Hello, First, don t worry. Tuberculosis and rheumatoid arthritis both can coexist. If TB is not multidrug resistant then only a few TB medicines are prescribed. Drug interactions can occur but it may be minimal. According to books person having pulmonary tuberculosis shouldn t be prescribed steroids but in your case for rheumatoid arthritis steroids might be prescribed. Reason for not prescribing steroids in TB patients is because steroid decrease immunity and TB patients need good immunity for fighting with TB bacteria. You have not given enough information regarding TB category and ongoing treatment of both diseases. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Divyesh Sondarva