The healthcare provider prescribes penicillin G benzathine 1,800,000 units intramuscular (IM) for a client with a bacterial infection. The prefilled syringe is labeled, "Penicillin G benzathine 1,200,000 units/2 mL." How many mL should the nurse administer to this client? (Enter numerical value only, rounded to the nearest whole number.)

Here's how to calculate the volume (mL) of penicillin G benzathine the nurse should administer: 1. We know: Prescribed dose: 1,800,000 units (given by healthcare provider) Concentration of penicillin G benzathine in prefilled syringe: 1,200,000 units/2 mL (given on the syringe label) 2. We need to find: Volume to administer (mL) 3. Calculation: To find the volume to administer, we can divide the prescribed dose (units) by the concentration (units/mL) of the medication in the syringe. Volume (mL) = Prescribed dose (units) / Concentration (units/mL) Plug in the values: Volume (mL) = 1,800,000 units / (1,200,000 units/2 mL) Important note: We can rearrange the fraction with the concentration term because we are dividing by units/mL, which is equivalent to multiplying by mL/units. So, effectively, we are multiplying by the reciprocal of the concentration. Volume (mL) = 1,800,000 units x (2 mL / 1,200,000 units) Volume (mL) = 3 mL (rounded to the nearest whole number as requested) Therefore, the nurse should administer 3 mL of penicillin G benzathine intramuscularly.