To deliver a 1 g dose, the prepared solution contains 500 mg per 2 mL. How many milliliters are required?

To deliver a 1 g dose, the prepared solution contains 500 mg per 2 mL. How many milliliters are required?

• A. 2 mL
• B. 6 mL
• C. 8 mL
• D. 4 mL

Answer: (D)

The amount of drug per milliliter is found by dividing the given amount by the volume: 500 mg in 2 mL equals 250 mg per mL. To deliver 1 gram (1000 mg), divide 1000 mg by 250 mg/mL, which gives 4 mL. A quick cross-check: 4 mL × 250 mg/mL = 1000 mg, so 4 mL is the correct volume.

The amount of drug per milliliter is found by dividing the given amount by the volume: 500 mg in 2 mL equals 250 mg per mL. To deliver 1 gram (1000 mg), divide 1000 mg by 250 mg/mL, which gives 4 mL. A quick cross-check: 4 mL × 250 mg/mL = 1000 mg, so 4 mL is the correct volume.