Correct Answer: B

Rationale: Coarse tremors are a common sign of Lithium toxicity. It is important for healthcare providers to monitor for this symptom as it indicates a potential overdose of the medication. Severe hypertension, constipation, and muscle spasms are not typically associated with Lithium toxicity.

Correct Answer: C

Rationale: The correct answer is C. Erythromycin should be taken on an empty stomach with a full glass of water to increase absorption. Taking it with milk (choice A) or an antacid (choice D) can interfere with its absorption. Avoiding direct sunlight (choice B) is not directly related to the administration of erythromycin.

Correct Answer: B

Rationale: The nurse should instruct the client to report fever when starting rituximab therapy. Fever can be a sign of infection, which is a potential complication associated with rituximab. Early detection and treatment of infections are important to ensure the client's safety and well-being.

Correct Answer: B

Rationale: Pressing on the nasolacrimal duct, located near the inner corner of the eye, blocks the lacrimal punctum and prevents the medication from entering the systemic circulation. This technique helps to ensure the medication stays localized in the eye, enhancing its therapeutic effect while minimizing systemic side effects.

Correct Answer: A

Rationale: Bradycardia is a common sign of Digoxin toxicity. Digoxin can lead to toxicity, which can manifest as various signs and symptoms, including bradycardia. Monitoring the client's heart rate closely is crucial to detect and manage potential toxicity early.