I would suggest you to take a second opinion in a DOTS center located in every town of India near a TB and chest specialist.
In resistant tuberculosis we prescribe the use of ofloxacillin and steptomycin along with 4 drugs for 2-3 months followed by 2 drugs for 6-7 months. If this is not resistant then ofloxacillin and steptomycin is not necessary. Complete clinical history and the immune state of your father is important so after clinical and diagnostic correlation his orthopedician might have prescribed him.
If he has resistant and consistent tuberculosis then the reason for this prescription can be substantiated.
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