I have had sciatica pain in the past but no more, probably because I started doing exercises specifically designed to attack the problem. There are many such exercises on the internet, but I chose the easiest, since I'm almost 85 years old and a longtime sufferer from painful arthritis.
People are always cautioning against ANY exercise while suffering from PMR, but I have found the opposite to be true. I've been lowering my dose for over a year and am now at 2 mg. No sciatica for ages.
Much luck to you, and Happy New Year--