Correct Answer: A

Rationale: The nurse should instruct the client to use a soft-bristled toothbrush to prevent bleeding, which can occur due to chemotherapy-induced thrombocytopenia.

Correct Answer: B

Rationale: Neck spasms are indicative of acute dystonia, a serious side effect of Haloperidol that requires urgent intervention. Immediate reporting to the provider is crucial to address this potentially harmful condition and ensure the client's safety. Shuffling gait, drowsiness, and impotence are important to monitor but do not pose the same level of immediate risk as acute dystonia.

Correct Answer: B

Rationale: Ciprofloxacin should not be taken with dairy products due to the interference of calcium with medication absorption. To ensure optimal effectiveness, the client should be advised to take Ciprofloxacin 1 hour before or 2 hours after consuming dairy products.

Correct Answer: B

Rationale: The nurse should instruct the client to report fever as it can be an indication of an infection, which is a potential complication of rituximab therapy. Monitoring for fever is crucial to detect early signs of infection and prevent complications.

Correct Answer: C

Rationale: Warfarin interacts with vitamin K, not potassium. The client needs to be cautious with foods high in vitamin K, not potassium.