For close contacts of patients with pulmonary TB, apart from the 9 month isoniazid treatment, 4 months of daily rifampicin can be used if close lab monitoring is available or 2 months of treatment with rifampicin and pyrazinamide (watch out for hepatotoxicity) or 3 months of isoniazid and rifampicin are other options.
But note the strong association of rifampicin resistance and isoniazid resistane, implying that the bacteria may be resistant to rifampicin too.