Which vitamin will reduce the therapeutic effects of levodopa?

Answer and Explanation

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.

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Free Nursing Study Resources

Correct Answer is B

Explanation

A. Excessive salivation:

Excessive salivation is not a common adverse effect of benztropine. Instead, anticholinergic medications like benztropine often cause dry mouth, which is more common than excessive salivation.

B. Difficulty voiding:

Difficulty voiding, or urinary retention, is a potential adverse effect of anticholinergic medications like benztropine. Anticholinergic drugs can cause relaxation of the detrusor muscle in the bladder, leading to urinary retention. Therefore, the nurse should instruct the client to report any difficulty or inability to urinate.

C. Diarrhea:

Diarrhea is not a common adverse effect of benztropine. Instead, anticholinergic medications like benztropine typically cause constipation due to their antimuscarinic effects on the gastrointestinal tract.

D. Slow pulse:

Slow pulse, or bradycardia, is not a common adverse effect of benztropine. Instead, anticholinergic medications like benztropine may cause tachycardia (increased heart rate) due to their effects on the autonomic nervous system.

A. 4 hours B. 1 hour C. 24 hours D. 8 hours

Correct Answer is A

Explanation

A. 4 hours:

This option indicates that tissue plasminogen activator (tPA) must be administered within 4 hours of the onset of stroke symptoms to be considered as a drug therapy option. tPA is a thrombolytic medication used to dissolve blood clots in ischemic stroke, and its effectiveness is highest when administered promptly after the onset of symptoms.

B. 1 hour:

Administering tPA within 1 hour of stroke onset would be extremely challenging and impractical. It typically takes time for patients to recognize stroke symptoms, seek medical attention, and undergo diagnostic evaluations before tPA administration. While time is of the essence in stroke treatment, 1 hour is too short of a timeframe for most patients to receive tPA.

C. 24 hours:

Administering tPA beyond 4.5 hours of stroke onset is generally contraindicated due to the increased risk of complications, including hemorrhagic transformation of the stroke. While there may be some extended time windows considered for certain patients under specific circumstances, such as those meeting eligibility criteria for extended thrombolytic therapy, 24 hours is outside the standard timeframe for tPA administration.

D. 8 hours:

While tPA administration within 8 hours of stroke onset may be feasible for some patients, it is beyond the standard recommended time window for optimal effectiveness. As mentioned earlier, tPA is most effective when administered within the first 3 to 4.5 hours after the onset of symptoms, with earlier administration associated with better outcomes.

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Which vitamin will reduce the therapeutic effects of levodopa?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is reinforcing teaching with a client who is taking benztropine to treat Parkinson's disease. The nurse should instruct the client to report which of the following findings as an adverse effect of the medication?

Correct Answer is B

Explanation

A few days after a Cerebral Vascular Accident, the patient's family asks the nurse if tissue plasminogen activator (tPA) is a drug therapy option now. The nurse's response based on the knowledge that this drug must be used within:

Correct Answer is A

Explanation

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