With the help of an example,explain how do tranquilizers control the feeling of depression?

(N/A) Tranquilizers are a class of chemical compounds used for the treatment of stress,and mild or even severe mental diseases. For removing depression and to boost the mood,specific types of tranquilizers known as antidepressants are used.
These drugs inhibit the enzymes which catalyze the degradation of the neurotransmitter noradrenaline.
As a result,the concentration of noradrenaline increases,and it is slowly metabolized,allowing it to activate its receptor for longer periods.
An example of such an antidepressant is $Iproniazid$ or $Phenelzine$.