Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
Ordered: Amoxicillin 250 mg tid for 7 days
On hand: See label
Note: Partial bottles are not dispensed.
How much amoxicillin should be dispensed?
This question is an excerpt from Nurse Dive's nursing test bank - Dosage calculation proctored exam (hellen fluid college). Take the full exam now
Full Explanation
Rationale:
- Calculate the total milligrams of amoxicillin needed for the entire prescription.
Given:
Ordered dose is 250 mg.
Frequency is three times a day (tid).
Duration is 7 days.
Total milligrams needed = 250 mg/dose × 3 doses/day × 7 days
= 5250 mg.
- Determine the concentration of the medication from the label.
The label states the concentration is 250 mg per 5 mL.
Concentration = 250 mg / 5 mL
= 50 mg/mL.
- Calculate the total volume in milliliters (mL) required for the prescription.
Total volume needed = Total milligrams needed / Concentration
= 5250 mg / 50 mg/mL
= 105 mL.
- Determine the amount to dispense based on the bottle size and dispensing instructions.
The label indicates that each reconstituted bottle contains 100 mL.
The total volume needed is 105 mL, which is more than what one 100 mL bottle contains.
The note states, "Partial bottles are not dispensed." Therefore, two bottles must be dispensed to provide the client with a full course of medication.
Amount to dispense = 2 bottles × 100 mL/bottle
= 200 mL.
Similar Questions
Ordered: Insulin lispro 24 units subcut 4 times daily, with meals and at bedtime, for 90 days.
On hand: 1,000 unit vials of insulin lispro
Note: Partial vials are not dispensed.
What is the amount to dispense?
A. 7 vials
B. 3 vials
C. 8 vials
D. 9 vials
Calculation: Calculate the total daily dose in units. Total daily dose = 24 units/dose × 4 doses/day = 96 units/day. Calculate the total units needed for the 90-day supply. Total units = 96 units/day × 90 days = 8640 units. Total units per vial = 1000 units. Calculate the number of vials needed. Vials needed = Total units / Units per vial = 8640 units / 1000 units/vial = 8.64 vials. Account for partial vials not being dispensed. Vials to dispense = 9 vials.
Full Explanation
Calculation:
- Calculate the total daily dose in units.
Total daily dose = 24 units/dose × 4 doses/day
= 96 units/day.
- Calculate the total units needed for the 90-day supply.
Total units = 96 units/day × 90 days
= 8640 units.
Total units per vial = 1000 units.
- Calculate the number of vials needed.
Vials needed = Total units / Units per vial
= 8640 units / 1000 units/vial
= 8.64 vials.
- Account for partial vials not being dispensed.
Vials to dispense = 9 vials.
Once reconstituted according to instructions, how much solution is contained in the bottle of Vantin?
Full Explanation
Based on the label provided, the amount of solution contained in the bottle of Vantin once reconstituted is 50 mL. The lable states (50 mL when mixed)
Calculate the amount to administer:____________ (Round decimal appropriately)
Ordered: Imitrex 8 mg subcut prn headache
On hand: Imitrex injection 6 mg/0.5 mL
Full Explanation
Desired dose = 8 mg.
Concentration of the available medication = 6 mg in 0.5 mL.
Concentration = 6 mg / 0.5 mL
= 12 mg/mL.
- Calculate the volume in milliliters (mL) to administer.
Volume (mL) = Desired dose (mg) / Concentration (mg/mL)
= 8 mg / 12 mg/mL
= 0.6666... mL.
- Rounding to the nearest hundredth
= 0.67 mL.