After CABG I had pleural effusion on the left side of my chest. All tests including Quanty feron gold test and biopsy on the left inside of the chest showed negative results for TB. Now I am having ankylosing Spondylitis for which biologic injection Scapho is being given. Since my Mantoux test was positive, on the suspicion that I may be having latent TB, I was asked to take R Cinex 300/600 tablets for 4 months. I have taken RCinex for 2 months and thereafter because of stomach trouble I switched over to Isoniazid 300 tablets and took them for 4 months. Is this medication sufficient for the latent TB and can I stop the medication now. In 2002 because of eridocyclitis in the eye on suspicion of having TB I had taken full course of TB medicine ie. AKT4 for 9 months. Please advise. Thanks.