A Doctor I Just Saw About 5:30p.m. For A Bladder

A doctor I just saw about 5:30p.m. for a bladder infection gave me a prescription for this that would have cost me $300 which I did not have. It was bad she said. Also had a little blood in urine. I did not get presc. filled and will go back Tues. for Cipro which I have taken before. In the mean time I am in pain and wondered what I could take. I have some Cephalexin which I took when I had fall that injured mouth and lip. Would this help? I just had no idea what she ordered was not on my drug plan.