Just asking if anybody has had bad side effects from BCG instillations. I have had 14 instillations over the last 18 months or so and it has given me what they term as chemical cystitis. I have pain and discomfort (mostly mornings) every day. I'm due for another scope this week, my last one was in December and I was clear, thankfully. But I have had this for a few months now, even before the last check. I,'m assured it will go on its own accord but takes a heck of a time. I find it quite debilitating and limits what I do. Be good to hear from anyone out there suffering the same. BTW I live in the UK but we have the same procedures as the N American population.