My friend wants to take whitening capsule (metathione glutathione), but then she's bothered because she's currently taking anti TB drugs.. is it OK if she take whitening capsule while taking anti TB drugs @ the same time?

She should ask her doctor about this. Answering this particular question here could be dangerous to her health as we don't know why she is taking the TB drug (did she have TB or just merely exposed to it). We don't know which TB drug she is taking as there are 3 main drugs prescribed for TB and they all work differently with different side effects.

Please tell her to ask her doctor if this is okay for her.