Math Calc

A patient will be given 120 ml per day of medication. If the medication is to be given 3 times per day,

how much is given in each dose?

40ml

A patient is given 15 ml doses of a medication 4 times per day. What is the daily dose for the patient?

60ml

A patient is to be given 8 ml of a medication daily. The medication is to be given 6 hourly. How much is

given in each dose?

2ml

A patient is given 1.5 ml doses of a medication 8 hourly. What is the daily dose?

4.5ml

A patient will be given 18 ml per day of medication. If the medication is to be given 4 hourly, how much

is given in each dose?

3ml

A patient is to be given 90 ml of a medication daily. The medication is to be 6 times per day. How much

is given in each dose?

15ml

A patient is given 3.5 ml doses of a medication every 4 hours. What is the daily dose for the patient?

21ml

A patient is given 1.2 ml of a medication 6 hourly. What is the daily dose?

4.8ml

Amoxycillin is prescribed as 500 mg in 250 ml.

The drug is available in 80 mg/ml. Calculate how

much stock and how much diluent is required to

make up this order.

6.25 ml of stock and 243.75 ml or 244 ml of diluent

Order: KCL 10 mmol in 150 ml

Stock: 10 mmol per 10 ml.

a) Calculate the correct dosage.

b) How much diluent will you need to add?

a) 10 ml b) 140 ml

Prescribed: Keflex suspension 500 mg in 50 ml

Available medication: 125 mg/5 ml

Complete the following:

Take ______ ml of stock solution and

add ______ ml of diluent

Take 20 ml of stock solution and add 30 ml of diluent

Give Chloral hydrate 60 mg in 50 ml

Available is Chloral hydrate 200 mg per 2 ml.

a) Determine the dosage of Chloral hydrate.

b) Determine the volume (mls) of diluent to add.

a) 0.6 ml b) 49.4 ml

The doctor orders medication 4 mg in 500 ml.

The available solution is 200 μg/5 ml.

a) What dose of drug is administered?

b) What volume of diluent is added?

a) 100 ml b) 400 ml

Prescribed: Chloral hydrate 50 mg in 50 ml

Available medication: Chloral hydrate 100 mg/ml

Complete the following:

Take ______ ml of stock solution and

add ______ ml of diluent

Take 0.5 ml of stock solution and add 49.5 ml of diluent

Order: Medication 15000 U in 250 ml

Stock: 4000 U/5 ml

a) Calculate the correct dosage.

b) How much diluent will you need to add?

a) 18.75 ml b) 231.25 ml or 231 ml

The doctor orders Amoxycillin 500 mg in 200 ml.

The available solution is 400 mg per 5 ml.

a) What dose of drug is administered?

b) What volume of diluent is added?

a) 6.25 ml b) 193.75 ml or 194 ml

(a) A drug is to be administered at the rate of 5 mg/m2. How much should a person

with a body surface area of 1.53 m2 receive?

(b) The drug in (a) is available as 250 mcg/ml. What volume should be administered?

a) 7.65 mg (b) 30.6 ml or 31 ml

(a) A patient with a body surface area of 1.86 m2 is to receive a drug at 10 mg/m2.

How many mg are required?

(b) If the drug in (a) comes as 0.15 g/20 ml, how many ml would be needed?

a) 18.6 mg (b) 2.48 ml or 2.5 ml

To give a 75 000 U dose of Penicillin V from a stock solution of 400 000 U/5 ml, how

much would you give?

0.94 ml

Order: Amoxicillin 85 mg po tid.

Supply:Amoxicillin Oral Suspension 125 mg/5 ml (80 ml bottle).

Explain what you would give and when.

3.4 ml orally 3 times daily

You must add 80 mmol to each litre of sterile water. The electrolyte is labelled

5 mmol/40 ml.

(a) How many ml are added to each litre?

(b) How many mmol is this?

a) 640 ml (b) 80 mmol

A drug is available in 100 ml bottles, containing 400 μg/3 ml.

(a) What volume needs to be drawn to administer 1.6 mg?

(b) A patient is given 2.5 ml. How many mg of drug is this?

a) 12 ml (b) 0.33 mg

Order: Inderal 35 mg bd pc.

Supply:Inderal 10 mg/scored tablet

Give the full dosage instructions.

3½ or 3.5 tablets 2 times/day after meals

Compazine 8 mg in 50 ml is prescribed.

