Flibanserin, marketed under the brand name Addyi, is a medication used to treat hypoactive sexual desire disorder (HSDD) in premenopausal women. It's available in 100 mg tablets. HSDD is characterized by a persistent lack of sexual desire or interest, causing distress or interpersonal difficulty. Flibanserin works by affecting certain neurotransmitters in the brain, specifically serotonin and dopamine, which are involved in regulating sexual desire.