I've had the stabbing pains in the biceps with my PMR before I got on prednisone. I'm always looking for symptoms when I taper that are unlike anything I have had before and that is one of them. With my last flare it was stabbing pains under my shoulder blades, and chest muscles so tight that it hurt to take a deep breath. I am making my third attempt now to taper below 10 mg of prednisone. My main conclusion so far is that trying to "tough it out" through pain after a drop in dosage does not work. Symptoms just get worse. My MD has instructed me to stay at 9 mg for 3 weeks, then at least 4 weeks on 8mg. He will check my labs before I go lower.