Calculate the amount to administer. Ordered: Acetylcysteine 400 mg q4h inhalation On hand: Acetylcysteine 20% solution

Desired dose = 400 mg. Determine the available concentration. A 20% solution = 20 g per 100 mL = 20,000 mg per 100 mL So the concentration is: 20,000 mg/100 mL =200 mg/mL Calculate the volume to administer per dose. Volume (mL) = Desired dose (mg) / Concentration (mg/mL) = 400 mg / 200 mg/mL = 2 mL.