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.
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conversion question
Started by JerryPharmD
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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
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).
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).
You are a fountain of knowledge, SDN1977! I always enjoy your posts!
