Correct Answer: B

Rationale: Dry mouth is a common adverse effect associated with clonidine use. Clonidine is known to cause xerostomia (dry mouth) due to its effect on reducing salivary flow. Monitoring for dry mouth is important as it can lead to oral health issues and discomfort for the client.

Correct Answer: B

Rationale: Dry mouth is a common adverse effect associated with clonidine use. Clonidine is known to cause xerostomia (dry mouth) due to its effect on reducing salivary flow. Monitoring for dry mouth is important as it can lead to oral health issues and discomfort for the client.

Correct Answer: B

Rationale: Atenolol is a beta-blocker that can cause bradycardia, leading to a decreased heart rate. Monitoring heart rate regularly is essential to detect any significant decreases promptly and seek medical attention. While other choices may be relevant to the client's overall health, monitoring heart rate is the priority instruction due to the nature of Atenolol's effects.

Correct Answer: C

Rationale: Methylnaltrexone is an opioid antagonist used to treat severe constipation unresponsive to laxatives in opioid-dependent clients. It functions by blocking the mu opioid receptors in the gastrointestinal tract, helping alleviate constipation associated with opioid use.

Correct Answer: A

Rationale: Hyponatremia is a critical adverse effect associated with hydrochlorothiazide use. This medication is a diuretic that can lead to excessive loss of sodium and water from the body, potentially causing low sodium levels and resulting in hyponatremia. Monitoring for signs and symptoms of hyponatremia, such as confusion, headache, weakness, and muscle cramps, is essential to prevent serious complications.