NURSING Dosage Calculation Practice Questions And
Answers Formula: D (desired dose) / H (amount on hand) *
V (vehicle)
A 15 month old weighing 20lbs needs Streptomycin Sulfate,
which is usually administered to adults as 1000mg as a daily IM
injection. What is the pediatric dosage if it is recommended to
administer 20mg/kg/day (maximum of 1g) of Streptomycin
Sulfate? Correct Answer 181.81mg (rounded: 182mg) per day
1) Convert 20lbs into kg
20/2.2 = 9kg
2) Multiply 9kg by recommended dose: 20mg/kg
20mg/kg * 9kg
= 181.81mg
A nurse is preparing to administer 10mg/kg/dose of a
medication to a child who weighs 28lbs. The amount available
of this medication is 120mg/5mL. How many mL should the
nurse administer? Correct Answer 5.3mL/dose
1) Convert 28lbs into kg
28/2.2 = 12.72kg
2) Desired dose / amount on hand * vehicle formula:
10mg/120mg * 5mL
= 0.083 * 5mL
= 0.416mL
3) Multiply answers from step 1 and 2
, 0.416mL/kg * 12.72 kg
= 5.3mL
A patient is ordered 0.25mg of digoxin. Digoxin is available in
0.125mg tablets. How much do you give? Correct Answer 2
tablets.
0.25mg/0.125mg * 1 tablet
= 2 * 1 tablet
= 2 tablets
A patient is ordered 0.4mg of Scopolamine SC q2h prn.
Scopolamine is available in 0.6mg/mL concentration. Each vial
contains 1mL. How much do you give per dose?
a) 0.24mL
b) 1.5mL
c) 0.1mL
d) 0.67mL Correct Answer D) 0.67mL
0.4mg/0.6mg * 1mL
= 0.67 * 1mL
= 0.67mL
A patient is ordered 0.5mg of hydromorphone SC q1h prn.
Hydromorphone is available in a 2mg/mL concentration
contained in 1mL vials. How much do you give per dose?
a) 0.25mL
b) 0.5mL
c) 0.75mL
Answers Formula: D (desired dose) / H (amount on hand) *
V (vehicle)
A 15 month old weighing 20lbs needs Streptomycin Sulfate,
which is usually administered to adults as 1000mg as a daily IM
injection. What is the pediatric dosage if it is recommended to
administer 20mg/kg/day (maximum of 1g) of Streptomycin
Sulfate? Correct Answer 181.81mg (rounded: 182mg) per day
1) Convert 20lbs into kg
20/2.2 = 9kg
2) Multiply 9kg by recommended dose: 20mg/kg
20mg/kg * 9kg
= 181.81mg
A nurse is preparing to administer 10mg/kg/dose of a
medication to a child who weighs 28lbs. The amount available
of this medication is 120mg/5mL. How many mL should the
nurse administer? Correct Answer 5.3mL/dose
1) Convert 28lbs into kg
28/2.2 = 12.72kg
2) Desired dose / amount on hand * vehicle formula:
10mg/120mg * 5mL
= 0.083 * 5mL
= 0.416mL
3) Multiply answers from step 1 and 2
, 0.416mL/kg * 12.72 kg
= 5.3mL
A patient is ordered 0.25mg of digoxin. Digoxin is available in
0.125mg tablets. How much do you give? Correct Answer 2
tablets.
0.25mg/0.125mg * 1 tablet
= 2 * 1 tablet
= 2 tablets
A patient is ordered 0.4mg of Scopolamine SC q2h prn.
Scopolamine is available in 0.6mg/mL concentration. Each vial
contains 1mL. How much do you give per dose?
a) 0.24mL
b) 1.5mL
c) 0.1mL
d) 0.67mL Correct Answer D) 0.67mL
0.4mg/0.6mg * 1mL
= 0.67 * 1mL
= 0.67mL
A patient is ordered 0.5mg of hydromorphone SC q1h prn.
Hydromorphone is available in a 2mg/mL concentration
contained in 1mL vials. How much do you give per dose?
a) 0.25mL
b) 0.5mL
c) 0.75mL
