[PREFACE- I've already asked this on Health.SE, but I've drawn a blank there. The place is practically deserted. Also, this is NOT a personal medical question; I'm simply trying to understand the difference between the two classes of drugs.]
I've recently come across two terms "Anxiolytic drugs" and "Anti-depressant drugs". I wanted to know how they differ from each other; if they do.
I mean, sure, "anxiety" isn't the same as "depression" but do the effects of these drugs differ widely?
For example [And this is just an example];
Chlorodiazepoxide is classified as an anxiolytic drug, while Phenelzine is classified as an anti-depressant. Say I had a patient A who's been prescribed Chlorodiazepoxide; patient B has been prescribed Phenelzine by a different physician. Barring possible allergic reactions, or some kind of known sensitivity to either drug, could they possibly take each other's medication and hope for more or less, the same effect? As in; A takes Phenelzine, but B takes Chlorodiazepoxide. [I just cooked up that example, only to see the difference between the two classes of drugs]
To make myself clear, I reiterate:
I would like to know if the two classes of drugs (anti-anxiety and anti-depression) are the same or not. If not, mentioning how the chemistry behind the action of each of the two types of drugs differ would be appreciated.