Which of the following is a reportable adverse event according to the Philippines’ national policy?

Hypokalemia is considered a reportable adverse event according to the Philippines' national policy for several reasons. First, it is a significant electrolyte imbalance that can have serious health consequences if left unmonitored or untreated. Hypokalemia can lead to critical issues such as cardiac arrhythmias, muscle weakness, and respiratory failure, which necessitate timely medical intervention.

The national policy focuses on monitoring adverse events that could impact patient safety and treatment outcomes. This is crucial in the context of tuberculosis treatment, where medications can sometimes lead to complications that must be carefully tracked to ensure the well-being of patients.

On the other hand, the other conditions listed, such as gynecomastia, headache, and mild dizziness, while they can affect patient comfort and experience, are generally not classified as immediate health threats that require mandatory reporting due to their less severe nature compared to hypokalemia. Therefore, hypokalemia stands out as an adverse event that needs to be reported for effective monitoring and management within the national tuberculosis control framework.