6. Women of child bearing potential must agree to use adequate contraception (e.g. oral contraceptives, intrauterine device, double barrier methods), if sexually active. Depo Provera is acceptable if it is started 3 months prior to enrollment. If hormonal contraceptives are used, participants must also agree to use a backup method of birth control. They will also need to understand the risks of lithium and other study treatments to the fetus and infant.