Question

1. Phenobarbital 45 mg PO bid is ordered for a child with seizures weighing 35 lb. The recommended dosage is 8 mg/kg/24 hours, given daily or bid.

a. What is the child's weight in kilograms?

b. What is the safe 24-hour dosage range for this child?

c. Is the dosage ordered safe? (Prove mathematically.) Explain your action.

2.The physician orders 1000 mL Lactated Ringer’s to infuse at 125 mL/h for a postoperative patient. Tubing drop factor is 20 gtt/mL. Calculate the flow rate in drops per minute.

3.The recommended dose of Lasix for a child is 1 mg/kg/dose. The child’s weight is 77 lb. medication is supplied in 10 mg/mL.

a. The child’s weight is 77lbs/2.2=35kg

b. Calculate the safe dose for this child.

c. How many milliliters will be administered for each dose?

Answer 1

Answer 1 a : 15.87 kg

1 pound = 0.45 kg

35pound= 0.45* 35 = 15.87kg

ANSWER b : 126.9 mg/ 24 hours

Recommended dose = 8mg/kg/24 hours

Weight= 15.8kg

Therefore 8*15.87 = 126.9 (127) mg/ 24 hours

ANSWER c : YES, prescribed dose is safe

Doctor order = 45mg bd that is 45* 2= 90mg /day

Safe dose range = 126.9 mg / day

ANSWER 2 : 41.6 drops/ minute

Total solution = 1000 ml

Solution per hour = 125ml/ hour

time = 8 hours = 8*60 min = 480 minutes

Gtt/ ml = 20gtt/ ml

x = 1000*20/ 480

Rate flow = 41.6 drops/ minute

ANSWER 3 A : 35mg/ dose

WEIGHT 77KG / 35kg

Lasix recommended dose 1mg/kg/dose

Safe dose is 1* 35 = 35mg/ dose

ANSWER 3 B : 3.5 ml

Recommended dose 35mg/ dose

Dose in hand 10mg / ml

Total volume given= x

therefore 35* 1/ 10 = 3.5 ml