A nurse is assessing a client who has schizophrenia and is taking aripiprazole. The nurse should notify the provider of which of the following findings?

A. Insomnia While insomnia can be a side effect of aripiprazole, it is generally not a reason to notify the provider unless it becomes severe or chronic. Other interventions can be tried to manage sleep disturbances. B. Muscle stiffness This is a concerning symptom, as it may indicate extrapyramidal symptoms (EPS), such as akathisia or dystonia, which are serious side effects of antipsychotic medications like aripiprazole. Muscle stiffness may also indicate neuroleptic malignant syndrome (NMS), a life-threatening condition that requires immediate medical attention. Therefore, this finding should be promptly reported to the provider. C. Weight gain of 5 lb in 1 month Weight gain can occur with many antipsychotic medications, but a gain of 5 pounds over one month is generally not alarming unless it becomes more significant over time. The nurse should monitor the client for further weight changes, but it is not an urgent concern in this instance. D. Constipation is a common side effect of many medications, including antipsychotics like aripiprazole. While it should be addressed to prevent complications (such as impaction), it does not require urgent intervention unless the symptoms become severe or result in bowel obstruction.