Do some medication for mental illness makes you dumb ?

Depends. Take schizophrenia for example. Schizophrenics are given drugs to dull the mind when they are given psychotherapy, so that it is easier to 'cure' them. Because the mind is dulled, the schizophrenic loses some creative thought and illusions that go with their mental illness. Does this lack of creativity make them dumber?

My answer: Yes for 'some' medications.

I'm a schizo, and my shots are to control overproduction of some chemicals my brain produces to control my hallucinations and paranoid behavior. They don't dull my brain, they actually make me sharper in a strictly quantitative sense, because without the distractions I can pay attention to detail and follow logical thought patterns.
There's a lot of hype about the 'creative' nature of the mentally ill, but the expression is really just an outlet for unimaginable amounts of emotional pain. It's not a wonderful thing.
The attitude that health professionals are trying to drug people like me into submission so we'll go away is extremely harmful, because it creates a fear that keeps people who could really use some help from seeking it. Medication definitely doesn't always work for everyone, but it makes things better for a lot of us.

I don't know if that's true or not. But what I do know is that I'd rather be medicated and dumb than unmedicated and miserable.

Some can numb the mind, make it hard to think a lot. Others can genuinely help.

A lot of medication has the effect of stunting growth as well as ruining the development as its altering a childs chemistry as they are still growing. So you might say you are ruining the childs cognitive ability and making them socially retarded.

I used to have to take a very heavy dose of anti-psychotics a few years ago. It did make me dumb, passive, submissive, and totally killed my creativity and imagination. Now that I don't take it im back to normal and way more aware or things.

Yeah

I heard pills can make you slow , mentally speaking .

They're trying to corrupt us. Dumb us down. Bricks in my wall will stay glued! FUCK EM'!