a nurse is preparing to administer acetaminophen 650 mg po every 6 hr prn for pain the amount available is acetaminophen liquid 500 mg5 ml how many m

ATI RN

ATI Pharmacology

1. A patient is prescribed acetaminophen 650 mg PO every 6 hr PRN for pain. The available acetaminophen liquid is 500 mg/5 mL. How many mL should the nurse administer per dose?

A. 6.5 mL
B. 7 mL
C. 5 mL
D. 8 mL

Correct answer: A

Rationale: To calculate the volume to administer: (Desired dose / Concentration) = Volume to administer. In this case, (650 mg / 500 mg) x 5 mL = 6.5 mL. Therefore, the nurse should administer 6.5 mL of acetaminophen liquid per dose to provide the prescribed 650 mg of acetaminophen. Choice B, 7 mL, is incorrect because the correct calculation results in 6.5 mL. Choice C, 5 mL, is incorrect as it is the concentration of the acetaminophen liquid, not the final volume needed. Choice D, 8 mL, is incorrect because it does not reflect the accurate calculation based on the prescription and concentration.

2. A client has been prescribed an anticoagulant for atrial fibrillation. Which of the following instructions should the nurse include?

A. Take the medication with food to prevent nausea.
B. Avoid activities that may cause injury.
C. Monitor your heart rate daily before taking the medication.
D. Avoid alcohol while taking this medication.

Correct answer: B

Rationale: The correct instruction for a client prescribed an anticoagulant for atrial fibrillation is to avoid activities that may cause injury. Anticoagulants increase the risk of bleeding, so it is important to prevent situations that could lead to injury or trauma. Choice A is incorrect because anticoagulants are not typically affected by food intake. Choice C is not necessary for all anticoagulant medications, and heart rate monitoring is more relevant for other conditions. Choice D is not directly related to the action of anticoagulants and is not a priority instruction for this medication.

3. What is the therapeutic action of Phenytoin?

A. Antidiabetic
B. Anticonvulsant
C. Mood stabilizer
D. Antianxiety agent

Correct answer: B

Rationale: Phenytoin is primarily used as an anticonvulsant to prevent and control seizures. It works by stabilizing electrical activity in the brain, making it effective in managing conditions like epilepsy. Antidiabetic medications are used to regulate blood sugar levels, mood stabilizers help manage mood disorders, and antianxiety agents are used to reduce anxiety symptoms, none of which are the primary therapeutic action of Phenytoin.

4. When teaching a client about a new prescription for Celecoxib, which of the following information should the nurse include?

A. Increases the risk for a myocardial infarction
B. Decreases the risk of stroke
C. Inhibits COX-1
D. Increases platelet aggregation

Correct answer: A

Rationale: The nurse should educate the client that taking Celecoxib increases the risk of a myocardial infarction due to its suppression of vasodilation. Celecoxib belongs to the class of NSAIDs known to have cardiovascular risks, including an increased risk of heart attacks. Choice B is incorrect because Celecoxib does not decrease the risk of stroke. Choice C is incorrect because Celecoxib selectively inhibits COX-2 rather than COX-1. Choice D is incorrect because Celecoxib does not increase platelet aggregation; in fact, it inhibits platelet aggregation.

5. What is a severe adverse effect of warfarin?

A. Bleeding
B. Arrhythmias
C. Blurred vision
D. Bradycardia

Correct answer: A

Rationale: A severe adverse effect of warfarin is bleeding. Warfarin is an anticoagulant medication that works by inhibiting blood clotting factors, which can lead to an increased risk of bleeding. Excessive bleeding can occur internally or externally, and it is crucial for individuals taking warfarin to be aware of this potential complication and seek medical attention if they experience any signs of bleeding. Arrhythmias, blurred vision, and bradycardia are not typically associated with warfarin use, making them incorrect choices.