Just as there are over 256 ways to wash dishes, no method being right or wrong, there is also more than one way to manage mental illness. As conditions and degrees in patients with mental illness vary drastically, what is to be considered proper care for one individual simply may not work with another.
With that said, it is my truest belief that medication for those in need is always proper when the recipient is in harmony with and willingly accepts that type of treatment. Those grappling with issues of Mental illness whose belief systems allow the use of pharmaceutical medication to be of assistance in managing the condition are helped by it. For many grappling with mental illness, thinking positive is next to impossible and asking someone in the throws of depression to exercise and eat right is not a realistic solution because the perception of the souls purpose is so badly distorted.
In many cases, social pressures and individual judgments prevent those in need of medical relief from accepting it. All chronic depressions become somewhat "Chemical". The emotions that feed depression will impact the brain's chemical balance. People who have bitterness, resentment, chronic low lying anger issues, are always more prone to depression, because those things can deplete Serotonin. This generally means that many people with depression will need medications for a time because prolonged depression impacts the chemicals in the brain.
I am not in favor of long term mind altering medication to dull the senses. I do, however, believe when someone feels relief from anguish and pain as a result of receiving endorphin boosts and they subsequently become productive and able to fulfill their life's work, medication is a good choice.