prescription compounding

prepare 8 mL of hydrocortisone solution with a concentration of 5 mg/mL from 100mg/2mL stock. how many mL of the stock hydrocortisone are needed?

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answer
by: Anonymous

First you need to find out the amount of drug in the 8 mL that you would need, at the concentration of 5 mg/1 mL

thus:

5 mg/1 mL= x mg / 8 mL

x=40 mg drug needed

then you take that and use the stock solution to find out how much volume would you need with that amount of drug:

100 mg/ 2 mL = 40 mg / x mL

x=0.8 mL

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