighs 13.5kg and is prescribed a medication for 0.8mg/kg/dose. The stock strength
is 10mg/2mL. What volume will you give the patient? 2.16 2.2mL
11. A patient weighs 45kg and is prescribed a medication for 3mg/kg/dose. The stock strength is
2mg/0.5mL. What volume will you give the patient? 33.75 33.8mL
12. A patient weighs 16.5kg and is prescribed a medication for 0.4mg/kg/dose. The stock
strength is 20mg/5mL. What volume will you give the patient? 1.65 1.7mL
13. A 13kg child is ordered a medication for 2.5mg/kg/day with 3 doses per day. How many mg
would you administer per dose? 10.8333 10.8mg
14. A 3.4kg child is ordered a medication for 5mg/kg/day with 4 doses per day. How many mg
would you administer per dose? 4.25 4.3mg
15. A 3800g infant is ordered a medication for 0.6mg/kg/day over 6 doses per day. How much
will you give the patient per day? 2.28 2.3mg
16. A patient needs 1mg of a medication. The Australian Injectables Drug Handbook states that
each gram of this medication is to be mixed with 10mL of water over 3-5 minutes via IV
bolus. After preparing the medication, how many mL per minute would you administer if
you do it over 3 minutes? 3.3333 3mL/min.
17. A patient needs 2mg of a medication. The Australian Injectables Drug Handbook states that
each gram of this medication is to be mixed with 10mL of water over 3-5 minutes via IV
bolus. After preparing the medication, how many mL per minute would you administer if
you do it over 3 minutes? 6.666 7mL/min.
18. A patient needs 4mg of a medication. The Australian Injectables Drug Handbook states that
each gram of this medication is to be mixed with 10mL of water over 3-5 minutes via IV
bolus. After preparing the medication, how many mL per minute would you administer if
you do it over 5 minutes? 8mL/min.
19. A child weighs 15kg and is prescribed a medication with a dose of 2mg/kg/day in equal doses
every 4 hours. How many mg will you give per dose? 5mg/dose
20. A patient weighs 3kg and is prescribed a medication with a dose of 0.1mg/kg/day in equal
doses every 8 hours. How many mg will you give per dose? 0.1mg/dose
21. A patient weighs 6.5kg and is prescribed a medication with a dose of 0.5mg/kg/day in equal
doses every 12 hours. How many mg will you give per dose? 1.625 1.6mg/dose
22. How many mg per mL will be infused for a solution of 350mg of a medication in 100mL of
saline? (Round to one decimal place.) 3.5mg/mL
23. How many mg per mL will be infused for a solution of 400mg of a medication in 300mL of
saline? (Round to one decimal place.) 1.333 1.3mg/mL
24. How many mg per mL will be infused for a solution of 550mg of a medication in 200mL of
saline? 2.75 2.8mg/mL or 3mg/mL
Sheet 2
1
A patient needs 2g of a medication. It comes in 250mg doses. How many doses need to
be administered? How many hours will it take if the patient can have one dose every 6
hours?
2
An IV drip is set to a flow rate of 55mL/hour. The doctor changes the flow rate to
47,500µL/hour. How much less is the patient now getting per hour? How much will the
patient now get in the next 12 hours?
3
How much dextrose is in 4L of 20% solution?
4
Tablets come in 50mg and 100mg strengths. A patient is prescribed 375mg, how many
tablets will you give them?
5
A patient needs 0.075g of a medicine that comes in 30mg tablets. How many tablets will
the patient take?
6
A patient needs 3g of a medication that comes in 15mg/mL. How much of the solution
will be given?
7
A patient needs 2.5g of a medication that comes in 20mg/5mL. How much of the
solution will be given?
8
An IV drip is set to 1,500mL over 6 hours, how many millilitres per minute will the
patient received?
9
The total volume to be administered from an IV drip is 1,250mL over 10 hours. How
many millilitres per minute will be given?
10
An IV drip has a drop factor of 60. The volume to be administered is 180mL over 5
hours. How many drops per minute will it be?
11
The volume of an IV drip to be administered is 0.25L over 8 hours. The drop factor is 60.
How many drops per minute will it be?
12
A child is prescribed 4.5mg/kg of a medication. He weighs 56kg. How much of the
medication will you administer?
13
A child weighs 14.4kg is prescribed 300µg/kg of a medication. How much of the
medication should be given?
ANSWERS – Sheet 2
1
A patient needs 2g of a medication. It comes in 250mg doses. How many
doses need to be administered? How many hours will it take if the
patient can have one dose every 6 hours?
8 doses, 48
hours
2
An IV drip is set to a flow rate of 55mL/hour. The doctor changes the
flow rate to 47,500µL/hour. How much less is the patient now getting
per hour? How much will the patient now get in the next 12 hours?
7,500µL less,
570mL in next
12 hours
3
How much dextrose is in 4L of 20% solution?
800mL
4
Tablets come in 50mg and 100mg strengths. A patient is prescribed
375mg, how many tablets will you give them?
3 x 100mg
tablets and 1.5
x 50mg tablets
OR
7.5 x 50mg
tablets
5
A patient needs 0.075g of a medicine that comes in 30mg tablets. How
many tablets will the patient take?
2.5 tablets
6
A patient needs 3g of a medication that comes in 15mg/mL. How much
of the solution will be given?
200mL
7
A patient needs 2.5g of a medication that comes in 20mg/5mL. How
much of the solution will be given?
