Final answer:
Sedation is the assessment finding that would indicate an adverse reaction to methyldopa. Hyperkalemia, palpitations, and nausea are not commonly associated with methyldopa.
Step-by-step explanation:
The student has asked which assessment finding would indicate that a client may be having an adverse reaction to methyldopa. Among the options provided, sedation is a common adverse effect of methyldopa. The other options are not commonly associated with this medication. Methyldopa is an antihypertensive medication that can cause central nervous system effects such as sedation or drowsiness. Therefore, if the client exhibits signs of sedation after taking methyldopa, it could indicate an adverse reaction to the medication. It is important for the nurse to monitor the patient's vital signs and report any concerning symptoms to the healthcare provider.