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Calculating the volume for injections

Here is a simple way for calculating volume for injections:

or

Example:

A patient is prescribed cortisone 40mg I.M. Ampoules contain cortisone 50mg in 2ml. Calculate the volume required for injection.

Calculate the following:

What volume of drug should be drawn up?

1

Question 1

Pethidine 60 mg is ordered. Stock ampoules contain 100 mg in 2 ml. What volume of drug should be drawn up?

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2

Question 2

Papaveretum 15 mg is ordered. Ampoules are available in 20 mg/ml. What volume of drug should be drawn up?

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3

Question 3

An injection of morphine 8 mg. is ordered. An ampoule is available containing 10 mg/ml. What volume of drug should be drawn up?

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4

Question 4

Pethidine 80 mg is to be given I.M. Stock ampoules contain 100 mg in 2 ml. What volume of drug should be drawn up?

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5

Question 5

A patient is to receive an injection of gentamicin 60 mg. The ampoule contains 80 mg in 2ml. What volume of drug should be drawn up?

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6

Question 6

How much morphine solution should be drawn up for a 7.5 mg dose if a stock ampoule contains 15 mg in 1ml?

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7

Question 7

Heparin is available at a strength of 5000 units per 5ml. What volume is needed to give 800 units?

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8

Question 8

A patient is to be given 40mg of hydrocortisone. Stock ampoules contain 50mg in 2ml. What volume of drug should be drawn up?

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9

Question 9

60 mg of phenobarbitone is required. Available stock contains 125 mg in 5 ml. What volume of drug should be drawn up?

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10

Question 10

A stock bottle of heparin contains 25,000 units in 1 ml. What volume of drug will be required to give 15,000 units?

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