As you'll probably learn as you advance through treatment, you want to avoid any illnesses if you can. It takes a long time to recover and it can weaken you. So a flu shot is a great idea.
You know, when I started out, I figured there were all sorts of issues with drug interactions. But there don't seem to be an extraordinary number. I take all kinds of other stuff – like antidepressants and antibiotics – and my treating physician doesn't seem to be concerned.
I think it is recommended that you get a flu shot, my understanding is tx can lower your resistance.
i to a flu shot while on tx