It made my joints hurt so bad and the hot flashes (which will go with all of the estrogen blockers) that I finally changed to letrozole. The hot flashes are horrible, but taking 800 mg of magnesium has helped. I do have what they call trigger finger with the letrozole which is a normal side effect. The meds seem to make your body feel like a flu system at times. I’d go off of it if I weren’t so afraid of getting the cancer back.