What Are the Symptoms of Depression?
For major depression, you may experience five or more of the following for at least a two-week period:
Persistent sadness, pessimism
Feelings of guilt, worthlessness, helplessness or hopelessness
Loss of interest or pleasure in usual activities, including sex
Difficulty concentrating and complaints of poor memory
Worsening of co-existing chronic disease, such as rheumatoid arthritis or diabetes
Insomnia or oversleeping
Weight gain or loss
Fatigue, lack of energy
Anxiety, agitation, irritability
Thoughts of suicide or death
Slow speech; slow movements
Headache, stomachache, and digestive problems
http://en.wikipedia.org/wiki/Major_depressive_disorder
Treatment resistant depression
Postpartum depression (puerperal psychosis)
Pharmacologic Intolerance: hypersensitivity to drugs side effects (weight gain, decrease in libido or Decreased sex drive, Tremors, Dry mouth)