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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

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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

## Dosage strengths calculations

A prescription medication comes in tablets form with dosage strengths of 5 mg, 10 mg, 20 mg, 40 mg, and 80 mg. Determine the best combination for each dose. (This is not time-release medication.) please show work if possible.
1. 60 mg daily dosage, to be given in divided doses tid.
2. 15 mg daily dosage, to be given as a single dose daily.
3. 100 mg daily dosage, to be given in divided doses qid.
4. 90 mg daily dosage, to be given in divided doses bid.
5. 90 mg daily dosage, to be given in divided doses tid.

Estimate the correct dosage (number of tablets or capsules) without working out the math.
6. On hand is capsule containing 100 mg; 300 mg is ordered.
7. On hand is a scored tablet containing 500 mcg; 250 mcg is ordered.
8. On hand is a scored tablet containing gr ¼; gr ½ is ordered.
9. On hand is a scored tablet containing 8 mg; 12 mg is ordered.
10. On hand is a capsule containing 325 mg; 650 mg is ordered.

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