Compazine 15 mg per 20 ml is available.

How much:

(a) stock, and

(b) diluent is required?

a) 10.7 ml Compazine stock solution (b) add 39.3 ml of diluent

Penicillin 1 MU (1 000 000 U) is available.

Reconstitution instructions are: add 3.5 ml sterile diluent to obtain 250 000 U/ml.

(a) If the whole vial is made up, how many ml of reconstituted solution will

there be?

(b) What volume should be drawn up to administer a 100 000 U dose?

a) 4 ml (b) 0.4 ml

How much

(a) Stock solution, and

(b) diluent

would be necessary to prepare Temaril 4.5 mg in 150 ml from Temaril 5 mg/20 ml?

a) 18 ml Temaril stock solution (b) add 132 ml of diluent

Calculate the amount of drug and diluent required to prepare 40 mg in 200 ml from 25

mg tablets

1.5 tablets dissolved in liquid and made up to 200 ml

Order: Keflin 300 mg IM

Label: Keflin 1 g

Reconstitution: Add 4ml sterile water to yield 0.5 g/2.2 ml

Describe how you would proceed.

Add 4 ml of sterile water to l g of Keflin to obtain 0.5 g per 2.2 ml. Inject 1.3 ml.

Penicillin is available as: Penicillin 0.5 g/vial.

Reconstitution instructions: Add 2.7 ml of sterile water to obtain a concentration of

250 mg/1.5 ml.

Calculate the quantities necessary to administer 200mg IM.

Add 2.7 ml of sterile water and extract 1.2 ml

Calculate the quantity of stock and solvent required to make 7 mmol in 150 ml from

an available solution of 7.5 mmol in 5 ml.

4.7 ml of stock and 145.3 ml of diluent.

Order: Keflin 100 mg IM

Label: Keflin 1 g

Reconstitution: Add 4 ml sterile water to yield 0.5 g/2.2 ml

What is the total volume available after reconstitution?

How much do you draw up for administration?

Adding 4 ml of sterile water will yield 4.4 ml available volume (0.5 g/ 2.2 ml). Draw

up 0.44 ml for injection.

Calculate the amount of drug and diluent required to prepare 15 mg in 500 ml from 5

mg tablets.

3 tablets dissolved in liquid and made up to 500 ml.

Calculate the quantity of stock and solvent required to make 200 000 U in 50 ml from

an available solution of 75 000 U in 2 ml.

5.3 ml of stock and 44.7 ml of diluent.

Order: Amoxicillin 100 mg po tid.

Supply: Amoxicillin Oral Suspension 80 mg/4 ml (80 ml bottle).

Explain what you would give and when.

Give 5 ml by mouth, 3 times per day

You must add 65 mmol to each litre of sterile water. The electrolyte is labelled

3 mmol/15 ml.

(a) How many ml are added to each litre?

(b) How many mmol is this?

a) 325 ml (b) 65 mmol

Order: Inderal 25 mg q6h cc.

Supply: Inderal 10 mg/scored tablet

Give the full administration details

2½ or 2.5 tablets every 6 hours with food.

Calculate the flow rate for 250ml of Sodium Chloride 0.9% to be given using a standard drop set of 20 drops/mL over 3 hours.

3 hours = 3 × 60 = 180 min

20 × 250 = 5000 drops (total)

5000 ÷ 180 = 27.77778 drops/min

= 28 drops/min (rounded)

Determine the drip rate of 100 mL of fluid administered over 90 minutes using a standard giving set of 20 drops/mL.

20 × 100 = 2000 drops (total)

2000 ÷ 90 = 22.22222 drops/min

= 22 drops/min (rounded)

Calculate the infusion rate for 150 mL of medication administered using a standard drop set of 20 drops/mL over 2 hours.

2 hours = 2 × 60 = 120 min

20 × 150 = 3000 drops (total)

3000 ÷ 120 = 25 drops/min

A patient is receiving fluid using drop factor of 20 drops/ml. What is the drip rate for 250 mL to be infused over 4 hours?

4 hours = 4 × 60 = 240 min

20 × 250 = 5000 drops (total)

5000 ÷ 240 = 20.83333 drops/min

= 21 drops/min (rounded)

One litre of Normal Saline is to be administered over 8 hours using a standard drop set of 20 drops/mL. Calculate the infusion rate.