625mL
8
An IV drip is set to 1,500mL over 6 hours, how many millilitres per
minute will the patient received?
4.17mL/min.
>> 4.2mL/min.
9
The total volume to be administered from an IV drip is 1,250mL over 10
hours. How many millilitres per minute will be given?
2.08mL/min.
>> 2mL/min.
10
An IV drip has a drop factor of 60. The volume to be administered is
180mL over 5 hours. How many drops per minute will it be?
36dpm
11
The volume of an IV drip to be administered is 0.25L over 8 hours. The
drop factor is 60. How many drops per minute will it be?
31dpm
12
A child is prescribed 4.5mg/kg of a medication. He weighs 56kg. How
much of the medication will you administer?
252mg
13
A child weighs 14.4kg is prescribed 300µg/kg of a medication. How much
of the medication should be given?
4.32mg or
4,230µg
Sheet 3
1
The total volume ordered is 225mL N/Saline 0.9% IV. The time over which it is to be given is 40
minutes. The drop factor is 15. How many drops per minute will be delivered?
2
The total volume ordered is 550mL N/Saline 0.9% IV. The time over which it is to be given is 4
hours. The drop factor is 20. How many drops per minute will be delivered?
3
The total volume ordered is 1200mL N/Saline 0.9% IV. The time over which it is to be given is 2
hours. How many mL per hour would be delivered?
4
The total volume ordered is 1.5L N/Saline 0.9% IV. The time over which it is to be given is 3
hours. How many mL per hour would be delivered?
5
The dose to be given of a medication is 1.2g. The stock strength is 2g/10mL. Calculate the mL
needed to deliver the medication.
6
The dose to be given of a medication is 5mg. The stock strength is 1mg/4mL. Calculate the mL
needed to deliver the medication.
7
Your patient is receiving 350MICROg of a medication in 750mL of CSL. How many MICROg per
mL is the patient receiving?
8
Your patient is receiving 875g of a medication in 1L of CSL. How many g per mL is the patient
receiving?
9
2L N/Saline 0.9% has been running for 30 minutes at a 6 hourly rate. How many mL have been
administered already?
10
1200mL N/Saline 0.9% has been running for 20 minutes at a 2 hourly rate. How many mL have
been administered already?
11
1300mL N/Saline 0.9% is running at a 6 hourly rate, which commenced at 1500hrs. At 1630hrs
the doctor requests for the remaining volume to be run over 3 hours. Calculate the mL per hour
for the remaining volume.
12
1.5L N/Saline 0.9% is running at a 12 hourly rate, which commenced at 0800hrs. At 1200hrs the
doctor requests for the remaining volume to be run over 4 hours. Calculate the mL per hour for
the remaining volume.
13
A child who weighs 14kg is ordered 55MICROg/kg IV, 2 hours before surgery. The solution
strength is 2mg/mL. How many mL do you administer?
14
A child who weighs 5kg is ordered 0.5g/kg IV, 4 hours before surgery. The solution strength is
2mg/mL. How many mL per hour do you administer?
Answers – Sheet 3
1
The total volume ordered is 225mL N/Saline 0.9% IV. The time over which
it is to be given is 40 minutes. The drop factor is 15. How many drops per
minute will be delivered?
84dpm
2
The total volume ordered is 550mL N/Saline 0.9% IV. The time over which
it is to be given is 4 hours. The drop factor is 20. How many drops per
minute will be delivered?
46dpm
3
The total volume ordered is 1200mL N/Saline 0.9% IV. The time over
which it is to be given is 2 hours. How many mL per hour would be
delivered?
600mL/hr
4
The total volume ordered is 1.5L N/Saline 0.9% IV. The time over which it
is to be given is 3 hours. How many mL per hour would be delivered?
500mL/hr
5
The dose to be given of a medication is 1.2g. The stock strength is
2g/10mL. Calculate the mL needed to deliver the medication.
6mL
6
The dose to be given of a medication is 5mg. The stock strength is
1mg/4mL. Calculate the mL needed to deliver the medication.
20mL
7
Your patient is receiving 350MICROg of a medication in 750mL of CSL.
How many MICROg per mL is the patient receiving?
0.5MICROg/mL
8
Your patient is receiving 875g of a medication in 1L of CSL. How many g
per mL is the patient receiving?
0.9g.mL
9
2L N/Saline 0.9% has been running for 45 minutes at a 6 hourly rate. How
many mL have been administered already?
166.7mL
10
1200mL N/Saline 0.9% has been running for 20 minutes at a 2 hourly rate.
How many mL have been administered already?
200mL
11
1300mL N/Saline 0.9% is running at a 6 hourly rate, which commenced at
1500hrs. At 1630hrs the doctor requests for the remaining volume to be
run over 3 hours. Calculate the mL per hour for the remaining volume.
325mL/hr
12
1.5L N/Saline 0.9% is running at a 12 hourly rate, which commenced at
0800hrs. At 1200hrs the doctor requests for the remaining volume to be
run over 4 hours. Calculate the mL per hour for the remaining volume.
250mL/hr
13
A child who weighs 14kg is ordered 55MICROg/kg IV, 2 hours before
surgery. The solution strength is 2mg/mL. How many mL do you
administer?
0.4mL
14
A child who weighs 5kg is ordered 0.5g/kg IV, 4 hours before surgery. The
solution strength is 1mg/mL. How many mL do you administer?
312.5mL/hr
