Thanks for posting your query.
Your friend is suffering from Koch's chest and he has to take ATT for a defined period of 6 months.
When a patient develops Tubercular lesion in lungs, patient may have cavity inside his/ her lungs.
Cavity may have Rasmusen's aneurysm
from which blood may come during coughing.
This is a common phenomenon.
He must continue ATT with the prescribed dose and also take Tranexemic acid with ehtamsylate for control of bleeding.
This condition may occur after completion of ATT with declaring cured.
In such cases, there is no need of repeat of ATT.
If bleeding is not controlled by medicines then your friend may need surgery.
Dr. Mayank Bhargava