Question

1A. Chlorpromazine 40 mg IV q4h PRN emesis is ordered for a chemotherapy patient. You have only a bottle labeled Chlorpromazine 25 mg/mL. How many mL will you infuse every 4 hours if the patient is vomiting?

1B. Enoxaparin 40 mg SQ daily is ordered for a post-operative patient. You have only a pre-filled syringe labeled 120 mg / 0.8 mL. How many mL will you inject?

Answer 1

Answers :-

1A)40 mg Chlorpromazine has been advised to be given every 4 hours(q4h) as per needed(prn).

we have 25mg/ml labelled bottle.In 4 hours therefore, 40/25ml has to be given i.e. 1.6ml.

1B)Enoxaparin 40mg to be given subcutaneously(SQ).Syringe contains 120mg in 0.8ml.So 120mg present in 0.8ml,1mg in 0.8/120ml,So 40mg is present in (0.8/120)x40ml or 0.8/3 i.e 0.26ml.So ,0.26 ml to be injected.