What is known about the use of ketamine in treatment of depression? would it be a good maintenance medication, or more for severe depressive episodes?

Ketamine ; MDD: Some studies are available showing that IV ketamine given in highly specialized clinics can offer rapid relief in severe, treatment-resistant depression, such as: http://tinyurl.Com/l76qma8 however, problems remain in that the beneficial results may not last more than a few days. Some cities have such clinics. It would not be a maintenance medication that someone could use at home.

not at this time: The use of ketamine to treat depression is in its infancy and being studied. Showing great promise but not avaiable as an everyday treatment for depression.