A patient with a complicated medical history including hypertension, a-fib, and arthritis calls the health care provider's office to speak with a nurse about "all of these bruises I have all of a sudden." Which potential drug interaction should concern the nurse with these symptoms?

A. As requested by the patient.

Administering the drug only when requested by the patient may not provide adequate prophylaxis against chemotherapy-induced nausea and vomiting. These medications are often prescribed on a schedule to prevent symptoms rather than treating them reactively.

B. 1 hour after chemotherapy administration.

Waiting until 1 hour after chemotherapy administration may not cover the full period during which nausea and vomiting are likely to occur. The administration schedule for antiemetics is often more extended to provide better coverage.

C. The night before the treatment, the day of the treatment, and for 24 hours after the treatment.

This is the correct choice. Administering phenothiazine antiemetics according to this schedule helps ensure continuous coverage during the critical period when chemotherapy-induced nausea and vomiting are most likely to occur.

D. The day of treatment.

Administering the drug only on the day of treatment may not provide sufficient coverage for the entire duration when chemotherapy-induced nausea and vomiting can occur. Again, the schedule mentioned in option C is more comprehensive for prevention.

A. "I may experience urinary retention, dry mouth, and constipation."

This statement is accurate. Urinary retention, dry mouth, and constipation are common side effects of carbidopa-levodopa. The patient should be aware of these potential side effects and report them to the healthcare provider if they become problematic.

B. "I may feel dizzy at first, but this side effect will go away with time."

This statement is accurate. Dizziness is a common initial side effect of carbidopa-levodopa, and it often improves with continued use. The patient should be encouraged to report persistent dizziness to the healthcare provider.

C. "I should report nightmares and mental disturbances to my provider."

This statement is accurate. Nightmares and mental disturbances can be side effects of carbidopa-levodopa. The patient should report these symptoms to the healthcare provider for further evaluation and potential adjustments to the medication.

D. "I should take the drug with food to increase absorption."

This statement indicates a need for further teaching. Carbidopa-levodopa is best absorbed when taken on an empty stomach. Taking it with food, especially high-protein meals, can reduce its absorption. The patient should be instructed to take the medication at least 30 minutes before meals or one to two hours after meals for optimal effectiveness.