The monoamine theory of depression

What is the monoamine theory of depression?What evidence supports this hypothesis as a cause of

affective disorder?It generally takes 2-3 weeks of chronic treatment before an antidepressant begins to

have a clinical benefit, yet the drug’s pharmacological effect (for example, its inhibition ofMOA, or

reuptake) is immediate.What synaptic mechanisms may underlie this time lag?