A client is to receive Phenobarbital elixir 60 mg PO. The drug is supplied 15 mg per 5mL. How many mLs should the nurse administer? (Use a preceding zero if it applies. Do not use trailing zeros. Round to the nearest whole number)

Determine the concentration of the Phenobarbital elixir: The drug is supplied as 15 mg per 5 mL. Concentration = 15 mg / 5 mL = 3 mg/mL Calculate the volume (in mL) needed for a 60 mg dose: Use the concentration as a conversion factor: Volume (mL) = Dose (mg) / Concentration (mg/mL) Volume (mL) = 60 mg / 3 mg/mL = 20 mL