Samantha Hudson a two-year-old child in the ER with parents at the bedside. She came in not feeling well, irritable, crying all night, and not eating or drinking. Orders: Vistaril 15 mg IM q4h, Stat x 1 for nausea. Available: Vistaril 50 mg/ml How many mL will you administer to Samantha now?

Given: Desired dose of Vistaril: 15 mg Concentration of Vistaril: 50 mg/mL Step 1: Set up the proportion: Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL) Step 2: Substitute the values: 15 mg / Volume = 50 mg/mL Step 3: Solve for the unknown volume: Volume = 15 mg / 50 mg/mL Step 4: Calculate the volume: Volume = 0.3 mL