help calculations

[jayde-89]

hello im curently doing my training to be a dispenser and im really struggling with my calculations my teacher has given me these practise ones could anyone explain it to me

1) calculate the quantity of each ingredient required to dispense the following prescription :
(then there is a picture of a script with the following)

chloral hydrate 200mg
blackcurrent syup 1 ml
water 0.1ml
syrup to 5ml

mitte 300ml

i dont understand how to work it out ?

and then the next one is even harder ,,,

2)calculate the quantity of each ingredient required to dispense the following prescription :
(then there is a picture of a script with the following)

salicylic acid 2%
yellow soft paraffin 20%
emulsifying oint 18%
hard paraffin 10%
coconut oil 50%

mitte 50g Apply ON

well with this one i dont understand the %s? ? could anyone help me and put it out how im suppose to do these ? many thanks

[giggsy]

seems like everyone is having problems with calculations. Which uni u at

[jayde-89]

ermmm im not at uni im doing my training on the job im training to dispense at the moment im only a hca

[johnep]

As I have previously said. Poor primary school teaching..
johnep

[Pharmanaut]

Originally Posted by jayde-89

hello im curently doing my training to be a dispenser and im really struggling with my calculations my teacher has given me these practise ones could anyone explain it to me

1) calculate the quantity of each ingredient required to dispense the following prescription :
(then there is a picture of a script with the following)

chloral hydrate 200mg
blackcurrent syup 1 ml
water 0.1ml
syrup to 5ml

mitte 300ml

i dont understand how to work it out ?

and then the next one is even harder ,,,

2)calculate the quantity of each ingredient required to dispense the following prescription :
(then there is a picture of a script with the following)

salicylic acid 2%
yellow soft paraffin 20%
emulsifying oint 18%
hard paraffin 10%
coconut oil 50%

mitte 50g Apply ON

well with this one i dont understand the %s? ? could anyone help me and put it out how im suppose to do these ? many thanks

chloral hydrate 200mg
blackcurrent syup 1 ml
water 0.1ml
syrup to 5ml

mitte 300ml

Think of it as a recipe and you are scaling it up to feed more people.
It tells you how much you need to make 5ml
To make 300ml you will need 300/5 times more which is 60.

Chloral hydrate 200mg x 60 = ??
Blackcurrant syrup 1ml x 60 = ??
Water 0.1ml x 60 = ??
Syrup to 5ml x 60 = 300ml

I'll leave you to fill in the amounts. Usually once the quantity goes above 1000mg switch to grams.

salicylic acid 2%
yellow soft paraffin 20%
emulsifying oint 18%
hard paraffin 10%
coconut oil 50%

mitte 50g Apply ON

First check all the ingredients add up to 100%, which they do.
Now you can do this two ways.
Hard way is to calculate each ingredient individually eg.
2% = 2/100 and multiply by the quantity you want (50g) 50*2/100
And repeat for the other amounts
The other way is to look at the amount required (mitte 50g).
So assume you are making 100g (100%) and that 50 is a half of 100, simply
half the quantities of the ingredients.

Now I'll let you do the sums.
Post your answers back here for marking by sunday evening, or lose out an a gold star.

[jayde-89]

question 1
200mg x 60 = 12g
1ml x 60 = 60mls
0.1ml x 60 = 6 mls
5ml x 60 = 300ml so they are the qauntity

[jayde-89]

question 2
2% = 2/100 x 50 = 1g
20%= 20/100 x 50 = 10g
18%= 18/100 x 50 = 9g
10%= 10/100 x 50 = 5g so these ae the quantitys needed ?

[Pharmanaut]

Originally Posted by jayde-89

question 1
200mg x 60 = 12g
1ml x 60 = 60mls
0.1ml x 60 = 6 mls
5ml x 60 = 300ml so they are the qauntity

Nice one.

Damn another script has just come in for the same thing, only its for 500ml.
What do we need this time?

[jayde-89]

Originally Posted by Pharmanaut

Nice one.

Damn another script has just come in for the same thing, only its for 500ml.
What do we need this time?

500/5=100

200ml x 100 = 20g
1ml x 100 = 100ml
0.1 x 100 = 10 ml
5ml x 100 = 500ml

[Pharmanaut]

Originally Posted by jayde-89

500/5=100

200ml x 100 = 20g
1ml x 100 = 100ml
0.1 x 100 = 10 ml
5ml x 100 = 500ml

Sorted.
No more chloral scripts today!
you did mean 200mg x 200 = 20g.