The physician orders an injection of dexamethasone (Decadron) 6mg IM for a patient.
The available stock is dexamethasone 4mg/1ml in a 5ml multidose vial.
How many mLs of this medication will the nurse prepare?
75 mLs
5 mLs
6 mLs
15 mLs
The Correct Answer is C
The correct answer is Choice C.
Let’s go through the calculation step by step:
Step 1: Identify the order and the available medication. The order is for dexamethasone (Decadron) 6mg IM. The available stock is dexamethasone 4mg/1ml in a 5ml multidose vial.
Step 2: Determine the amount of medication needed to fulfill the order. This is done by dividing the ordered amount by the concentration of the available medication.
So, we have:
Step 2 Calculation=Concentration of Available MedicationOrdered Amount Substituting the given values: Step 2 Calculation=4 mg/mL6 mg Step 3: Perform the calculation.
Step 3 Calculation=1.5 mL
So, the nurse will prepare 1.5 mL of this medication.
Now, let’s discuss the rationales for each choice:
Choice A rationale:
75 mLs is not the correct amount. This would be a significantly larger dose than ordered, which could lead to an overdose.
Choice B rationale:
5 mLs is not the correct amount. This would also be a larger dose than ordered, which could lead to an overdose.
Choice C rationale:
1.5 mLs is the correct amount. This is calculated by dividing the ordered dose (6 mg) by the concentration of the available medication (4 mg/mL).
Choice D rationale:
15 mLs is not the correct amount. This would be a significantly larger dose than ordered, which could lead to an overdose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale:
Rifampin Rifampin is an antitubercular drug that is effective against all strains of Mycobacterium tuberculosis. It works by inhibiting the synthesis of RNA in the bacteria, preventing them from reproducing. However, it does not typically cause a decrease in visual acuity.
Choice B rationale:
Ethambutol Ethambutol is an antitubercular drug that can cause ocular toxicity in the form of visual field changes. It is known to induce toxic optic neuropathy, which is quite common and can lead to a decrease in visual acuity. Patients on Ethambutol therapy are advised to report any changes in visual acuity or eye discomfort immediately to their healthcare provider.
Choice C rationale:
Streptomycin Streptomycin is an aminoglycoside antibiotic used in the treatment of tuberculosis. It works by inhibiting protein synthesis in bacteria. While it can cause side effects such as ototoxicity and nephrotoxicity, it is not typically associated with a decrease in visual acuity.
Choice D rationale:
Isoniazid Isoniazid is a first-line antitubercular drug that works by inhibiting the synthesis of mycolic acids in the cell wall of Mycobacterium tuberculosis. While it can cause peripheral neuropathy, it is not typically associated with a decrease in visual acuity.
Correct Answer is C
No explanation
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