Why is monitoring liver function important for patients taking INH?

Monitoring liver function is critical for patients taking isoniazid (INH) primarily because INH is metabolized in the liver, and improper metabolism can lead to toxicity. INH has the potential to cause liver damage, especially in individuals with pre-existing liver conditions or those who consume alcohol. Regular assessment of liver function helps identify any elevation in liver enzymes that could indicate hepatotoxicity, allowing for timely intervention and adjustment of treatment as needed.

While the other aspects mentioned, such as evaluating treatment effectiveness, checking for allergies, or assessing mental health, are important in the comprehensive management of a patient, they do not directly relate to the specific risks associated with INH and its metabolism in the liver. Therefore, the focus on liver function monitoring underlines the importance of preventing potential adverse effects and ensuring the safety of the patient during INH therapy.