A client who wants to quit smoking has a new prescription for varenicline [Chantix]. The nurse will instruct the client to notify the provider immediately with which of the following?

The correct answer is D: Mood swings, depression, or suicidal ideation. Varenicline is a medication used to help people quit smoking by reducing the pleasure associated with nicotine. It can sometimes lead to changes in mood, including depression and even suicidal thoughts. Therefore, it is crucial for the client to notify the provider immediately if they experience any mood swings, depression, or thoughts of suicide while taking varenicline. This is because these symptoms can be serious and require prompt medical attention to ensure the client's safety. Choices A, B, and C are common side effects of varenicline but are not typically considered urgent enough to warrant immediate notification of the provider.