Final answer:
Healthcare providers should monitor for signs of Hepatitis, such as jaundice and elevated liver function tests, when administering the anti-tubercular drug isoniazid (INH).
Step-by-step explanation:
When administering anti-tubercular drugs such as isoniazid (INH), healthcare providers should assess for signs of Hepatitis (jaundice, elevated liver function tests). Isoniazid is known to cause hepatotoxicity, and the risk of liver damage is increased with concurrent alcohol use. It is critical for healthcare providers to monitor liver function regularly to detect any early signs of liver injury.