<qa>  What isoniazid and contaning rifampicin are used to treatLondon: HIV-1 infected patients without tuberculosis infection on established treatment with a combination based on 600 mg efavirenz dose Kampala: Patient with both HIV-1 and tuberculosis infection being treated with 600 mg efavirenz combination for HIV AND undergoing TB treatment with a dual therapy regimen contaning rifampicin and isoniazid 