Answered

65. A patient presents a prescription for 450 milliliters of allopurinol 40 mg/mL oral suspension. Allopurinol is available from the manufacturer in an oral tablet form only. Using allopurinol 100 mg tablets, how many tablets will you need to pulverize and triturate to compound this prescription?
A. 90 tablets
B. 100 tablets
C. 125 tablets
D. 180 tablets
E. 250 tablets



Answer :

sqdancefan

Answer:

  D. 180 tablets

Step-by-step explanation:

You want the number of 100 mg tablets required to supply 40 mg/mL of drug in 450 mL of suspension.

Units

You want to combine the given numbers in such a way as to cancel the units you don't want, and end up with units of "tablets." It can be done like this:

  [tex]450\text{ mL}\times\dfrac{40\text{ mg}}{\text{mL}}\times\dfrac{1}{\left(\dfrac{100\text{ mg}}{\text{tablet}}\right)}=(450\times0.40)\text{ tablets}=\boxed{\text{180 tablets}}[/tex]

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