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# Math Calculations on Prescriptions Orders

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Hello, I need some help with some Pharmacy Math Calculations:

1. A physician orders an IV of Cefazolin (Ancef) 1g/50mL, IVPB q6h. The infusion can be given in 20 minutes. What rate will you set on the IV pump (mL/min)?_____________________

2. An IV infusion order is written for 0.3 L of D5W/0.45% NS to run over 12 hours. The drop factor on the IV is set to 12 gtt/mL. What is the flow rate in drops per minute? The equation should include conversion factors for volume and time so that the answer is in gtt/min.

3. Calculate the flow rate for an IV of 0.6L of Lactated Ringers solution in 24 hours if the drop factor for the tubing is 12 gtt/mL. The equation must include conversion factors for volume and time so that the answer is in gtt/min._________________

4. Rantidine is infused in a 0.5 L bag 1/2 NS for ulcer treatment. It runs at 30 drops per minute with infusion device set to deliver 16 drops per mL. How long will the infusion take to complete? (Round to the nearest minute.)___________________

5. A physician orders 400,000 U of penicillin V PO 16h for a staph infection. The dosage on hand contains 800,000/5 mL. Calculate the number of milliliters to administer the doctor's order.____________________

Thanks in advance for your assistance and expertise regarding this matter, I just want to make sure I have the right answers.

https://brainmass.com/health-sciences/issues-in-health-care-delivery/math-calculations-on-prescriptions-orders-302904

#### Solution Preview

Hope the following helps. Let me know if you need further explanation.
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1.A physician orders an IV of Cefazolin (Ancef) 1g/50mL, IVPB q6h. The infusion can be given in 20 minutes. What rate will you set on the IV pump (mL/min)?_____________________

Formula:
Volume
--------- = PUMP RATE
Time

50
---- = 2.5 ml/min
20

2. An IV infusion order is written for 0.3 L of D5W/0.45% NS to run over 12 hours. The drop factor on the IV is set to 12 gtt/mL. What is the flow rate in drops per minute? The equation ...

#### Solution Summary

The solution includes step by step math calculations on 5 (five) different prescriptions /pharmacy related orders and infusion rates that a nurse should know.

\$2.19