UTI is not caused by drugs. All symptoms are documented in drugs trials even a runny nose, hiccups etc. UTI is caused by bacteria. Urinary retention + MS = UTI is very common for MSers.

I take Rebif and although it doesn't cause UTI, it is a factor in my getting UTI's very often. I have even had a few kidney infections. What you need to do is drink a lot more water and take cranberry vitamins, 2 pills 3 times a day. Also don't drink sugary drinks or eat too much sugar. 1-2 cookies and no soda per day is the best way to go. Since I have been taking these measures I have seen a difference.
Drugs that lower your immune system can cause you to have more infections including UTIs. After seeing a urologist many times, his conclusion was that it was my Rebif. Taking a low dose anti-biotic was his suggestion but I decided to try my own way since taking anti-biotics all the time is really not good for you.

Yes==UTI's are common for MSers. I've started taking a Cranberry supplement twice a day and haven't had one since.

I am on profolactive antibiotics for over 10 years. I have urinary retention and cath 2x daily or PRN. The antibiotics are changed every 6 months. I have tried to go off but bam UTI ! It's scary because of these superbugs. I know someday I will be in big trouble. :(

to help stave off UTI's I drink at LEAST a litre of water a day