Question

If you have ceftriaxone (Rocephin) 1 gram/4 milliliter (mL) on hand, what volume should be administered by injection when the order in the medical record prescribes ceftriaxone 250 milligrams intramuscularly?

A) 0.5 mL
B) 1 mL
C) 2 mL
D) 4 mL

Answer 1

To administer ceftriaxone 250 milligrams intramuscularly using ceftriaxone (Rocephin) 1 gram/4 milliliter (mL), a volume of 1 mL should be administered.

Step-by-step explanation:

To determine the volume of ceftriaxone (Rocephin) 1 gram/4 milliliter (mL) that should be administered when the order prescribes ceftriaxone 250 milligrams intramuscularly, we can use the formula:

Dose (in milligrams) = Volume (in milliliters) × Concentration (in milligrams per milliliter)

Rearranging the formula, we have:

Volume (in milliliters) = Dose (in milligrams) / Concentration (in milligrams per milliliter)

Plugging in the values, we get:

Volume = 250 milligrams / (1 gram/4 milliliter) =

1 mL