I have bronchitis and a sinus infection and have been taking antibiotics since Wednesday 1/16, so I have about another week to go. I haven't been taking Alli since then. Now, I told the doctor that I was taking it, and he didn't have any concerns. But I was thinking...if Alli sucks out some of your needed Vitamins, will it take the efficacy away from the antibiotic? Anyone know? Any feedback appreciated.