A pharmacist is asked to compound 60 ml of an isotonic eye drop. drug x (a liquid with an e-value of 0.33) and sodium chloride w

Question

2 years ago

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ill be used to prepare a final concentration of 1:500 (w/v). how many milligrams of sodium chloride must be added to make the eye drops isotonic?

1 answer:

Setler79 [48] · Answer 1 · 2022-06-08T21:57:12+03:00

3 0

The correct answer is 500mg.

First convert the ratio strength to a percentage(0.2%).

Drug X accounts for 0.0396 g of NaCl.

It would require 0.54 g of NaCl if that was all we were using.

Lastly, 0.54 g - 0.0396 = ~ 0.5 g NaCl ( or 500 mg, rounded as per the instructions ).