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OPRA Pharmacokinetics and Pharmacodynamics QUESTION #3848
Question 1
Dopamine hydrochloride is available as $6.4\ \text{mg}/100\ \text{mL}$. The prescribed infusion rate is $5\ \mu\text{g/kg/min}$ for a $64$ kg patient. What volume per minute should be infused?
  • $0.2$ mL/min
  • $0.5$ mL/min
  • $2.5$ mL/min
  • $5.0$ mL/min✔️
Correct Answer Explanation
Required dose $= 5\ \mu\text{g/kg/min} \times 64\ \text{kg} = 320\ \mu\text{g/min}$. Concentration $= 6.4\ \text{mg}/100\ \text{mL} = 64\ \mu\text{g/mL}$. Volume $= \dfrac{320}{64} = 5\ \text{mL/min}$.