. An order calls for 250mg tablet to be administered by mouth twice daily for 3 days. Your pharmacy has run out of tablets, but you have 50mg/​2ml solution of the same drug available. How many ml of this solution should you dispense for the order?

Answer 1

To calculate how many mL of the 50 mg/2 mL solution you need to dispense for the order, follow these steps:

1. Determine the total dosage required:

   • The order specifies 250 mg to be taken twice daily for 3 days.
   • Total dosage = 250 mg × 2 times/day × 3 days = 1500 mg.

2. Determine the concentration of the solution:

   • The concentration of the solution is 50 mg/2 mL.
   • This can also be expressed as 25 mg/mL (because 50 mg ÷ 2 mL = 25 mg/mL).

3. Calculate the total volume of the solution needed:

   • To find out how many mL of the solution is needed to get 1500 mg, use the concentration of the solution:
   • Volume needed (mL) = Total dosage (mg) ÷ Concentration (mg/mL).
   • Volume needed (mL) = 1500 mg ÷ 25 mg/mL = 60 mL.

Thus, you should dispense 60 mL of the 50 mg/2 mL solution for the order.