If you are taking tamoxifen, be sure to avoid any medications that interfere with its effectiveness.

A test to measure CEP17 can help physicians choose the most effective chemotherapy to improve a patient’s chances of survival. Chemotherapy has very unpleasant side effects, and choosing the most effective chemotherapy the first time helps patients fight cancer more quickly.

New research shows that taking the antidepressants paroxetine (Paxil is the brand name) or fluoxetine (Prozac is the brand name) while taking tamoxifen can increase risk of death from breast cancer.