I had problems working out when also. I was swapped from ethambutol to clofazimine because of side effects. Az, Rif, I take on an empty stomach at 6am before breakfast then wait 2 hours eat breakfast and take clofazimine with the food. I will say I found what I ate could affect any reaction. A bowl of bran flakes with banana and milk seemed to work for me. Also though now I’m into my 5th month so body adjusting not so much stomach pain. Then I take a good probiotic supplement around 4pm. I eat yoghurt after dinner either a spoon of Manuka honey mixed in. This seems to work for me but again we are all different! Good luck in finding what works for you!