How man doses of vistaril 25 mg im are available in a 10 ml multidose vial of vistaril 50 mg ml?

A 10 mL multidose vial of Vistaril contains a concentration of 50 mg/mL. Therefore, the total amount of Vistaril in the vial is 10 mL × 50 mg/mL = 500 mg. To determine how many 25 mg doses are available, divide the total amount by the dose size: 500 mg ÷ 25 mg/dose = 20 doses. Thus, there are 20 doses of Vistaril 25 mg available in the vial.