Which symptom noted in a client taking naproxen sodium may indicate a serious adverse reaction?

The identification of stomach pain as a potential indication of a serious adverse reaction in a client taking naproxen sodium is critical. Naproxen sodium is a nonsteroidal anti-inflammatory drug (NSAID) that can lead to gastrointestinal issues, including peptic ulcers and gastrointestinal bleeding. Stomach pain may be a sign of irritation or damage to the stomach lining, which can become serious if left unaddressed. This symptom calls for immediate attention, as severe gastrointestinal complications can lead to more serious health outcomes.

In contrast, while increased thirst, itchiness, and headaches can occur with naproxen use, these symptoms are often less directly associated with severe reactions when compared to gastrointestinal distress. Increased thirst may indicate dehydration or other non-specific causes, itchiness might suggest an allergic reaction, and headaches can be a common and less severe side effect. Nevertheless, stomach pain can signal a serious gastrointestinal issue that requires prompt evaluation and management. Thus, it is crucial for healthcare providers to monitor for this specific symptom when a patient is prescribed naproxen sodium.