Hi, John. If you're taking a probiotic for the first time (or a new brand for the first time), it can take a few weeks for your gut to become acclimatized to the good bacteria. The gas you're experiencing could be the good bacteria re-populating your gut, a good sign, I think! It should resolve itself. I took Florastor for a few months shortly after my reversal and it helped, and I do remember some minor issues while my insides adjusted. I don't take probiotics anymore because everything is okay. I do have gas if I have eaten carbohydrate heavy food (pasta, croissant, etc.). Be patient.