Featured: isoniazid, Nydrazid (discontinued), Laniazid (discontinued), INH (discontinued) Main Article

Isoniazid (Nydrazid [discontinued], Laniazid [discontinued], INH [discontinued]) is a medication prescribed to prevent active tuberculosis (TB) in individuals who have an abnormal skin test for TB, and is used in combination with other drugs to treat active TB. Side effects, drug interactions, and pregnancy safety should be reviewed prior to taking this medication.