Prescribing Maths and Conversions

Question 1

what is mcl

Answer 1

microliters

Question 2

What is meant by a 2% lignocaine solution?

Answer 2

2g/100ml w/v

Question 3

What is meant by 1% hydrocortisone?

Answer 3

1g/100g

Question 4

What is meant by Epinephrine 1:1000
What is it used for?

Answer 4

It is a solution => w/v => 1g/1000ml
Anaphylaxis (typically 0.3-0.5ml pre-filled)

Question 5

What is meant by Epinephrine 1:10,000
What is it used for?

Answer 5

It is a solution => w/v => 1g/10000ml
Cardiopulmonary arrests and resuscitation

Question 6

Enoxaparin is typically prepared in a solution of 10mg/0.1ml of water.
You have prescribed Enoxaparin for a 48 year old female weighing 60kg who has been diagnosed with a non-ST elevated myocardial infarction. The dose is 1.5mg/kg OD. What is the total volume delivered for this patient?
A: 1ml
B: 0.6
C: 0.3
D: 1.2
E: 0.9

Answer 6

1.5x48 = 72
10mg/0.1ml = 72/X = 0.72 => closest syringe that is higher to deliver the dose => E 0.9