I second everything SWOT writes.
You have asked for specific information about medication and their side effects, which no one can responsibly give you. Each medication, as you know, acts differently depending upon individuals' characteristics. Your son is uniquely himself, as is his situation. Information about a side effect of a specific medication is best addressed by your son to his physician, unless there is a compelling reason your son and his physician cannot communicate independently.
It is this issue that you do not specifically address, that which many of us have come to believe is the crucial and central one.
Of course there are reasons for a 22 year old adult to live a life dependent upon their parents.
But even in cases that are borderline, where the parent fears that the adult child lacks competency, or has impaired judgment, or chronic illnesses, where the parent feels the child needs protection, are not always clear cut.
It may be helpful or not, for me to share our situation. You decide. Our sons do share some symptoms in common. My son was diagnosed ADHD when quite young.
A major mistake I made was to continue to seek control of major and important areas of my son's life, after he was an adult. And I tried and tried to do so until he was 26 years old.
My son is mentally ill, has poor judgment, has a chronic illness requiring treatment. Still, I have come to believe that he is better off making his own decisions about medication, housing, money, treatment, etc.
Do I suffer? Yes. Do I worry? Of course. Do I doubt myself? All the time.
But I have come to accept two things, important things, to me:
Trying to assert control over my son led to greatly increased conflict between us. Trying to achieve control led to my making my son wrong, led to power struggles between us. As I look back on it, when I did too much for him, and sheltered him, he was more anxious, more angry, more depressed, in general, more symptomatic. This, I realized, was completely against what I wanted.
Second thing. For my son to mature, to grow, to change...is he not entitled to live and learn from the gains and losses of his life? Could I decide that he was not? No. I could not. I came to accept that my son deserved a life of self-determination, not one dictated by and determined by his mother's goals or needs.
Your concern is the anger, depression and anxiety of your adult son. Forgive me if I respond without essential information. Of course, my perspective is based only on my own experience, my own situation.
One reason that our children can be depressed and anxious, is because of barriers to their fully participating in constructing their own lives. At once they fear and want independence and autonomy. On some level, too, they still need us. This creates conflict, and with it the symptoms you describe. Of course, there can be other reasons, too.
My son is happier, more involved and has more pride in himself, when he can and does make decisions himself that improve his life. And when his decisions are poor ones, he has the opportunity to make better ones. And he does.
He likes himself better. He is less anxious. He is less depressed. He is less self-conscious.
When I get out of the way, he grows.
I apologize if in my post I have gone places you had not asked to go. Because I am new at this way of thinking it is helpful for me to clarify where I have been and what I need to do.
Of course, none of this, not one bit, may apply to your situation. But it does to mine.
I look forward to knowing you better. I hope you post more.