Suggest Treatment For Prostatitis

I am facing the problem of burning sensation, frequent urniation at the tip of pennis.
consulted the doctor, he gave the treatment for prostatitis. I have used those antibatics for about 3 weeks. still i am facing the same problem.No burning sensation while urniating..but after some time i feel the sensation. While errction also i am facing this burning problem. How many days it will take to cure it..pls sugges me...i am 29 years old.