If a drug has a concentration of 20 mg/mL, how many milliliters would you need for a 100 mg dose?

To determine how many milliliters are needed for a 100 mg dose of a drug with a concentration of 20 mg/mL, you can use the formula:

Volume (mL) = Desired Dose (mg) / Concentration (mg/mL).

Substituting the known values into the formula:

Volume (mL) = 100 mg / 20 mg/mL = 5 mL.

Therefore, 5 mL is required to achieve a 100 mg dose.

This calculation shows that for every milliliter, there are 20 mg of the drug. To find out how much is needed for 100 mg, the method taken was simple division to isolate the volume. Thus, the rightly calculated answer indicates the necessary amount of liquid needed to reach the dosage required.