Injectable Medications Questions and
Answers | Latest Version | 2025/2026 |
Correct & Verified
How do you calculate the volume to administer using the Desired Over Have method?
✔✔ Multiply the desired dose by the quantity and divide by the dose on hand (Desired ×
Quantity ÷ Have)
If the order is 250 mg and the vial contains 500 mg in 2 mL, how many mL will you administer?
✔✔ 1 mL
What is the formula to find the amount of injectable medication to give if the dose on hand is
given per tablet or vial?
✔✔ (Desired dose ÷ Dose on hand) × Quantity
How many mL will you administer for a prescribed dose of 75 mg if the medication label states
150 mg per 3 mL?
✔✔ 1.5 mL
1
,When using the Desired Over Have formula, what does "Have" represent?
✔✔ The amount of medication available in the quantity given
A physician orders 0.8 mg of medication. You have a vial labeled 2 mg/mL. How much will you
give?
✔✔ 0.4 mL
Why is it important to verify the concentration units when calculating injectable medication
doses?
✔✔ To ensure accurate conversion and prevent dosing errors
If a medication order reads 1.5 units and the vial contains 3 units per 0.5 mL, how many mL
should be administered?
✔✔ 0.25 mL
The prescribed dose is 120 mg, and the medication available is 80 mg per 2 mL. How many mL
will you give?
✔✔ 3 mL
2
,What is the first step when using the Desired Over Have formula?
✔✔ Identify the desired dose and the dose available
If the order is for 10 mg and the medication comes as 25 mg per 5 mL, how many mL do you
administer?
✔✔ 2 mL
How do you calculate the dose if you need 0.5 mg and the vial contains 1 mg/mL?
✔✔ 0.5 mL
A client is prescribed 3 mL of medication containing 50 mg/mL. How much medication in mg
will the client receive?
✔✔ 150 mg
If the dose ordered is 5 mg and the label reads 2.5 mg per mL, what is the volume to inject?
✔✔ 2 mL
3
, How would you calculate the volume to inject if the dose ordered is 0.75 mg and the vial
contains 1.5 mg/mL?
✔✔ 0.5 mL
Why is the Desired Over Have method useful in nursing medication calculations?
✔✔ It helps convert prescribed doses to the volume or quantity to administer based on available
medication strength
If the dose ordered is 600 mg, and the vial contains 250 mg per 5 mL, how many mL do you
give?
✔✔ 12 mL
How much medication will you administer if the order is 40 units and the insulin syringe holds
100 units per mL?
✔✔ 0.4 mL
If the prescribed dose is 0.25 mg and the medication comes in 0.5 mg per 1 mL, what is the
correct volume to give?
✔✔ 0.5 mL
4
Answers | Latest Version | 2025/2026 |
Correct & Verified
How do you calculate the volume to administer using the Desired Over Have method?
✔✔ Multiply the desired dose by the quantity and divide by the dose on hand (Desired ×
Quantity ÷ Have)
If the order is 250 mg and the vial contains 500 mg in 2 mL, how many mL will you administer?
✔✔ 1 mL
What is the formula to find the amount of injectable medication to give if the dose on hand is
given per tablet or vial?
✔✔ (Desired dose ÷ Dose on hand) × Quantity
How many mL will you administer for a prescribed dose of 75 mg if the medication label states
150 mg per 3 mL?
✔✔ 1.5 mL
1
,When using the Desired Over Have formula, what does "Have" represent?
✔✔ The amount of medication available in the quantity given
A physician orders 0.8 mg of medication. You have a vial labeled 2 mg/mL. How much will you
give?
✔✔ 0.4 mL
Why is it important to verify the concentration units when calculating injectable medication
doses?
✔✔ To ensure accurate conversion and prevent dosing errors
If a medication order reads 1.5 units and the vial contains 3 units per 0.5 mL, how many mL
should be administered?
✔✔ 0.25 mL
The prescribed dose is 120 mg, and the medication available is 80 mg per 2 mL. How many mL
will you give?
✔✔ 3 mL
2
,What is the first step when using the Desired Over Have formula?
✔✔ Identify the desired dose and the dose available
If the order is for 10 mg and the medication comes as 25 mg per 5 mL, how many mL do you
administer?
✔✔ 2 mL
How do you calculate the dose if you need 0.5 mg and the vial contains 1 mg/mL?
✔✔ 0.5 mL
A client is prescribed 3 mL of medication containing 50 mg/mL. How much medication in mg
will the client receive?
✔✔ 150 mg
If the dose ordered is 5 mg and the label reads 2.5 mg per mL, what is the volume to inject?
✔✔ 2 mL
3
, How would you calculate the volume to inject if the dose ordered is 0.75 mg and the vial
contains 1.5 mg/mL?
✔✔ 0.5 mL
Why is the Desired Over Have method useful in nursing medication calculations?
✔✔ It helps convert prescribed doses to the volume or quantity to administer based on available
medication strength
If the dose ordered is 600 mg, and the vial contains 250 mg per 5 mL, how many mL do you
give?
✔✔ 12 mL
How much medication will you administer if the order is 40 units and the insulin syringe holds
100 units per mL?
✔✔ 0.4 mL
If the prescribed dose is 0.25 mg and the medication comes in 0.5 mg per 1 mL, what is the
correct volume to give?
✔✔ 0.5 mL
4
