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Antidepressant Medications Introduction Depression is a psychological condition that changes how people think and feel, and also affects social behavior and sense of physical well-being. Depression is the most common and most serious mental health problem facing people today. While it is normal to experience feelings of sadness every now and then, depression occurs when these feelings last for long periods of time. For example, for several weeks to several years but this is considering if it is left untreated. Depression interferes with a person’s ability to function well through out the day or even to have the motivation to get out of bed in the morning. No person is immune from depression it occurs in people of all social classes, all countries, and all cultural settings. About half of all cases of depression are unrecognized or untreated. There are many different symptoms caused by depression, some of them are sad mood, sleep problems, appetite change, concentration loss, suicidal thoughts, anxious, empty mood, feelings of hopelessness, pessimism, feelings of guilt, worthlessness, helplessness, loss of interest or pleasure in hobbies and activities that were once enjoyed, including sex, decreased energy, fatigue, being "sl