Just saw this, hope your feeling better Susie! I've been on the radioactive pills before. Didn't stain my panties though.... Didn't get any weewee on em I guess! They didn't make me feel sick either. I unno. Last time I had a UTI I actually caught it pretty early so I chose to not get thoes, just the anti-biotic. The first time I had one I thought I was going to go crazy and they sure helped!