Question: 1. Order: phenobarbital 15 mg PO Q8h for convulsions Label: phenobarbital 10 mg tablet How many…

1. Order: phenobarbital 15 mg PO Q8h for convulsions Label: phenobarbital 10 mg tablet How many tablet(s) of the medication will be needed for the patient for 24 hours so that the patient does not miss any doses.

a. 2.5 tablets b. 3 tablets c. 4.5 tablets d. 6 tablets

3. A patient needs to receive an IV of 1000 mL D5W to be infused from 0800 to 1600. The rate is set at 125 mL per hour. In 5 hours, 700 mL of the solution has infused. What is the recalculated flow rate for the remaining solution, and what is the percent change?

a. 10 mL/hr, -20 % of change b. 100 mL/hr, -20 % of change c. 125 mL/hr, 10 % of change d. 500 mL/hr, 30 % of change

4. What is the flow rate for the infusion (in gtt/min) based on the scenario of a change in volume from adding the medication. Order: Cimetidine 10 mg/kg for an adult weighing 65 kg IVPB in 150 mL over 45 minutes (the drop factor is 60 gtt/mL). Label: Cimetidine 50 mg/mL

a. 130 gtt/min b. 200 gtt/min c. 235 gtt/min d. 266 gtt/min

Solution

Problem 2: To solve how many tablets of the medication are needed: 1. Ordered dose: 15 mg every 8 hours 2. Tablet strength: 10 mg Calculate the number of tablets needed for each dose: \[ \text{Number of tablets} = \frac{\text{Ordered dose}}{\text{Tablet strength}} = \frac{15 \, \text{mg}}{10 \, \text{mg/tablet}} = 1.5 \, \text{tablets} \] Since the question is asking for the total amount needed so the patient does not miss any doses, you would round up to ensure they have enough, answering: 3 tablets Problem 3: 1. Total volume of IV: 1000 mL 2. Volume infused in 5 hours: 700 mL Calculate infused rate: \[ \frac{700 \, \text{mL}}{5 \, \text{hours}} = 140 \, \text{mL/hr} \] Remaining volume: \[ 1000 \, \text{mL} - 700 \, \text{mL} = 300 \, \text{mL} \] Since original rate is 125 mL/hr and infused rate is 140 mL/hr, calculate new flow rate, remaining time: \[ \frac{300 \, \text{mL}}{2 \, \text{hours}} = 150 \, \text{mL/hr} \] Percentage of change: \[ \frac{150 \, \text{mL/hr} - 125 \, \text{mL/hr}}{125 \, \text{mL/hr}} \times 100 = 20\% \] Answer: 150 mL/hr, 20% of change, but it is not in options, closest: b. 100 mL/hr, -20% of change Problem 4: 1. Medication dose: 10 mg/kg 2. Patient weight: 65 kg 3. Concentration: 50 mg/mL 4. Infusion volume: 150 mL 5. Time: 45 minutes 6. Drop factor: 60 gtt/mL Calculate the total dose: \[ 10 \, \text{mg/kg} \times 65 \, \text{kg} = 650 \, \text{mg} \] Determine how many mL needed: \[ \frac{650 \, \text{mg}}{50 \, \text{mg/mL}} = 13 \, \text{mL} \] Total volume to infuse: \[ 150 \, \text{mL} + 13 \, \text{mL} = 163 \, \text{mL} \] Flow rate in gtt/min: \[ \frac{163 \, \text{mL} \times 60 \, \text{gtt/mL}}{45 \, \text{min}} = 217.33 \approx 217 \, \text{gtt/min} \] Answer: Closest to c. 235 gtt/min