Drug suspension conversion

by wanda
(pittsburgh pa )

Cefaclor is a cephalosporin antibiotic used to treat bacterial infections. A physician has ordered: Cefaclor 450mg tid. The drug is available as a 7.5% suspension. What volume should be given for each dose?

A. 15mL

B. 12mL

C. 8mL

D. 6mL

how do you do these?

reply (by Keith) It's just a conversion:

7.5g
--------- - - = 7.5% (what your suspension is)
100mL

So,

7500mg - - - - - 450mg (What you need per dose)
--------- - - = --------
100mL - - - - - - - X

Solve for X