FDA Section 4 \u2022 who must NOT take this
Isoniazid - Contraindications
These conditions, allergies, and situations mean Isoniazid should NOT be used. From the US FDA-approved drug label Section 4.
CONTRAINDICATIONS Isoniazid is contraindicated in patients who develop severe hypersensitivity reactions, including drug-induced hepatitis; previous isoniazid-associated hepatic injury; severe adverse reactions to isoniazid such as drug fever, chills, arthritis; and acute liver disease of any etiology.