I have this medicine for over a year, left overs from my last bladder infection. Now I have a bladder infection again and it's very painful and keeps me running to the bathroom. I took my first doses about three hours ago and I'm supposed to take 1 twice a day. Can I take a second doses already now or do I really have to wait another 9 hours? Not sure, if my doctor told me, that I can take two in the beginning and then reduce to one doses every 12 hours. I am really in pain and I'm peeing blood :(