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OPRA Pharmacokinetics and Pharmacodynamics QUESTION #3847
Question 1
A solution contains $200$ mg of dopamine in $500$ mL normal saline. What is the concentration of the solution in micrograms per mL?
  • $0.4\ \mu\text{g/mL}$
  • $2.5\ \mu\text{g/mL}$
  • $40\ \mu\text{g/mL}$
  • $400\ \mu\text{g/mL}$✔️
Correct Answer Explanation
$200\ \text{mg} = 200{,}000\ \mu\text{g}$. Concentration $= \dfrac{200{,}000}{500} = 400\ \mu\text{g/mL}$.