The physician orders haloperidol (Haldol) 2 mg intramuscularly (IM) for a patient who is experiencing a psychiatric crisis. Haldol 5 mg/mL is available. How many milliliters should the nurse give?
a. 0.3 mL
b. 0.4 mL
c. 1 mL
d. 1.5 mL
ANS: B
Using the equation Dosage Required/Dosage Available x mL, the nurse should calculate 2 mg/5 mg ? 1 mL = 2/5 ? 1 = 0.4 mL.
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