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Medications Calculations Practice
Sheet 1
- What volume is required for an injection if 500mg are ordered and stock ampules contain 250mg/ml?
- What volume is required for an injection if 600mg are ordered and stock ampules contain 350mg/ml?
- What volume is required for an injection if 750mg are ordered and stock ampules contain 200mg/ml?
- 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?
- 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?
- A dose of 3500mg of medication has ordered for a patient. The medication comes in 5g/2mL. What volume will you give the patient?
- A flask of 1.5L of 0.9% saline is required over 8hrs with a DF of 20. How many DPM is this?
- A flask of 1L of 4% dextrose in saline is required over 6hrs with a DF of 15. How many DPM is this?
- A flask of 850mL of 0.9% saline is required over 12hrs with a DF of 60. How many DPM is this?
- 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?
- 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?
- 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?
- 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?
- 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?
- 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?
- 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?
Answers – Sheet 1
- What volume is required for an injection if 500mg are ordered and stock ampules contain 250mg/ml? 2mL
- What volume is required for an injection if 600mg are ordered and stock ampules contain 350mg/ml? 1.71428 1.7mL
- What volume is required for an injection if 750mg are ordered and stock ampules contain 200mg/ml? 3.8mL
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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.
- 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.
- 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.
- 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
- 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
- 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
- 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
- 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
- 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
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
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? 8 00mL 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. 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 300 μg/kg of a medication. How much of the medication should be given? 4.32mg or 4,230μg
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 2 mg/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 875 g of a medication in 1 L 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
