The client receives a prescription for niacin, and the nurse is providing education about the medication. What should the nurse teach the client about possible adverse effects of the medication?

A. "Sometimes this causes a full body rash when you first take it, but that doesn't necessarily mean you're allergic to it.": While niacin can cause skin reactions, a full-body rash is not a typical or common side effect. The primary skin reaction is flushing, not a rash. B. "You need to be aware that some people get very flushed skin when they take this medication.": Flushing is a common side effect of niacin, especially when starting the medication. This is due to vasodilation and can be uncomfortable, but it is usually not harmful. C. "You're likely to have some nausea when you begin taking the drug, but this will dissipate with time.": Nausea is not a primary or common side effect of niacin, and while some people may experience mild GI symptoms, it is not as concerning as flushing. D. "It's important to avoid eating shellfish and to tell providers before having any diagnostic imaging tests.": There are no specific concerns about shellfish consumption or diagnostic imaging tests related to niacin. This advice pertains more to other medications like those that affect iodine sensitivity.