Welcome to Health care Magic,
Please do not worry this answer is absolutely free to you ,now to your query your brother is suffering from abdominal tuberculosis
and taking treatment for it, as surgery is advised to him there must be some stricture formation due to which there is intestinal obstruction
If intestinal obstruction is there then it needs surgery and can not be corrected by medicines.
Your surgeon can confirm it by plain X ray, Ultrasonography
, and CT scan
or MRI of abdomen.
He should go for surgery and then if any part is removed or biopsy
may be taken for histopathology.
If it is possible to isolate TB ( AFB) it would be great to have culture and sensitivity to gude about drugs to be taken.
If not then Suitable drugs out of first line and second line drugs may be given and he can be treated accordingly.
He should take high protein and high calories diet to have weight gain along with vitamins and anti tubercular therapy.
Please take care