Question

**Dimensional Analysis***

1. Gr Vi=   Mg ( Record as a whole number )

2. The order reads promethazine (phenergan) 12.5 mg IM for nausea now.
The supply from the pharmacy is promethazine (pherergan) 50 mg/2 mL. How many mL would the nurse administer? ( Record using one decimal place)

3. The physician orders ampicillin 300 mg IM every 8 hours. The vital reads to add 4 mL of Normal saline to equal a concentration of 1g=5mL. How many mL will the nurse give? ( Record using one decimal place)

4. Infuse doxycyline 100mg IVPB mixed in 50 mL NS over 45 minutes. Calculate the IV rate.( Record using one decimal place)

5. Infuse 500 mL Dextrose 5% in Normal Saline over 2 hours. Drip factor 15 got/mL. Calculate the manual IV rate. (Record using one decimal place)

Answer 1

1 . 1 gr = 60 mg

2. Given data

Desired dose = 12.5 mg

Available dose = 50 mg/2 mL

Concentration = 2 mL

Formula for the dosage calculation is

Desired dose x Concentration = Dosage

Available dose

so, 12.5 mg / 50 mg x 2 mL = 0.5 mL

The answer is​​​ 0.5 mL

3. Given data

Desired dose = 300 mg

Available dose = 1 gm / 5 mL or 1000 mg / 5 mL

Concentration = 5 mL

Formula for the dosage calculation is

Desired dose x Concentration = Dosage

Available dose

300 mg / 1000 mg x 5 mL = 1.5 mL

The answer is 1.5 mL

4. Given data

Total amount of fluid to be infused = 50 mL

Time if infusion = 45 minutes

Formula for flow rate calculation is

Volume ( mL)= mL / minutes

Time ( minutes)

50 mL / 45 min = 1.11 mL / min

The answer is 1.1 mL / min

5. Given data

Total volume of the solution= 500 mL

Time = 2hr (2x60) or 120 minutes

Drop factor= 15 gtt/ mL

Formula for flow rate calculation is

Volume x drop factor = gtt / min

Time ( min)

500 / 120 x 15 = 62.5 gtt / min

The answer is 62 drops per minute