Nausea and vomiting symptoms are maximum on starting anti-tubercular medication and then they gradually reduce.
Keep monitoring LFT regularly, especially in first few weeks of medication.
Don't remain empty stomach for too long after the early morning capsule containing Rifampicin. 30 minutes gap is sufficient.
Encourage small frequent meals including fruits, juices, custard, etc.
Needs anti-vomiting medication including domperidone/metoclopramide/ondansetron initially if vomiting is more.
Your doctor can add any of these above medication and an antacid.