8 hours = 8 × 60 = 480 min

1 L = 1000 mL

20 × 1000 = 20 000 drops (total)

20 000 ÷ 480 = 41.66667 drops/min

= 42 drops/min (rounded)

What is the drip rate to infuse 500 mL over 3 hours using a giving set of 20 drops per mL?

3 hours = 3 × 60 = 180 min

20 × 500 = 10 000 drops (total)

10 000 ÷ 180 = 55.55556 drops/min

= 56 drops/min (rounded)

Two litres of saline needs to be administered over ten hours. Calculate the flow rate using a drop factor of 20 drops per millilitre.

10 hours = 10 × 60 = 600 min

2 L = 2 × 1000 = 2000 mL

20 × 2000 = 40 000 drops (total)

40 000 ÷ 600 = 66.66667 drops/min

= 67 drops/min (rounded)

Determine the flow rate to infuse half a litre of medication over six hours using a microdrip giving set of 60 drops per mL.

6 hours = 6 × 60 = 360 min

½ L = 0.5 × 1000 = 500 mL

60 × 500 = 30 000 drops (total)

30 000 ÷ 360 = 83.33333 drops/min

= 83 drops/min (rounded)

What is the drip rate for an IV infusion over 90 minutes of 150 mL of Dextrose 10% using a microdrip drop set of 60 drops/mL?

60 × 150 = 9000 drops (total)

9000 ÷ 90 = 100 drops/min (rounded)

10) 8 hours = 8 × 60 = 480 min

60 × 500 = 30 000 drops (total)

30 000 ÷ 480 = 62.5 drops/min

= 63 drops/min (rounded)

Calculate the flow rate for 400 mL of Sodium Chloride 0.9% to be given using a standard drop set of

20 drops/mL over 5 hours

Total Drops = 20 × 400

= 8000 drops

Drip Rate = 8000 ÷ 300

= 27 drops/min

Calculate the volume of medication that will be administered over one and a half hours at a flow

rate of 33 drops per minute using a giving set of 20 drops per mL

Total Drops = 33 × 90

= 2970 drops

Volume = 2970 ÷ 20

= 148.5 mL

Calculate the volume of medication that will be administered using a giving set of 20 drops per mL

over 3 hours at a flow rate of 24 drops per minute.

Total Drops = 24 × 180

= 4320 drops

Volume = 4320 ÷ 20

= 216 mL

How long will it take to administer 270 mL of fluid at 28 drops/minute using a standard drop set of

20 drops/mL? Give your answer in hours and minutes.

Total Drops = 20 × 270

= 5400 drops

Time = 5400 ÷ 28

= 193 min

= 3 hours 13 min

Normal Saline is being administered 200 mL of fluid at 50 drops/minute using a 20 drops/mL giving

set. How long will it take to administer? Give your answer in hours and minutes.

Total Drops = 20 × 200

= 4000 drops

Time = 4000 ÷ 50

= 80 min

= 1 hour 20 min

How much fluid is administered over 45 minutes at an infusion rate of 18 drops/min using a

standard drop set of 20 drops/mL.

Total Drops = 18 × 45

= 810 drops

Volume = 810 ÷ 20

= 40.5 mL

Half a litre of saline needs to be administered over four hours. Calculate the flow rate using a

standard drop set of 20 drops per mL.

Total Drops = 20 × 500

= 10 000 drops

Drip Rate = 10 000 ÷ 240

= 42 drops/min

A patient is receiving fluid using a drip at a rate of 42 drops/min with a 20 drops/mL giving set. How

long will the last 400 mL take? Give your answer in hours and minutes.

Total Drops = 20 × 400

= 8000 drops

Time = 8000 ÷ 42

= 190 min

= 3 hours 10 min

How many millilitres of fluid will be administered over 90 minutes with a giving set of 20 drops per

millilitre at a drip rate of 28 drops per min?

Total Drops = 28 × 90

= 2520 drops

Volume = 2520 ÷ 20

= 126 mL

350 mL of fluid is administered over three hours. Calculate the flow rate using a standard drop set of 20 drops/mL.

Total Drops = 20 × 350

= 7000 drops

Drip Rate = 7000 ÷ 180

= 39 drops/min

A patient receives saline by drip at a rate of 28 drops/min with a standard giving set. How long will

the last 200 mL take? Give your answer in hours and minutes.

Total Drops = 20 × 200

= 4000 drops

Time = 4000 ÷ 28

= 143 min

= 2 hours 23 min