As Jacob said, Tendonitis is characterized by chronic inflammation induced by specific joint overuse. While Cissus Q., has great analgesic effects, as he mentioned as well, its reparative properties have not been noted to be complete this soon in any of our credible research; unless the company in question has research to the contrary.
To the OP, Jacob is exactly right; you need to eliminate the destructive movement in order for Cissus' steroidal action to block the pro-inflammatory cytokines at work. Think of it like a dam with a tiny pinhole in it. By simply dosing Cissus and not ceasing the movement, you are merely placing your finger in the dam, treating a symptom only to have the dam explode later. By removing the movement(s) which induced this issue in the first place, you are allowing Cissus to repair the dam as a whole, repairing its previous functionality, and, possibly, surpassing that.