PRESCRIPTION WRITING 107 



oleunij genitive oh-i, of oil ; theohroma, genitive theohrom- 

 atis, of theobroma. The quantity of cacao butter may be 

 safely left to the discretion of the pharmacist. We will 

 multiply the dose by ten, to make ten suppositories. 



lodoformi gr.v. 



Extract! belladonnse radicis gr.ii.ss. 



Olei theobromatis Q.S. 



Misce et fiant suppositoria x. 

 Translated: Mix and let there be made suppositories x. 

 (Abbreviated) M. et f. suppos. x. 



Sig. Introduce one into the bowel every 4 hours. 



John Smith. 



In writing prescriptions for ointments the degree of 

 dilution of the medicinal substance, or substances, must be 

 determined. In case the dilution is done in percentage, the 

 metric system is particularly useful. A five-per-cent. oint- 

 ment of the yellow oxide of mercury is of value in some 

 cases of conjunctivitis. We will write for 5 Gm. 



The Latin for yellow oxide of mercury is hydrargyrum 

 oxidum flavurn; hydrargyrum^ genitive hydrargyr-% of 

 mercury ; oxidum^ genitive oxid-iy of oxide ; flavurn^ genitive 

 flavi, of yellow. 



The excipient will- be simt)le ointment. Latin for simple 

 ointment is unguentum^ genitive unguent-iy of ointment. If 

 we order 5 gm. of simple ointment we can determine the 

 amount of mercury necessary to form a 5-per-cent. prepara- 

 tion with it by simply moving the decimal line forward two 

 places, .05, which will give a 1-per-cent. ointment of mer- 

 cury ; and then, by multiplying by 5, .05 X 5 = .25, we 

 secure a 5-per-cent. ointment. 



Solids in Gm. Liquids in Cc. 



Hydrargyri oxidi flavi 25 



Unguenti , . 5 



Misce et fiat unguentum. 

 Translated : Mix and let there be made an ointment. 

 (Abbreviated) M. et f. ung. 



Sig. Use externally. John Smith. 



