conversion question

[JerryPharmD]

Advertisement - Members don't see this ad

What is the appropriate grams to one ounce ratio for calculations in compounding? I'm curious if your school uses a different one than mine.

 

[DrugDealer]

What is the appropriate grams to one ounce ratio for calculations in compounding? I'm curious if your school uses a different one than mine.

I think it depends which system you are working with.

In the apothecary system, 1 oz = 31.1 g
In the avoirdupois system, 1 oz = 28.35 g

 

[sdn1977]

You asked specifically about compounding so I'll tell you - in the US you use the apothecary system in which an oz is 31.1Gm (in a practical sense it is 31Gm)

However...if you are a pharmacy student, you will eventually need to understand the relationship between avoirdupois & apothecary weight. The avoirdupois system is used by pharmacists to buy & sell medications OTHER THAN on prescription.

The apothecary system is used to dispense & compound prescriptions.

Check in Remington's for a good history & summary of how & why the two weights came into being. The Imperial system (British - perhaps Canadian....don't know???) is based on its own system which I think is strictly avoirdupois, but I can't be sure on this.

The USP adopted our standards in 1890 & they were reaffirmed in 1944.

So...for compounding - use apothecary (31.1G if you're in school....30G if you're not for 1oz).

 

[DrugDealer]

You are a fountain of knowledge, SDN1977! I always enjoy your posts!