What volume of 1% lidocaine is needed to fulfill a 30 mg order?

To determine the volume of 1% lidocaine needed to fulfill a 30 mg order, it's essential to understand what a 1% solution means. A 1% solution contains 1 gram of the drug in 100 milliliters of solution.

First, convert 1 gram to milligrams for clarity:

1 gram = 1000 mg. Therefore, a 1% solution contains 1000 mg in 100 mL.

Next, calculate how much lidocaine is in 1 mL of this solution:

1000 mg / 100 mL = 10 mg/mL.

Now, to find the volume needed for a 30 mg dose, divide the desired dose by the concentration:

30 mg ÷ 10 mg/mL = 3 mL.

Thus, to fulfill a 30 mg order, 3 mL of the 1% lidocaine solution is required, making this the correct answer. This demonstrates an understanding of how to work with concentrations and dosages, which is critical in pharmacy practice.