A Study of Flibanserin in Breast Cancer Survivors on Tamoxifen or Aromatase Inhibitors

Inclusion Criteria: * Women age 21 and older * Able to swallow tablets * History of stage 0-III breast cancer that is estrogen and/or progesterone receptor positive * History of breast cancer with no current evidence of disease and have completed primary treatment with any combination of surgery, radiation and/or chemotherapy at least 3 months ago and is currently on Tamoxifen, an AI, or ovarian suppression. * Has been taking tamoxifen, an AI, ,or ovarian suppression for at least 3 months. * Has LFTS within 2 times the upper limit of normal proven by a Comprehensive Metabolic Panel (CMP) performed within 6 months of protocol enrollment and while the patient was on Tamoxifen, an AI, or ovarian suppression * Patients meet criteria for the diagnosis of HSDD as defined by the DSM-IV and ISSWSH Consensus paper. The criteria states that there must be a decrease in sexual desire and this must be a change for at least 3 months from what it was previously. Personal distress resulting from this change must occur. Initial screening will take place with The Decreased Sexual Desire Screener, a 5-question screening tool developed and validated to aid clinicians in making the diagnosis of HSDD. A "yes" response to the first 4 questions on the screener is consistent with HSDD. * Patients must agree to follow the guidelines for alcohol consumption during the 24 weeks of treatment on study * English speaking * Able to participate in the informed consent process Exclusion Criteria: * Active secondary cancer requiring cytotoxic chemotherapy * History or current diagnosis of metastatic breast cancer. * Unwillingness to follow alcohol guidelines while taking flibanserin * Hepatic dysfunction (more than 2 times the upper limit of normal for alt, ast, t.bili or alk phos) proven by Comprehensive Metabolic Panel (CMP) performed within 6 months of protocol enrollment and while the patient was on Tamoxifen or an AI * Patients on strong CYP3A4 inhibitors including ketoconazole, itraconazole, posaconazole, clarithromycin, nefazodone, ritonavir, saquinavir, nelfinavir, indinavir, boceprevir, telaprevir, telithromycin, conivaptan * Patients on moderate CYP3A4 inhibitors including Amprenavir, atazanavir, ciprofloxacin, diltiazem, erythromycin, fluconazole, fosamprenavir, verapamil, grapefruit juice * Non-English speaking * Unable to participate in the informed consent process