Which vitamin will reduce the therapeutic effects of levodopa?
B6
A
E
K
C
The Correct Answer is A
A. B6 (Pyridoxine):
Vitamin B6, also known as pyridoxine, is known to reduce the therapeutic effects of levodopa. It competes with levodopa for absorption in the gastrointestinal tract and can decrease the amount of levodopa that reaches the brain, thereby diminishing its effectiveness in treating Parkinson's disease symptoms.
B. A (Retinol):
Vitamin A, also known as retinol, is not typically associated with reducing the therapeutic effects of levodopa. Vitamin A plays important roles in vision, immune function, and cellular communication, but it does not interact with levodopa in a way that affects its therapeutic efficacy.
C. E (Alpha-Tocopherol):
Vitamin E, also known as alpha-tocopherol, is an antioxidant that plays a role in protecting cells from oxidative damage. While vitamin E supplementation is sometimes used in Parkinson's disease management for its potential neuroprotective effects, it is not known to reduce the therapeutic effects of levodopa.
D. K (Phylloquinone):
Vitamin K, also known as phylloquinone, is primarily involved in blood clotting and bone metabolism. It does not interact with levodopa in a way that reduces its therapeutic effects.
E. C (Ascorbic Acid):
Vitamin C, also known as ascorbic acid, is not known to reduce the therapeutic effects of levodopa. While vitamin C has various roles in the body, including antioxidant activity and immune function support, it does not interfere with levodopa absorption or efficacy.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Orthostatic hypotension:
Orthostatic hypotension, a sudden drop in blood pressure when standing up, is a potential adverse effect of levodopa therapy. This can lead to dizziness and increase the risk of falls, thus supporting the nursing diagnosis Risk for Injury.
B. Nausea and vomiting:
Nausea and vomiting are common side effects of levodopa therapy. While they can cause discomfort and dehydration, they are less directly related to the risk of physical injury compared to orthostatic hypotension.
C. Anorexia and depression:
Anorexia (loss of appetite) and depression can occur as adverse effects of levodopa therapy. While they can affect the patient's overall well-being and quality of life, they are not directly associated with an increased risk of physical injury.
D. Tachycardia and palpitations:
Tachycardia (rapid heart rate) and palpitations are less common adverse effects of levodopa therapy. While they may indicate cardiovascular issues, they are not typically associated with a direct risk of physical injury.
Correct Answer is C
Explanation
A. "I will notify my provider before taking any other medications."
This statement demonstrates understanding of the importance of consulting the provider before taking any other medications. It is correct because phenytoin may interact with other drugs, so notifying the provider is essential to avoid potential interactions.
B. "I have made an appointment to see my dentist next week."
This statement indicates that the client understands the importance of dental care while taking phenytoin. Phenytoin can cause gum overgrowth (gingival hyperplasia), so regular dental check-ups are recommended to monitor oral health. This statement is correct.
C. "I will take this medication with meals."
This statement suggests that the client plans to take phenytoin with meals. However, phenytoin should generally be taken on an empty stomach to enhance absorption, unless gastrointestinal upset occurs. Therefore, this statement indicates a need for further teaching.
D. "I'll be glad when my seizures stop so I can quit taking this medicine."
This statement reflects a misconception about the management of epilepsy. Phenytoin is typically used as a long-term treatment to prevent seizures, not as a short-term solution to stop seizures. Therefore, this statement indicates a need for further education about the chronic nature of epilepsy and the need for ongoing medication adherence.
E. “I’ll take this medication before meals.”
This statement correctly indicates the timing of phenytoin administration before meals. Taking phenytoin before meals helps enhance absorption and minimize the risk of gastrointestinal side effects. Therefore, this statement is correct.
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