ATI Dosage Calculation and Safe
Medication Administration 3.0 -
Dosages by Weight | Questions and
Verified Answers (
Updates)
Question:
A nurse is preparing to administer valproic acid 45 mg/kg/day PO divided in
equal doses every 8 hours to a child who weighs 66 lb. Available is valproic
acid syrup 250 mg/5 mL. How many mL should the nurse administer per
dose?
Answer:
9 mL
Rationale:
1. 66/2.2 = 30 kg
2. (45 mg/kg/day) x (30 kg) = 1,350 mg/day
3. (1,350 mg/day) / (3 doses/day) = 450 mg/dose
4. 250 mg/5 mL = 450 mg/x mL
5. 250x = 2,250
6. x = 9 mL
,Question:
A nurse is preparing to administer amoxicillin 25 mg/kg/day PO divided in
equal doses every 8 hours to a preschooler who weighs 43 lb. Available is
amoxicillin suspension 250 mg/5 mL. How many mL should the nurse
administer per dose? (Round to the nearest tenth.)
Answer:
3.3 mL
Rationale:
1. 43/2.2 = 19.545 kg
2. (25 mg/kg/day) x (19.545 kg) = 488.636 mg/day
3. (488.636 mg/day) x (3 doses/day) = 162.878 mg/dose
4. 250 mg/5 mL = 162.878 mg/ x mL
5. 250x = 814.393
6. x = 3.2576 mL
7. x = 3.3 mL (rounded)
Question:
A nurse is preparing to administer midazolam IM to a client who is
preoperative and weighs 132 lb. The medication reference states the safe
dosage range is 0.07 to 0.08 mg/kg. What is the maximum safe dose the nurse
should expect to administer? (Round to the nearest tenth.)
Answer:
4.8 mg
, Rationale:
1. 132/2.2 = 60 kg
2. (0.08 mg/kg) x (60 kg) = 4.8 mg
Question:
A nurse is preparing to administer famotidine 0.5 mg/kg PO to a child who
weighs 50 lb. How many mg should the nurse administer per dose? (Round to
the nearest tenth.)
Answer:
11.4 mg
Rationale:
1. 50/2.2 = 22.727 kg
2. (0.5 mg/kg) x (22.727 kg) = x
3. x = 11.3636 mg
4. x = 11.4 mg (rounded)
Question:
A nurse is converting a toddler's weight from lb to kg. If the toddler weighs 20
lb 8 oz, what is the toddler's weight in kg? (Round to the nearest tenth.)
Answer:
9.3 kg
Medication Administration 3.0 -
Dosages by Weight | Questions and
Verified Answers (
Updates)
Question:
A nurse is preparing to administer valproic acid 45 mg/kg/day PO divided in
equal doses every 8 hours to a child who weighs 66 lb. Available is valproic
acid syrup 250 mg/5 mL. How many mL should the nurse administer per
dose?
Answer:
9 mL
Rationale:
1. 66/2.2 = 30 kg
2. (45 mg/kg/day) x (30 kg) = 1,350 mg/day
3. (1,350 mg/day) / (3 doses/day) = 450 mg/dose
4. 250 mg/5 mL = 450 mg/x mL
5. 250x = 2,250
6. x = 9 mL
,Question:
A nurse is preparing to administer amoxicillin 25 mg/kg/day PO divided in
equal doses every 8 hours to a preschooler who weighs 43 lb. Available is
amoxicillin suspension 250 mg/5 mL. How many mL should the nurse
administer per dose? (Round to the nearest tenth.)
Answer:
3.3 mL
Rationale:
1. 43/2.2 = 19.545 kg
2. (25 mg/kg/day) x (19.545 kg) = 488.636 mg/day
3. (488.636 mg/day) x (3 doses/day) = 162.878 mg/dose
4. 250 mg/5 mL = 162.878 mg/ x mL
5. 250x = 814.393
6. x = 3.2576 mL
7. x = 3.3 mL (rounded)
Question:
A nurse is preparing to administer midazolam IM to a client who is
preoperative and weighs 132 lb. The medication reference states the safe
dosage range is 0.07 to 0.08 mg/kg. What is the maximum safe dose the nurse
should expect to administer? (Round to the nearest tenth.)
Answer:
4.8 mg
, Rationale:
1. 132/2.2 = 60 kg
2. (0.08 mg/kg) x (60 kg) = 4.8 mg
Question:
A nurse is preparing to administer famotidine 0.5 mg/kg PO to a child who
weighs 50 lb. How many mg should the nurse administer per dose? (Round to
the nearest tenth.)
Answer:
11.4 mg
Rationale:
1. 50/2.2 = 22.727 kg
2. (0.5 mg/kg) x (22.727 kg) = x
3. x = 11.3636 mg
4. x = 11.4 mg (rounded)
Question:
A nurse is converting a toddler's weight from lb to kg. If the toddler weighs 20
lb 8 oz, what is the toddler's weight in kg? (Round to the nearest tenth.)
Answer:
9.3 kg
