The doctor orders 250 mg of an antibiotic. The stock supply is a vial of 250 mg of the drug. Directions say to reconstitute with 1.7 mL of sterile water to yield 2 mL of the drug. How many milliliters will you give for the correct dose?
0.5 mL
250 mL
1.7 mL
2 mL
The Correct Answer is D
Given:
Ordered dose of antibiotic: 250 mg
Vial contains: 250 mg of antibiotic
Reconstitution volume: 1.7 mL of sterile water
Final volume after reconstitution: 2 mL
Step 1: Determine the concentration of the reconstituted solution:
Concentration (mg/mL) = Total amount of drug (mg) / Total volume (mL)
Concentration (mg/mL) = 250 mg / 2 mL
Concentration (mg/mL) = 125 mg/mL
Step 2: Calculate the volume to be administered:
Volume (mL) = Ordered dose (mg) / Concentration (mg/mL)
Volume (mL) = 250 mg / 125 mg/mL
Volume (mL) = 2 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A) Headache:
Headache is a known side effect of angiotensin receptor blockers (ARBs), such as losartan, valsartan, and olmesartan. These medications can cause headaches due to their vasodilatory effects, which can lead to changes in blood pressure and blood flow. While not everyone will experience this side effect, it is considered relatively common.
B) Dizziness:
Dizziness is another common side effect of ARBs. As ARBs cause vasodilation by blocking the angiotensin II receptors, they can lower blood pressure, leading to dizziness or lightheadedness, especially when standing up quickly. This is particularly noticeable in patients who are elderly or who are on multiple antihypertensive medications.
C) Constipation:
Constipation is not a typical side effect of angiotensin receptor blockers (ARBs). While some medications, especially calcium channel blockers and certain opioid analgesics, are more commonly associated with constipation, ARBs do not have this effect. ARBs primarily affect the vascular system and the kidneys, and constipation is not generally a side effect.
D) Hypotension:
Hypotension (low blood pressure) is a common side effect of ARBs. Since these medications relax blood vessels and decrease blood pressure by blocking the effects of angiotensin II, they can lead to a drop in blood pressure, particularly in the first few days of treatment or when starting therapy. This can result in symptoms like dizziness or fainting, especially when changing positions (postural hypotension).
Correct Answer is D
Explanation
Given:
Volume of fluid: 100 mL
Infusion time: 30 minutes
Drop factor: 60 gtt/mL
Formula:
Flow rate (gtt/min) = (Volume (mL) / Time (min)) x Drop factor (gtt/mL)
Step 1: Calculate the infusion rate in mL/min:
Infusion rate (mL/min) = Volume (mL) / Time (min)
Infusion rate (mL/min) = 100 mL / 30 min
Infusion rate (mL/min) = 3.33 mL/min
Step 2: Calculate the flow rate in gtt/min:
Flow rate (gtt/min) = Infusion rate (mL/min) x Drop factor (gtt/mL)
Flow rate (gtt/min) = 3.33 mL/min x 60 gtt/mL
Flow rate (gtt/min) = 200 gtt/min
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