How many millilitres of adrenaline injection are needed to supply a 0.3 mg dose when the concentration is 100 micrograms per millilitre?

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Study for the Foundation Year Pharmacy – Clinical Practice Test. Prepare with detailed questions, step-by-step explanations, and test format insights. Enhance your readiness and confidence!

Multiple Choice

How many millilitres of adrenaline injection are needed to supply a 0.3 mg dose when the concentration is 100 micrograms per millilitre?

Explanation:
To work out how much volume to give, use dose = concentration × volume. Convert so the units match, then divide the dose by the concentration to get the volume. The dose is 0.3 mg, which is 300 micrograms. The concentration is 100 micrograms per millilitre, so each millilitre contains 100 micrograms. Volume needed = 300 micrograms ÷ 100 micrograms per millilitre = 3 millilitres. So the required volume is three millilitres. Quick check: the concentration can also be seen as 0.1 mg/mL; 0.3 mg ÷ 0.1 mg/mL = 3 mL.

To work out how much volume to give, use dose = concentration × volume. Convert so the units match, then divide the dose by the concentration to get the volume.

The dose is 0.3 mg, which is 300 micrograms. The concentration is 100 micrograms per millilitre, so each millilitre contains 100 micrograms.

Volume needed = 300 micrograms ÷ 100 micrograms per millilitre = 3 millilitres.

So the required volume is three millilitres. Quick check: the concentration can also be seen as 0.1 mg/mL; 0.3 mg ÷ 0.1 mg/mL = 3 mL.

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