 all participants will be administered panss, sans, esrs, calgary, progesterom, sexual functioning scale, ham-a, covy, hamilton depression scale, and cgi and cgi improved rating on the first visit, as well as blood tests, ecg and weight. they will then be tested using a computer cognitive test cogscan test that lasts about 45 minutes. next, they will be given either a two week dose of placebo or treatment 2 mg 2 daily for first week, then 4 mg. day, 2 mg. night for the second week. after two weeks they the dose is increased to 4 mg. 2 daily. at four weeks all tests are readministered, as well as at six weeks. the study is concluded at 6 weeks, following a readministration of tests. physical examination is also administered at the conclusion. 