Tom Cruise explains it all

Hearing a Scientologist claim that anything is a "pseudo science" is just laughable. I suppose if you're inclined to take medical advice from a cult-pushing actor with no medical background, you'll probably get what you deserve though.

Cruise: No, you see. Here's the problem. You don't know the history of psychiatry. I do.
Lauer: Aren't there examples, and might not Brooke Shields be an example, of someone who benefited from one of those drugs?
Cruise: All it does is mask the problem, Matt. And if you understand the history of it, it masks the problem. That's what it does. That's all it does. You're not getting to the reason why. There is no such thing as a chemical imbalance.
[...]
Cruise: Matt. Matt, Matt, you don't even — you're glib. You don't even know what Ritalin is. If you start talking about chemical imbalance, you have to evaluate and read the research papers on how they came up with these theories, Matt, okay? That's what I've done. Then you go and you say where's the medical test? Where's the blood test that says how much Ritalin you're supposed to get?
[...]
Lauer: But you're now telling me that your experiences with the people I know, which are zero, are more important than my experiences.
Cruise: What do you mean by that?
Lauer: You're telling me what's worked for people I know or hasn't worked for people I know.  I'm telling you, I’ve lived with these people and they're better.
Cruise: So, you're advocating it.

Dude, when Entertainment Weekly can point out that you're talking out of your ass... (It seems they fact-checked some of his claims. Heh.)