is this correct?
Ordered: Vistaril 10 mg p.o. q.i.d.
On Hand: Vistaril 25 mg per 5 mL
Label:
Amount to administer:
p.o. = by mouth
q.i.d. = four times a day
25:5::10:x
x= (10*5)/25 = 50/25 = 2
Give 2 ml four times a day
Yes, your calculation is correct. To determine the amount to administer, you used a ratio calculation. The ratio 25:5 represents the concentration of Vistaril, with 25 mg of Vistaril in every 5 mL of solution. By setting up the ratio with this information, you can calculate the unknown quantity, x, which represents the amount to administer.
To do this, you multiplied the known quantity of Vistaril desired (10 mg) by the volume of the solution on hand (5 mL), and then divided by the concentration of the solution (25 mg). This calculation gives you the amount of solution needed to administer the desired dose, which in this case is 2 mL.
Therefore, the correct amount to administer is 2 mL, four times a day.