Desvenlafaxine
"My doctor recommended this for my pre-menopausal symptoms as well as anxiety.  At first I was thrilled with the results but about 3 months into it I realized the insomnia was not worth it.  I have sleep apnea so this medication was not a good choice for me. My doctor increased the ambien dose and that wrecked havoc with my system.  I have stopped taking both and hope to feel better soon."