Question

Physician order states: Administer Verapamil 125 mg/100 mL IV to infuse at a rate of 20 mg/hr. Calculate the IV flow rate: ______________________________

A 250 mg/100 mL solution is to infuse via IV at 30 mg/hr. Calculate the IV flow rate:

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A 10 mg/250 mL solution is to infuse via IV at 20 mcg/min. Calculate the IV flow rate:

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Answer 1

1). The given dose is, Verapamil 125 mg/100 mL IV

IV infusion rate is = 20 mg/hr

125 mg is present in 100 mL, so 20 mg is present in 16 mL (= 20*100/125)

Thus, the flow rate is, 16 mL per hour (delivers 20 mg per hour)

2). The given dose is, 250 mg/100 mL IV

IV infusion rate is = 30 mg/hr

250 mg is present in 100 mL, so 30 mg is present in 12 mL (= 30*100/250)

Thus, the flow rate is, 12 mL per hour (delivers 30 mg per hour)

3). The given dose is, 10 mg/250 mL IV

IV infusion rate is = 20 mcg/min or 1.2mg/hour (since 1 hour = 60 minutes)

10 mg is present in 250 mL, so 1.2 mg is present in 30 mL (= 1.2*250/10)

Thus, the flow rate is, 30 mL per hour or 0.5 mL per minute (delivers 20 mcg per minute)