Why Did My Dr Say That Brufen Retard Was No

why did my dr say that brufen retard was no longer used. imhave feom time to time and that uswd to be the only pain killer that works. i was also told to use i rufen instead of diclofenac for my knee on which I have had an artheoscopy, and diclofenac although taking longer to be effective, eases any pain of arthritis in the knee, no good on the neck though.

we are at the mercy of drs say so.