Correct Answer: A

Rationale: Bradycardia is a common sign of Digoxin toxicity. Digoxin, a medication used to treat heart conditions, can lead to toxicity manifesting as bradycardia. Monitoring the client's heart rate closely is crucial to detect potential toxicity early and prevent complications.

Correct Answer: B

Rationale: The priority adverse effect to report when a child is taking Desipramine is suicidal thoughts. Desipramine can lead to an increased risk of suicidal thoughts and behaviors. The nurse should emphasize to the parents the importance of monitoring the child for any signs of worsening depression or suicidal ideation. Prompt reporting of such symptoms can help prevent harm to the child.

Correct Answer: A

Rationale: St. John's wort should be avoided by clients taking Warfarin as it can reduce the medication's effectiveness. The nurse should also advise the client to avoid other supplements that may interact with Warfarin, such as garlic and ginseng.

Correct Answer: B

Rationale: The correct administration of Nitroglycerin sublingual tablets involves taking one tablet at the onset of chest pain and repeating every 5 minutes for up to three doses. If the pain persists after three doses, emergency medical services should be contacted for further evaluation and management.

Correct Answer: C

Rationale: Sucralfate can interfere with the absorption of phenytoin. To prevent this interaction, the client should allow a 2-hour interval between taking sucralfate and phenytoin. This interval helps ensure that each medication is absorbed effectively without affecting the other's absorption.